Effect of organic acids and soil particle size on heavy metal removal from bulk soil with washing

被引:0
作者
Xinhao Ren
Yu Chen
Ming Zhang
Yuenan Xu
Honglei Jia
Ting Wei
Junkang Guo
机构
[1] Shaanxi University of Science & Technology,School of Environmental Science and Engineering
来源
Environmental Geochemistry and Health | 2023年 / 45卷
关键词
Soil leaching; Heavy metals; Citric acid; Soil particle size; Bioavailability;
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暂无
中图分类号
学科分类号
摘要
To evaluate the effect of soil particle size on heavy metals removal by washing, two soil samples were collected around a lead–zinc mining area (SM) and lead–zinc smelter (SS). The total content of Cd, Pb and Zn in SM and SS were determined. And the effect of soil particle size on Cd removal by low molecular organic acids was studied. The results showed that Cd was the main pollutant and the total content of Cd in SS can reach to 24.8 mg Kg−1. 68.4% of the total Cd in SM existed in the form of residual state, while 54.7% of the total Cd in SS was in weak acid extractable state. About 50.0% of the Cd distributed in < 2 μm soil size fraction. The washing results indicated that citric acid was a highly efficient eluent among the five low molecular weight organic acids (citric acid, malic acid, tartaric acid, oxalic acid and acetic acid). After washing, 40% and 69.6% of the total Cd in SS and SM can be removed by citric acid, respectively. While only 18.7–40.2% and 32.6–68.7% of Cd was removed from different size fractions of SM and SS, respectively. The species of Cd in soil size fractions affected the removal effect of citric acid. The citric acid can easily remove the weak acid extractable and reducible form of Cd in soil. After eluted by citric acid, the bioavailability of Cd in soil decreased markedly, and the highest decreasing rate reached 93%.
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页码:3187 / 3198
页数:11
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