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Effects of Bioirrigation and Salinity on Arsenic Distributions in Ferruginous Concretions from Salt Marsh Sediment Cores (Southern Brazil)

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Abstract

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 vegetated by Spartina alterniflora. We determined the percentage of nodules in each depth interval of the cores, along with redox potential, and As, Fe, and Mn contents of the nodules. The mineralogy of the nodules was investigated, and results showed they are mainly composed by quartz, phyllosilicates, and amorphous Fe–Mn oxides/oxyhydroxides. Pore water results showed that bioturbation by local crabs supports oxygen penetration to depths of ca. 25 cm below the salt marsh surface, with lower Fe contents in pore water associated with the brackish period. However, S. alterniflora growth appears to have a greater impact on sediment geochemistry of Fe, Mn, and possibly As due to sulfate reduction and the associated decrease in pore water pH. Higher Fe concentrations were observed in the pore waters during the period of brackish water dominance, which also corresponded to the S. alterniflora growth season. The study demonstrates that differences in geochemical conditions (e.g., Fe content) that can develop in salt marsh sediments owing to different types of bioirrigation processes (i.e., bioirrigation driven by crabs versus that related to the growth of S. alterniflora) play important roles in the biogeochemical cycling of As.

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Notes

  1. SiMCosta is a Brazilian Coast Monitoring System, which consists of an integrated network of floating or fixed platforms, with capacity to collect real-time oceanographic and meteorological variables, transmitting them to a processing center at Federal University of Rio Grande (FURG).

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Acknowledgements

This study was supported by a Grant from “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil” (CAPES), as well as funds made available by Michael and Mathilda Cochran through the Cochran Family Professorship at Tulane University. We are also grateful to Dr. Deborah Grimm with the Coordinated Instrumentation Facility at Tulane University for assistance with the ICP-MS analyses and to Tanya Goehring for all the help with the XRD analyses.

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Correspondence to Larissa Costa.

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Costa, L., Mirlean, N., Quintana, G. et al. Effects of Bioirrigation and Salinity on Arsenic Distributions in Ferruginous Concretions from Salt Marsh Sediment Cores (Southern Brazil). Aquat Geochem 27, 79–103 (2021). https://doi.org/10.1007/s10498-020-09387-7

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  • DOI: https://doi.org/10.1007/s10498-020-09387-7

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