秸秆生物炭对矿区污染土壤重金属形态转化的影响

doi:10.11934/j.issn.1673-4831.2017.05.010

摘要/Abstract

摘要：

以小麦秸秆制备的生物炭作为修复材料，通过室内培养试验研究不同生物炭施用量（w分别为0、1%、2%和5%）对矿区复合污染土壤Cu、Zn、Cd和Pb赋存形态的影响。结果表明，经过150 d的培养，施用生物炭可明显提高土壤pH值和有机碳含量，比对照分别增加0.96%~2.62%和9.1%~38.6%。土壤中酸提取态Cu、Zn和Cd含量随生物炭施用量的增加而降低，与不施用生物炭相比下降幅度分别为7.0%~16.9%、6.7%~11.8%和5.3%~9.6%，酸提取态Pb含量无明显变化。生物炭可不同程度地减少可还原态Cd和可氧化态Cu、Zn、Pb含量。施用生物炭处理残渣态Cu、Zn、Cd和Pb含量明显提高，与不施用生物炭相比增加幅度分别为10.6%~46.8%、5.9%~15.7%、40.9%~191.9%和1.5%~2.6%。相关性分析表明，土壤pH值、有机碳含量与酸提取态和残渣态重金属含量显著相关。综合而言，生物炭能够促进供试污染土壤Cu、Zn、Cd和Pb由酸提取态、可还原态和可氧化态向残渣态转化。

关键词: 生物炭, 重金属复合污染, BCR连续提取, 形态转化

Abstract:

An in-lab incubation experiment was conducted on applying biochar derived from wheat straw as a soil remediation amendment to study effect of the application, relative to rate, on forms of heavy metals in mining contaminated soil. Results show that after 150 days of incubation, biochar in the soil significantly increased soil pH and organic carbon content by 0.96%-2.62% and 9.1%-38.6%, respectively. With increasing biochar application rate, the content of acid-extractable Cu, Zn and Cd in the contaminated soil decreased by 7.0%-16.9%, 6.7%-11.8% and 5.3%-9.6%, respectively, while acid-extractable Pb remained almost unchanged. Biochar reduced the contents of reducible Cd and oxidizable Cu, Zn and Pb. The content of residual Cu, Zn, Cd and Pb increased obviously by 10.6%-46.8%, 5.9%-15.7%, 40.9%-191.9% and 1.5%-2.6%, respectively, in biochar amended treatments. Correlation analysis shows that soil pH values and organic carbon contents were significantly correlated with the contents of acid-extractable and residual heavy metals. In short, biochar can promote transformation of Cu, Zn, Cd and Pb in the contaminated soil from acid-extractable, reducible and oxidizable forms to residual form.

Key words: biochar, complex contamination of heavy metals, BCR sequential extraction, form transformation

中图分类号:

吴萍萍, 李录久, 王家嘉, 李敏. 秸秆生物炭对矿区污染土壤重金属形态转化的影响[J]. 生态与农村环境学报, 2017, 33(5): 453-459.

WU Ping-ping, LI Lu-jiu, WANG Jia-jia, LI Min. Effects of Application of Straw-Derived Biochar on Forms of Heavy Metals in Mining Contaminated Soil[J]. Journal of Ecology and Rural Environment, 2017, 33(5): 453-459.

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