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Dynamics of the dissolved organic matter in a stream-lake system within an extremely acid to neutral pH range: Agrio-Caviahue watershed.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-03-19 , DOI: 10.1016/j.saa.2020.118278
J M Cabrera 1 , P E García 2 , F L Pedrozo 1 , C P Queimaliños 2
Affiliation  

The Agrio-Caviahue is a natural stream-lake system composed of the Upper Agrio River (UAR) -Lake Caviahue-Lower Agrio River (LAR). The system has a broad pH gradient from extremely acid in the hot spring to almost neutral pH only 60 km downstream the source, and varies as a function of the distance. The aim of this study was to analyze the dynamics of the dissolved organic matter (DOM) of this extreme system. For that matter, an absorbance and fluorescence-based characterization was performed on natural water samples and hydrophobic resin DOM extracts during different seasons in nine sampling stations. Between August and December, the hydrological connectivity is maximum due to precipitation and snowmelt, respectively. During these months, the stream that exits the lake governs the chemical characteristics downstream mainly in the period of high connectivity. In contrast, in the dry season when the flow of LAR is minimum, the two major affluents of this river influence its pH and DOM features, and deliver inputs of humified DOM from the wetlands where the tributaries are born. DOM was characterized by having low absorbance. The PARAFAC analysis of the fluorescent DOM (FDOM) validated three fluorescent components in the natural samples (with humic and non-humic features), two of which were also recorded in the extracts, meaning that no additional hydrophobic components were missed under the limit of detection of the fluorometer. The unique features of Agrio-Caviahue DOM resemble those found in DOM from Yellowstone hot springs, both acid and alkaline.

中文翻译:

在极端酸至中性pH范围内的流湖系统中溶解的有机物的动力学:Agrio-Caviahue分水岭。

Agrio-Caviahue是由上阿格里奥河(UAR)-Caviahue湖-下阿格里奥河(LAR)组成的自然流湖系统。该系统具有宽广的pH梯度,从温泉中的极强酸性到源头下游仅60 km的几乎中性pH,并且随距离而变化。这项研究的目的是分析此极端系统的溶解有机物(DOM)的动力学。为此,在九个采样站的不同季节对天然水样品和疏水性树脂DOM提取物进行了吸收和基于荧光的表征。在八月和十二月之间,由于降水和融雪,水文连通性最大。在这几个月里 离开湖泊的溪流主要在高连通性时期控制着下游的化学特性。相反,在干旱季节,LAR流量最小,这条河的两个主要富裕度影响其pH和DOM特征,并从支流出生的湿地中输送腐殖化的DOM。DOM的特征在于吸光度低。对荧光DOM(FDOM)进行的PARAFAC分析验证了天然样品中的三个荧光成分(具有腐殖质和非腐殖质特征),萃取物中还记录了其中两个,这意味着在荧光计的检测。Agrio-Caviahue DOM的独特特征与黄石温泉中酸性和碱性的DOM相似。在LAR流量最小的干旱季节,这条河的两个主要富裕度会影响其pH和DOM特征,并从支流出生的湿地中输送腐殖化的DOM。DOM的特征在于吸光度低。对荧光DOM(FDOM)进行的PARAFAC分析验证了天然样品中的三个荧光成分(具有腐殖质和非腐殖质特征),萃取物中还记录了其中两个,这意味着在荧光计的检测。Agrio-Caviahue DOM的独特特征与黄石温泉中酸性和碱性的DOM相似。在LAR流量最小的干旱季节,这条河的两个主要富裕度会影响其pH和DOM特征,并从支流出生的湿地中输送腐殖化的DOM。DOM的特征在于吸光度低。PARAFAC对荧光DOM(FDOM)的分析验证了天然样品中的三种荧光成分(具有腐殖质和非腐殖质特征),萃取物中还记录了其中的两个,这意味着在荧光计的检测。Agrio-Caviahue DOM的独特特征与黄石温泉中酸性和碱性的DOM相似。并从支流出生地的湿地中提供腐殖质DOM。DOM的特征在于吸光度低。对荧光DOM(FDOM)进行的PARAFAC分析验证了天然样品中的三个荧光成分(具有腐殖质和非腐殖质特征),萃取物中还记录了其中两个,这意味着在荧光计的检测。Agrio-Caviahue DOM的独特特征与黄石温泉中酸性和碱性的DOM相似。并从支流出生地的湿地中提供腐殖质DOM。DOM的特征在于吸光度低。对荧光DOM(FDOM)进行的PARAFAC分析验证了天然样品中的三个荧光成分(具有腐殖质和非腐殖质特征),萃取物中还记录了其中两个,这意味着在荧光计的检测。Agrio-Caviahue DOM的独特特征与黄石温泉中酸性和碱性的DOM相似。这意味着在荧光计的检测极限内,不会遗漏任何其他疏水成分。Agrio-Caviahue DOM的独特特征与黄石温泉中酸性和碱性的DOM相似。这意味着在荧光计的检测极限内,不会遗漏任何其他疏水成分。Agrio-Caviahue DOM的独特特征与黄石温泉中酸性和碱性的DOM相似。
更新日期:2020-03-20
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