作者
Scott C Maguffin, Lena Abu-Ali, Ryan V Tappero, Jasquelin Pena, Jai S Rohila, Anna M McClung, Matthew C Reid
发表日期
2020/5/1
期刊
Geochimica et Cosmochimica Acta
卷号
276
页码范围
50-69
出版商
Pergamon
简介
Arsenic (As) mobilization in rice paddy soils under fluctuating redox conditions is influenced by the biogeochemical cycling of redox sensitive elements such as iron (Fe) and manganese (Mn). Arsenic mobility in paddy soils is highly variable, and the influence of Mn abundances and Mn/Fe ratios on As mobility in these soils have received little attention. In this contribution, we developed a complementary set of field and laboratory experiments designed to evaluate the impact of Mn on interconnected Fe and As solubilization in rice paddy soils experiencing wetting-drying cycles through controlled irrigation. Porewater monitoring and synchrotron-based imaging and spectroscopy of thin sections prepared from an Arkansas paddy soil confirmed that As release was primarily governed by reductive dissolution of Fe (oxy)hydroxide phases. Experiments with laboratory soil microcosms amended with the synthetic …
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SC Maguffin, L Abu-Ali, RV Tappero, J Pena, JS Rohila… - Geochimica et Cosmochimica Acta, 2020