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Direct Salinity Effect on Absorbance and Fluorescence of Chernozem Water-Extractable Organic Matter Aquat. Geochem. (IF 1.6) Pub Date : 2024-02-24 Vladimir A. Kholodov, Natalia N. Danchenko, Aliya R. Ziganshina, Nadezhda V. Yaroslavtseva, Igor P. Semiletov
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Solid-liquid Equilibria (SLE) of the System Containing the Sulfates of Lithium and Potassium at 303.2 and 318.2 K Aquat. Geochem. (IF 1.6) Pub Date : 2024-02-04
Abstract The solid-liquid phase equilibria of aqueous system containing the sulfates of lithium and potassium (Li2SO4 + K2SO4 + H2O) at T = 303.2 and 318.2 K were done by isothermal dissolution method. The phase equilibria data (solubility, density, and refractive index) of the system were determined experimentally. The corresponding solid-liquid phase diagram, density/refractive index versus composition
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Short-Term Spatiotemporal Variability in Seawater Carbonate Chemistry at Two Contrasting Reef Locations in Bocas del Toro, Panama Aquat. Geochem. (IF 1.6) Pub Date : 2024-02-03
Abstract There is growing concern about the effects of ocean acidification (OA) on coral reefs, with many studies indicating decreasing calcium carbonate production and reef growth. However, to accurately predict how coral reefs will respond to OA, it is necessary to characterize natural carbonate chemistry conditions, including the spatiotemporal mean and variability and the physical and biogeochemical
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Elemental Variations and Mechanisms of Brines in the Context of Large-Scale Exploitation: A Case Study of Xitaijnar Salt Lake, Qaidam Basin Aquat. Geochem. (IF 1.6) Pub Date : 2023-12-20 Zhanjie Qin, Qingkuan Li, Wenxia Li, Qishun Fan, Tianyuan Chen, Chan Wu, Jianping Wang, Fashou Shan
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A Study on Ikaite Growth in the Presence of Phosphate Aquat. Geochem. (IF 1.6) Pub Date : 2023-11-17 Samuel B. Strohm, Giuseppe D. Saldi, Vasileios Mavromatis, Wolfgang W. Schmahl, Guntram Jordan
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Effect of Ionic Strength on H2O and Si-Species Stability Field Geometry in pH-Eh Space Aquat. Geochem. (IF 1.6) Pub Date : 2023-11-03 Samuel Bowman, Arkajyoti Pathak, Vikas Agrawal, Shikha Sharma
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Spatial Variation and Influencing Factors of Optical Characteristic of Water Extractable Organic Matter in Soils of Urban Grassland Across Climatic Zones in China Aquat. Geochem. (IF 1.6) Pub Date : 2023-09-09 Baozhu Pan, Siwan Liu, Yitong Ding, Ming Li
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Occurrence, Chemical, and Pb-isotopic Composition of Uraninite: A Verification of the Effective Source of Uranium in a Granite Aquifer of the Daejeon Area, South Korea Aquat. Geochem. (IF 1.6) Pub Date : 2023-06-20 Jeong Hwang, Keewook Yi
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Temporal and Seasonal Variations of Silicate Svratka River and Sediment Characterization, Czech Republic: Geochemical and Stable Isotopic Approach Aquat. Geochem. (IF 1.6) Pub Date : 2023-05-18 Tjaša Kanduč, Milan Geršl, Eva Geršlová, Jennifer McIntosh
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Geochemistry of Limestone from the Douala Sub-basin, Cameroon: Implications on Diagenesis, Depositional Environment and Paleotemperature Aquat. Geochem. (IF 1.6) Pub Date : 2023-05-02 Ndengwe Alexander Tangwa, Njoh Olivier Anoh, Nowel Yinkfu Njamnsi
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A New Water-Based 87Sr/86Sr Isoscape Map of Central and NE Germany, with Special Emphasis on Mountainous Regions Aquat. Geochem. (IF 1.6) Pub Date : 2023-03-16 A. Käßner, H. T. Kalapurakkal, B. Huber, M. Tichomirowa
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Predicting Coral Reef Carbonate Chemistry Through Statistical Modeling: Constraining Nearshore Residence Time Around Guam Aquat. Geochem. (IF 1.6) Pub Date : 2023-03-01 Heidi K. Hirsh, Thomas A. Oliver, Hannah C. Barkley, Johanna L. K. Wren, Stephen G. Monismith, Derek P. Manzello, Ian C. Enochs
