Effect of aging on the bioavailability and fractionation of arsenic in soils derived from five parent materials in a red soil region of Southern China

文献类型： 外文期刊

第一作者： Wang, Yanan

作者： Wang, Yanan;Zeng, Xibai;Su, Shiming;Bai, Lingyu;Li, Lianfang;Wu, Cuixia;Wang, Yanan;Lu, Yahai

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关键词： Arsenic (As);Aging process;Aging mechanism;Chemical kinetic equations

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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收录情况： SCI

摘要： The effects of aging time and soil parent materials on the bioavailability and fractionations of arsenic (As) in five red soils were studied. The results indicated that As bioavailability in all soils decreased during aging, especially with a sharp decline occurring in the first 30 days. After aging for 360 days, the highest available As concentration, which accounted for 12.3% of the total, was observed in soils derived from purple sandy shale. While 2.67% was the lowest proportion of the available As in soils derived from quaternary red clay. Furthermore, the best fit of the available As changing with aging time was obtained using the pseudo-second-order model (R-2 = 0.939-0.998, P < 0.05). Notably, Al oxides played a more crucial role (R-2 = 0.89, P< 0.05) than did Fe oxides in controlling the rate of As aging. The non-specially and specially absorbed As constituted the primary forms of available As. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： X5

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