Periphyton and abiotic factors influencing arsenic speciation in aquatic environments

Environmental Toxicology and Chemistry
Adeline R LopezDavid B Buchwalter

Abstract

Benthic periphytic biofilms are important food sources at the base of aquatic ecosystems. These biofilms also sit at the interface of oxic waters and hypoxic sediments, and can be influenced by or influence trace element speciation. In the present study, we compared arsenic (As) enrichment in periphyton exposed to arsenate (As[V]) or arsenite (As[III]) (20 μg/L, static renewal, 7 d), and we found similar accumulation patterns of total As (101 ± 27 and 88 ± 22 mg kg-1 dry wt, respectively). Periphyton As was 6281- and 6684-fold higher than their aqueous exposures and occurred primarily as As(V). When these biofilms were fed to larval mayflies, similar total As tissue concentrations (13.9 and 14.6 mg kg-1 dry wt, respectively) were observed, revealing significant biodilution (∼ 10% of their dietary concentrations). Finally, we investigated the influence of aeration and periphyton presence on As speciation in solutions and solid phases treated with As(III). Predominantly As(III) solutions were slowly oxidized over a 7-d time period, in the absence of periphyton, and aeration did not strongly affect oxidation rates. However, in the presence of periphyton, solution and solid-phase analyses (by microscale x-ray absorption spectroscop...Continue Reading

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Citations

Jun 9, 2020·Histochemistry and Cell Biology·Cátia Gonçalves, Pedro M Costa
Sep 17, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Paula C FureySylvia Lee
Jan 4, 2021·Journal of Hazardous Materials·Ting GuoJianming Xu

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