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A Biogeochemical Alkalinity Sink in a Shallow, Semiarid Estuary of the Northwestern Gulf of Mexico Aquat. Geochem. (IF 1.6) Pub Date : 2022-12-22 Larissa M. Dias, Xinping Hu, Hang Yin
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Hydrogeochemical Processes of the Azigza Lake System (Middle Atlas, Morocco) Inferred from Monthly Monitoring Aquat. Geochem. (IF 1.6) Pub Date : 2022-12-13 Rachid Adallal, Hanane Id Abdellah, Abdelfattah Benkaddour, Christine Vallet-Coulomb, Ali Rhoujjati, Corine Sonzogni, Laurence Vidal
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Aggregation and Dispersion Behaviours of Riverine Trace Metals (Fe, Al, V, Mn, Ni, and Zn) and Organic Matter in Freshwater and Estuarine Conditions: A case study in Shira and Midori Rivers, Kumamoto, Japan Aquat. Geochem. (IF 1.6) Pub Date : 2022-11-27 Hiroaki Ito, Shinya Tsurumaki, Takehide Hama, Kei Ishida, Tsugihiro Watanabe, Luong van Duc, Yasunori Kawagoshi
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Microbial Acid Sulfate Weathering of Basaltic Rocks: Implication for Enzymatic Reactions Aquat. Geochem. (IF 1.6) Pub Date : 2022-09-29 Fatih Sekerci, Nurgul Balci
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Spatiotemporal Variations of Riverine CO2 Partial Pressure and its Effect on CO2 Flux at the Water–Air Interface in a Small Karst River Aquat. Geochem. (IF 1.6) Pub Date : 2022-09-13 Shengjun Ding, Zhongfa Zhou, Hui Dong, Lihui Yan, Liangxing Shi, Jing Huang, Heng Zhang
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Influence of Diverse Urban Pressures on Water Characteristics in a Small Eastern Mediterranean Watershed Aquat. Geochem. (IF 1.6) Pub Date : 2022-06-17 E. Maatouk, A. El Samrani, R. Sawan, R. Bou Ghosn Salameh, V. Kazpard, Z. Matar
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Fluid–Rock Interactions in Geothermal Reservoirs, Germany: Thermal Autoclave Experiments Using Sandstones and Natural Hydrothermal Brines Aquat. Geochem. (IF 1.6) Pub Date : 2022-05-31 Rafael Schäffer, Emilia Götz, Nils Schlatter, Gabriela Schubert, Sebastian Weinert, Stefanie Schmidt, Ute Kolb, Ingo Sass
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Geochemical Proxies and Mineralogical Fingerprints of Sedimentary Processes in a Closed Shallow Lake Basin Since 1850 Aquat. Geochem. (IF 1.6) Pub Date : 2022-02-13 Paola Gravina, Alessandro Ludovisi, Beatrice Moroni, Riccardo Vivani, Roberta Selvaggi, Chiara Petroselli, David Cappelletti
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A Late Holocene Record of Variations in the Chemical Weathering Intensity and Pedogenesis in a Lake Catchment from Southern India Aquat. Geochem. (IF 1.6) Pub Date : 2022-01-11 Kizhur Sandeep, Rajasekhariah Shankar, Anish Kumar Warrier
We investigated the detrital influx, chemical weathering intensity, provenance and pedogenesis over the past 2,500 years in the catchment of Pookot Lake, southern India. The down-core variations of metal/Al ratios (Na/Al, K/Al, Mg/Al, Ca/Al, Fe/Al, Mn/Al, Zn/Al, Ba/Al) of the Pookot sediments indicate changes in the rainfall-induced terrigenous inflow to the lake. In contrast, fluctuations in the chemical
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Oxygen Consumption of Resuspended Sediments of the Upper Elbe Estuary: Process Identification and Prognosis Aquat. Geochem. (IF 1.6) Pub Date : 2021-11-30 M. Spieckermann, A. Gröngröft, M. Karrasch, A. Neumann, A. Eschenbach
The resuspension of sediment leads to an increased release of nutrients and organic substances into the overlying water column, which can have a negative effect on the oxygen budget. Especially in the warmer months with a lower oxygen saturation and higher biological activity, the oxygen content can reach critical thresholds in estuaries like the upper Elbe estuary. Many studies have dealt with the
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Temporal and Spatial Variabilities of Chemical and Physical Parameters on the Heron Island Coral Reef Platform Aquat. Geochem. (IF 1.6) Pub Date : 2021-10-04 Samuel A. H. Kekuewa, Travis A. Courtney, Tyler Cyronak, Theodor Kindeberg, Bradley D. Eyre, Laura Stoltenberg, Andreas J. Andersson
