TY - JOUR
T1 - Effects of biochar amendments on speciation and bioavailability of heavy metals in coal-mine-contaminated soil
AU - Dai, Shunli
AU - Li, Hui
AU - Yang, Zhiliang
AU - Dai, Mingwei
AU - Dong, Xinju
AU - Ge, Xin
AU - Sun, Mei
AU - Shi, Liulin
N1 - Publisher Copyright:
© 2018, © 2018 Taylor & Francis Group, LLC.
PY - 2018/10/3
Y1 - 2018/10/3
N2 - An incubation experiment was executed on applying biochar as a soil remediation amendment to discuss an effect of the various addition rates on the speciation and bioavailability of heavy metals in mining-contaminated soil. The result showed that the content of Cd in soil was 9.51 times higher than the Huainan soil background values. The contents of Cu, Zn and As were 2.97, 1.60 and 1.42 times the background values, respectively, and the total contents of all heavy metals were higher than the standard values of soil environment quality GB15618-1995 set by the China Ministry of Environmental Protection. Speciation analysis indicated that Cu and Cd were mainly associated with the reducible fraction, while Zn and As were dominated by the residual fraction. After biochar was added to contaminated soil, the residual fractions of heavy metals increased, while the acid-soluble fractions reduced. According to the results of CaCl2 extraction experiment, CaCl2-extractable concentrations of Cu, Zn, As, and Cd were observed with a biochar dosage rate of 10%, which were 57.26%, 51.37%, 6.94% and 42.04% lower than those of control soil samples, respectively, but there were no obvious changes of CaCl2-extractable As.
AB - An incubation experiment was executed on applying biochar as a soil remediation amendment to discuss an effect of the various addition rates on the speciation and bioavailability of heavy metals in mining-contaminated soil. The result showed that the content of Cd in soil was 9.51 times higher than the Huainan soil background values. The contents of Cu, Zn and As were 2.97, 1.60 and 1.42 times the background values, respectively, and the total contents of all heavy metals were higher than the standard values of soil environment quality GB15618-1995 set by the China Ministry of Environmental Protection. Speciation analysis indicated that Cu and Cd were mainly associated with the reducible fraction, while Zn and As were dominated by the residual fraction. After biochar was added to contaminated soil, the residual fractions of heavy metals increased, while the acid-soluble fractions reduced. According to the results of CaCl2 extraction experiment, CaCl2-extractable concentrations of Cu, Zn, As, and Cd were observed with a biochar dosage rate of 10%, which were 57.26%, 51.37%, 6.94% and 42.04% lower than those of control soil samples, respectively, but there were no obvious changes of CaCl2-extractable As.
KW - bioavailability
KW - biochar
KW - contaminated soil
KW - heavy metals
KW - speciation
UR - https://www.scopus.com/pages/publications/85041926694
U2 - 10.1080/10807039.2018.1429250
DO - 10.1080/10807039.2018.1429250
M3 - Article
AN - SCOPUS:85041926694
SN - 1080-7039
VL - 24
SP - 1887
EP - 1900
JO - Human and Ecological Risk Assessment
JF - Human and Ecological Risk Assessment
IS - 7
ER -