Aging of nickel added to soils as predicted by soil pH and time

文献类型： 外文期刊

第一作者： Ma, Yibing

作者： Ma, Yibing;Ma, Yibing;Lombi, Enzo;McLaughlin, Mike J.;Oliver, Ian W.;Nolan, Annette L.;Lombi, Enzo;McLaughlin, Mike J.;Oorts, Koen;Smolders, Erike

作者机构：

关键词： Aging;Nickel;E value;Soil;Labile metal

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Although aging processes are important in risk assessment for metals in soils, the aging of Ni added to soils has not been studied in detail. In this study, after addition of water soluble Ni to soils, the changes over time in isotopic exchangeability, total concentrations and free Ni~(2+) activity in soil pore water, were investigated in 16 European soils incubated outdoors for 18 months. The results showed that after Ni addition, concentrations of Ni in soil pore water and isotopic exchangeability of Ni in soils initially decreased rapidly. This phase was followed by further decreases in the parameters measured but these occurred at slower rates. Increasing soil pH increased the rate and extent of aging reactions. Semi-mechanistic models, based on Ni precipitation/nucleation on soil surfaces and micropore diffusion, were developed and calibrated. The initial fast processes, which were attributed to precipitation/nucleation, occurred over a short time (e.g. 1 h), afterwards the slow processes were most likely controlled by micro-pore diffusion processes. The models were validated by comparing predicted and measured Ni aging in three additional, widely differing soils aged outdoors for periods up to 15 months in different conditions. These models could be used to scale ecotoxicological data generated in short-term studies to longer aging times.

分类号： X5

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