Globally, coral reefs are threatened by ocean warming and acidification. The degree to which acidification will impact reefs is dependent on the local hydrodynamics, benthic community composition, and biogeochemical processes, all of which vary on different temporal and spatial scales. Characterizing the natural spatiotemporal variability of seawater carbonate chemistry across different reefs is critical
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Organic versus Inorganic Carbon Exports from Glacier and Permafrost Watersheds in Qinghai–Tibet Plateau Aquat. Geochem. (IF 1.6) Pub Date : 2021-09-18 Congrong Yu, Ying Li, Huijun Jin, Qiang Ma, Zhongbo Yu, Keliang Shi, Xiangying Li, Gang Chen
In a warming climate, land-to-water carbon mobilization is increasing in glacier and permafrost area. To identify the connection between exported river carbon content and the permafrost or glacier condition in the high-altitude mountain area, we studied the dissolved organic carbon and dissolved inorganic carbon concentration in three streams of Qinghai–Tibet Plateau (QTP), which were located in the
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Upwelling of Deep-seated Fluid in the Sikhote-Alin Region, Far East of the Eurasian Plate Aquat. Geochem. (IF 1.6) Pub Date : 2021-09-09 Nakamura, Hitomi, Iwamori, Hikaru, Morikawa, Noritoshi, Kharitonova, Natalia, Chelnokov, Georgy, Bragin, Ivan, Chang, Qing
Spring waters with high-pCO2 content are widely distributed in the Sikhote-Alin region in Russia. Mukhen spa is one such spring located in the northern Sikhote-Alin region. This spa has two types of upwelling spring waters and exhibits distinct chemical signatures. One of the springs originates from a shallow aquifer and features hydrogen and oxygen isotopic ratios of meteoric water with a high 3He/4He
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Carbonate Alkalinity Enhances Triclosan Photolysis Aquat. Geochem. (IF 1.6) Pub Date : 2021-07-06 Katie A. Albanese, Mrinal Chakraborty, Christopher M. Hadad, Yu-Ping Chin
Triclosan (TCS) is an antimicrobial compound found in many household products used across the world. TCS is not completely removed in wastewater systems, resulting in trace-level concentrations present ubiquitously in surface waters. The direct photodegradation of TCS has been widely studied, with results indicating that TCS breaks down to chlorophenols and dioxins. To date, no studies have specifically
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The Abiotic Nitrite Oxidation by Ligand-Bound Manganese (III): The Chemical Mechanism Aquat. Geochem. (IF 1.6) Pub Date : 2021-05-31 George W. Luther III, Jennifer S. Karolewski, Kevin M. Sutherland, Colleen M. Hansel, Scott D. Wankel
Given their environmental abundances, it has been long hypothesized that geochemical interactions between reactive forms of manganese and nitrogen may play important roles in the cycling of these elements. Indeed, recent studies have begun shedding light on the possible role of soluble, ligand-bound Mn(III) in promoting abiotic transformations under environmentally relevant conditions. Here, using
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Chemical weathering and carbon dioxide consumption in a small tropical river catchment, southwestern India Aquat. Geochem. (IF 1.6) Pub Date : 2021-04-28 Baby Krishnan Nisha, Keshava Balakrishna, Harikripa Narayana Udayashankar, Busnur Rachotappa Manjunatha
Studies done on small tropical west-flowing river catchments located in the Western Ghats in southwestern India have suggested very intense chemical weathering rates and associated CO2 consumption. Very less studies are reported from these catchments notwithstanding their importance as potential sinks of atmospheric CO2 at the global scale. A total of 156 samples were collected from a small river catchment
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Contribution of Hydrothermal Processes to the Enrichment of Lithium in Brines: Evidence from Water–Rock Interacting Experiments Aquat. Geochem. (IF 1.6) Pub Date : 2021-04-20 Xueyin Yuan, Yufei Hu, Yanjun Zhao, Qiang Li, Chenglin liu
Over the world, the available lithium (Li) resources are reserved mainly in closed-basin brines, with high Li concentration (> 150 mg/L) and low Mg/Li ratio (< 10) being critical for Li extraction using precipitation-based methods. In order to investigate the enrichment of Li over Mg during the formation of Li brine deposits, batch water–rock interacting experiments between igneous rocks and aqueous
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Metal Speciation in Water of the Flooded Mine “Arsenic” (Karelia, Russia): Equilibrium-Kinetic Modeling with a Focus on the Influence of Humic Substances Aquat. Geochem. (IF 1.6) Pub Date : 2021-02-18 Elena V. Cherkasova, Artem A. Konyshev, Evgeniya A. Soldatova, Evgeniya S. Sidkina, Mikhail V. Mironenko
Equilibrium-kinetic modeling allows investigating metal behavior in the water–rock-organic matter system with time to evaluate anthropogenic effects on the environment. In the article, the interactions of stagnant mine drainage water of the flooded mine “Arsenic” with ore and gangue minerals were simulated using different organic matter incorporation approaches. If the model is closed to humic substances
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Free Eu(III) Determination by Donnan Membrane Technique with Electrochemical Detection: Implementation and Evaluation Aquat. Geochem. (IF 1.6) Pub Date : 2021-02-17 Noémie Janot, Jan E. Groenenberg, Alba Otero-Fariña, José Paulo Pinheiro
The aim of this study was to develop an analytical method to determine free concentrations of Europium (Eu(III)) in natural waters. Europium(III) in solution was detected using cathodic stripping voltammetry after complexation with N-nitroso-N-phenylhydroxylamine (cupferron). Optimization of analytical parameters allowed us to detect nanomolar levels of Eu(III) in solution. Free Eu(III) in solution
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Concentration of Iron(II) in Fresh Groundwater Controlled by Siderite, Field Evidence Aquat. Geochem. (IF 1.6) Pub Date : 2021-01-03 C. G. E. M. van Beek, D. G. Cirkel, M. J. de Jonge, N. Hartog
Iron(II) concentrations in fresh groundwater in Dutch aquifers range from absent up to 50 mg/l. Evaluation of extensive chemical data sets learned that the maximum logarithmic concentration of iron(II) in aquifers, between ± 6.5 < pH < ± 8, is a linear function of pH, governed by Siderite. It is a broad relation due to oversaturation with respect to Siderite and to variation in alkalinity. Iron(II)
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Experimental and Modeling Studies on Sorption Behaviour of 133 Ba(II) on Fe–Montmorillonite Clay Minerals Aquat. Geochem. (IF 1.6) Pub Date : 2020-09-11 Santosh Chikkamath, Madhuri A. Patel, Aishwarya S. Kar, Vaibhavi V. Raut, Bhupendra. S. Tomar, J. Manjanna
Fe type clay minerals, Fe–montmorillonite, are expected to form in the nuclear waste repositories over a span of few years owing to the interaction of corrosion products from overpack and/or canister with bentonite consisting of montmorillonite (Mt) as the major clay mineral. Therefore, it is important to understand the properties of altered clay minerals, Fe–Mt. In the present study, the sorption
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Climate Change-Induced Changes in the Chemistry of a High-Altitude Mountain Lake in the Central Alps Aquat. Geochem. (IF 1.6) Pub Date : 2020-08-18 Sandra M. Steingruber, Stefano M. Bernasconi, Giorgio Valenti
Mountains are among the most sensitive ecosystems to climate change, and one of the most evident signs of climate-related effect is the continuous net loss of ice from the cryosphere. Several studies showed that meltwater from glaciated and perennially frozen areas can profoundly affect alpine aquatic ecosystems. Here, we present the impressive temporal increase in solutes in Lake Leit, a mountain
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Correction to: Ultra-trace Element Characterization of the Central Ottawa River Basin Using a Rapid, Flexible, and Low-Volume ICP-MS Method Aquat. Geochem. (IF 1.6) Pub Date : 2020-07-28 Michael G. Babechuk, Edel M. O’Sullivan, Cora A. McKenna, Carolina Rosca, Thomas F. Nägler, Ronny Schoenberg, Balz S. Kamber
In the original publication of the article, the content under the section heading has been published incorrectly. Now the same has been corrected in this correction.
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Effects of Bioirrigation and Salinity on Arsenic Distributions in Ferruginous Concretions from Salt Marsh Sediment Cores (Southern Brazil) Aquat. Geochem. (IF 1.6) Pub Date : 2020-07-17 Larissa Costa, Nicolai Mirlean, Guilherme Quintana, Segun Adebayo, Karen Johannesson
Arsenic (As), iron (Fe), and manganese (Mn) contents were measured in sediment nodules and associated pore waters obtained from sediment cores collected from a salt marsh on Pólvora Island (southern Brazil). Sediment cores were obtained when brackish water dominated the estuary, at two different environments: an unvegetated mudflat colonized by crabs (Neohelice granulata), and a low intertidal stand
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Correction to: The Effect of Bacterial Sulfate Reduction Inhibition on the Production and Stable Isotopic Composition of Methane in Hypersaline Environments Aquat. Geochem. (IF 1.6) Pub Date : 2020-07-10 Cheryl A. Kelley, Brad M. Bebout, Jeffrey P. Chanton, Angela M. Detweiler, Adrienne Frisbee, Brooke E. Nicholson, Jennifer Poole, Amanda Tazaz, Claire Winkler
For reason beyond the control of the authors or the editors, the article.
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Correction to: Colloidal Organic Matter and Metal(loid)s in Coastal Waters (Gulf of Trieste, Northern Adriatic Sea) Aquat. Geochem. (IF 1.6) Pub Date : 2020-07-10 Katja Klun, Ingrid Falnoga, Darja Mazej, Primož Šket, Jadran Faganeli
For reason beyond the control of the authors or the editors, the article titled “Colloidal Organic Matter and Metal(loid)s in Coastal Waters (Gulf of Trieste, Northern Adriatic Sea)” by Katja Klun1 · Ingrid Falnoga2 · Darja Mazej2 · Primož Šket3 · Jadran Faganeli1 (https://doi.org/10.1007/s10498-019-09359-6) was published in the regular issue Vol. 25 issue 5-6 instead of this special section, where
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Stable Carbon Isotopes δ 13 C as a Proxy for Characterizing Carbon Sources and Processes in a Small Tropical Headwater Catchment: Nsimi, Cameroon Aquat. Geochem. (IF 1.6) Pub Date : 2020-07-01 Gustave Raoul Nkoue Ndondo, J.-L. Probst, J. Ndjama, Jules Remy Ndam Ngoupayou, J.-L. Boeglin, G. E. Takem, F. Brunet, J. Mortatti, F. Gauthier-Lafaye, J.-J. Braun, G. E. Ekodeck
Stream carbon fluxes are one of the major components in the global C cycle, yet the discrimination of the various sources of stream carbon remains to a large extent unclear and less is known about the biogeochemical transformations that accompany the transfer of C from soils to streams. Here, we used patterns in stream water and groundwater δ13C values in a small forested tropical headwater catchment
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Kinetics of Thiocyanate Formation by Reaction of Cyanide with Tetrathionate Aquat. Geochem. (IF 1.6) Pub Date : 2020-06-29 Irina Kurashova, Alexey Kamyshny
In aquatic systems a reaction between tetrathionate and cyanide results in the formation of thiocyanate. We have studied kinetics of the reactions of tetrathionate with free cyanide and two cyanide complexes, hexacyanoferrate(II) and hexacyanoferrate(III), at the environmentally relevant conditions. For the reaction between tetrathionate and free cyanide, the rate constant and the activation energy
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Hydrogeochemical Conditions in Groundwater Systems with Various Geomorphological Units in Kulonprogo Regency, Java Island, Indonesia Aquat. Geochem. (IF 1.6) Pub Date : 2020-06-24 Reinaldy Pratama Poetra, Tjahyo Nugroho Adji, Langgeng Wahyu Santosa, Nurul Khakhim
Geomorphological (landform) aspects have long been known to control groundwater conditions in an area. Thus, combining the hydrogeological and geomorphological aspects (lithology, genesis, and morphology) becomes a prospective approach for understanding and delineating the hydrogeochemical processes in an area. The idea is then applied in Kulonprogo, Java, Indonesia, that consists of several landforms
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Influence of CO 2 on Water Chemistry and Bacterial Community Structure and Diversity: An Experimental Study in the Laboratory Aquat. Geochem. (IF 1.6) Pub Date : 2020-06-22 Hongying Zhang, Zongjun Gao, Mengjie Shi, Shaoyan Fang
As the second largest carbon pool, soil has a high CO2 content, and it has an important impact on water–rock interactions and the bacterial community structure and diversity in soils. In this paper, three sets of laboratory simulation experiments under six levels of partial pressure CO2 (pCO2) conditions were used to analyze and study the CO2–water–rock interactions and the bacterial community structure
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An Introduction to “Microbial Biogeochemistry: A Special Issue of Aquatic Geochemistry Honoring Mark Hines” Aquat. Geochem. (IF 1.6) Pub Date : 2020-05-22 W. Berry Lyons,David J. Burdige
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Porewater Carbonate Chemistry Dynamics in a Temperate and a Subtropical Seagrass System Aquat. Geochem. (IF 1.6) Pub Date : 2020-05-16 Theodor Kindeberg, Nicholas R. Bates, Travis A. Courtney, Tyler Cyronak, Alyssa Griffin, Fred T. Mackenzie, May-Linn Paulsen, Andreas J. Andersson
Seagrass systems are integral components of both local and global carbon cycles and can substantially modify seawater biogeochemistry, which has ecological ramifications. However, the influence of seagrass on porewater biogeochemistry has not been fully described, and the exact role of this marine macrophyte and associated microbial communities in the modification of porewater chemistry remains equivocal
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Chemical Weathering in Small Mountainous Rivers of Southern Italy and Northern Spain Aquat. Geochem. (IF 1.6) Pub Date : 2020-05-13 Anne E. Carey, Julia M. Young, Susan A. Welch, Kathleen A. Welch, Christopher B. Gardner, W. Berry Lyons
Since the seminal work of Milliman and Syvitski (J Geol 100:525–544, 1992), there has been interest in evaluating the significance of small mountainous river (SMRs) systems and their role in the transport of both solutes, and especially sediments, to the world ocean. Although some data exist from portions of the Earth’s mountainous regions, the majority of this work has been focused in the western
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Ultra-trace Element Characterization of the Central Ottawa River Basin using a Rapid, Flexible, and Low-volume ICP-MS Method Aquat. Geochem. (IF 1.6) Pub Date : 2020-05-05 Michael G. Babechuk, Edel M. O’Sullivan, Cora A. McKenna, Carolina Rosca, Thomas F. Nägler, Ronny Schoenberg, Balz S. Kamber
Ultra-trace (< 1 ng g−1) rare earth elements and yttrium (REE + Y) and high field strength element (HFSE) geochemistry of freshwater can constrain element sources, aqueous processes in hydrologic catchments, and the signature of dissolved terrestrial fluxes to the oceans. This study details an adapted method capable of quantifying ≥ 38 elements (including all REE + Y, Nb, Ta, Zr, Hf, Mo, W, Th, U)
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Octanol–Water Partition Coefficients of Aristolochic Acids and Implications to the Etiology of Balkan Endemic Nephropathy Aquat. Geochem. (IF 1.6) Pub Date : 2020-05-05 Chaiyanun Tangtong, Lulu Qiao, David T. Long, Thomas C. Voice
The octanol–water partition coefficients (Kow) of the aristolochic acids, AA I and AA II, were determined using the traditional shake-flask method as a function of pH and ionic strength. These compounds have been implicated in the etiology of Balkan endemic nephropathy, but evidence of a plausible exposure pathway remains elusive, and research is constrained by the absence of critical physical–chemical
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Seasonal and Spatial Variations of Chemical Weathering in the Mekong Basin: From the Headwaters to the Lower Reaches Aquat. Geochem. (IF 1.6) Pub Date : 2020-04-23 Hiroto Kajita, Yuki Ota, Toshihiro Yoshimura, Daisuke Araoka, Takuya Manaka, Ouyang Ziyu, Shinya Iwasaki, Takuya Yanase, Akihiko Inamura, Etsuo Uchida, Hongbo Zheng, Qing Yang, Ke Wang, Atsushi Suzuki, Hodaka Kawahata
Chemical weathering in the Himalayan river basins is among the highest in the world and has received vast research attention related to past climate change. Many early estimates of chemical weathering are based on a small number of water property data that ignore those spatial and seasonal variations. Therefore, this study analyzed spatial and seasonal variations in chemical weathering in the Mekong
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Effect of Organic Alkalinity on Seawater Buffer Capacity: A Numerical Exploration Aquat. Geochem. (IF 1.6) Pub Date : 2020-04-20 Xinping Hu
Organic alkalinity is a poorly understood component of total titration alkalinity in aquatic environments. Using a numerical method, the effects of organic acid (HOA) and its conjugate base (OA−) on seawater carbonate chemistry and buffer behaviors, as well as those in a hypothetical estuarine mixing zone, are explored under both closed- and open-system conditions. The simulation results show that
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The Effects of pH, Temperature, and Humic-Like Substances on Anaerobic Carbon Degradation and Methanogenesis in Ombrotrophic and Minerotrophic Alaskan Peatlands Aquat. Geochem. (IF 1.6) Pub Date : 2020-04-06 Lin Zhang, Xiao Liu, Khrys Duddleston, Mark E. Hines
Methane production usually increases from the acidic sphagnum-dominated ombrotrophic peatlands to minerotrophic ones with more neutral pH and higher coverage of vascular plants. Along this ombrotrophic–minerotrophic gradient, pH, microbial communities, and properties of dissolved organic matter in porewater all vary greatly. The hydrographic change resulted from permafrost thaw and projected global
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The Role of a Tidal Flat–Saltmarsh System as a Source–Sink of Mercury in a Contaminated Coastal Lagoon Environment (Northern Adriatic Sea) Aquat. Geochem. (IF 1.6) Pub Date : 2020-04-06 Elisa Petranich, Luca Terribili, Alessandro Acquavita, Elena Pavoni, Leonardo Langone, Stefano Covelli
The Marano and Grado Lagoon (northern Adriatic Sea, Italy) is contaminated mainly by mercury (Hg) of mining and industrial origin. This work aims to investigate the sedimentary records of Hg of a tidal flat–saltmarsh (TF–S) system and to understand the role played by tidal fluxes in terms of the transport, accumulation and release of Hg due to the periodic flow of the tide. The complex history of the
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Radium Isotopes as a Tracer of Water Sources and Mixing in the Vidourle Stream (South of France) Aquat. Geochem. (IF 1.6) Pub Date : 2020-03-11 Arnold Molina-Porras, Michel Condomines, Pierre-Louis Legeay, Vincent Bailly-Comte, Jean Luc Seidel
This study reports analyses of Ra isotopes in a Mediterranean stream, the Vidourle river, whose upper course drains the granitic and metamorphic basement of the SE part of the French Massif Central (Cévennes) and then flows through the karstified carbonates of Jurassic and Cretaceous ages. In these low-Ra waters (226Ra activities range from 1.5 to 4.9 mBq/L), all four Ra isotopes were successfully
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Ecosystem-Scale Modeling and Field Observations of Sulfate and Methylmercury Distributions in the Florida Everglades: Responses to Reductions in Sulfate Loading Aquat. Geochem. (IF 1.6) Pub Date : 2020-02-15 William H. Orem, Carl Fitz, David P. Krabbenhoft, Brett A. Poulin, Matthew S. Varonka, George R. Aiken
The Florida Everglades has one of the most severe methylmercury (MeHg) contamination issues in the USA, resulting from factors including high rates of atmospheric mercury (Hg) deposition and sulfate inputs from agricultural lands. Sulfate loading stimulates microbial sulfate reduction and production of toxic and bioaccumulative MeHg. Controls on regional Hg emissions have been successful in reducing
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Incorporation of Rare Earths and Yttrium in Calcite: A Critical Re-evaluation Aquat. Geochem. (IF 1.6) Pub Date : 2020-02-12 Peter Möller, Marco De Lucia
The reported partition coefficients of REE with calcite are reviewed and critically discussed. In some of the reported experimental sets, REE concentrations are found to be supersaturated with respect to individual REE2(CO3)3 but never to REE(OH)3. Although the solutions are unsaturated with respect to individual REY carbonates, REY including Y are incorporated in calcite surfaces, where they are overgrown
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Characterizing Soil Dissolved Organic Matter in Typical Soils from China Using Fluorescence EEM–PARAFAC and UV–Visible Absorption Aquat. Geochem. (IF 1.6) Pub Date : 2020-01-02 Xiao-quan Qin, Bo Yao, Liang Jin, Xiang-zhou Zheng, Jie Ma, Marc F. Benedetti, Yongtao Li, Zong-ling Ren
Dissolved organic matter (DOM) strongly participates in a variety of critical environmental and ecological processes and has a large impact on environmental quality. In this study, ultraviolet–visible absorbance spectroscopy and excitation–emission matrices of fluorescence spectroscopy in combination with parallel factor analysis (EEMs–PARAFAC) were applied to characterize a total of 92 DOM samples
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Mineral Magnetic and Geochemical Mapping of the Wular Lake Sediments, Kashmir Valley, NW Himalaya Aquat. Geochem. (IF 1.6) Pub Date : 2019-12-13 Rayees A. Shah, Hema Achyuthan, Satish J. Sangode, Aasif M. Lone, Mohammd Rafiq
This study presents major element geochemistry, mineral magnetism and textural analysis of lake-bottom sediments collected from the Wular Lake located in the Kashmir Valley (northwest Himalaya). Connected to the Jhelum River, Wular Lake basin occupies ~ 75% watershed area of the valley, covering ~ 10,196 km2, and makes it the major depo-centre for Kashmir Valley. The sediments represent dominant silt
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Geochemical Behavior of REE in Stream Water and Sediments in the Gold-Bearing Lom Basin, Cameroon: Implications for Provenance and Depositional Environment Aquat. Geochem. (IF 1.6) Pub Date : 2019-12-13 Mumbfu Ernestine Mimba, Mengnjo Jude Wirmvem, Salomon César Nguemhe Fils, Nozomi Numanami, Melvin Tamnta Nforba, Takeshi Ohba, Festus Tongwa Aka, Cheo Emmanuel Suh
Stream water and associated bottom sediments were sampled within the Lom Basin, and their rare earth element (REE) concentrations have been used to decipher their provenance and environment of deposition. Stream waters in the lower Lom Basin have variable Post Archean Australian Shale-normalized REE concentrations (0.24–4978 ng/l), positive Ce anomalies (Ce/Ce* ranges from 1.08 to 8.03), a general
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Geochemistry of the Lake Chad Tributaries Under Strongly Varying Hydro-climatic Conditions Aquat. Geochem. (IF 1.6) Pub Date : 2019-11-29 A. Mahamat Nour, C. Vallet-Coulomb, C. Bouchez, P. Ginot, J. C. Doumnang, F. Sylvestre, P. Deschamps
The Lake Chad Basin (LCB) is one of the main endorheic basins in the world and has undergone large-level and surface variations during the last decades, particularly during the Sahelian dry period in the 1970s and the 1980s. The Chari–Logone River system covers 25% of the LCB but accounts for up to 82% of the Lake Chad water supply. The aim of this study is to investigate the dissolved phase transported
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The Effect of Bacterial Sulfate Reduction Inhibition on the Production and Stable Isotopic Composition of Methane in Hypersaline Environments Aquat. Geochem. (IF 1.6) Pub Date : 2019-11-19 Cheryl A. Kelley, Brad M. Bebout, Jeffrey P. Chanton, Angela M. Detweiler, Adrienne Frisbee, Brooke E. Nicholson, Jennifer Poole, Amanda Tazaz, Claire Winkler
The aim of this research was to investigate the competition between methanogens and sulfate-reducing bacteria in hypersaline environments. Samples of photosynthetic microbial mats, both soft mats (salinities of 55–126 ppt) and gypsum-hosted endoevaporite mats (salinities of 77–320 ppt), were obtained from hypersaline environments in California, USA, Mexico and Chile. Methane production was determined
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Kinetics of Thiocyanate Formation by Reaction of Cyanide and Its Iron Complexes with Thiosulfate Aquat. Geochem. (IF 1.6) Pub Date : 2019-11-07 Irina Kurashova, Alexey Kamyshny
Reactions between cyanide and compounds, which contain S–S bonds, in aqueous media result in formation of thiocyanate. In this work, we studied the kinetics of reactions of thiosulfate with free cyanide and its complexes under environmental conditions. Rates of reactions between cyanide species and thiosulfate decrease in the following order: CN− > HCN > [Fe(CN)6]3− > [Fe(CN)6]4−. However, at neutral