Assessing Chromium Contamination in Red Soil: Monitoring the Migration of Fractions and the Change of Related Microorganisms

Siyuan Zhang, Xiaodong Hao, Jiahui Tang, Jin Hu, Yan Deng, Menglong Xu, Ping Zhu, Jiemeng Tao, Yili Liang, Huaqun Yin, Luhua Jiang, Xueduan Liu and Hongwei Liu
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Siyuan Zhang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Xiaodong Hao: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Jiahui Tang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Jin Hu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Yan Deng: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Menglong Xu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Ping Zhu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Jiemeng Tao: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Yili Liang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Huaqun Yin: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Luhua Jiang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Xueduan Liu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Hongwei Liu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

IJERPH, 2020, vol. 17, issue 8, 1-15

Abstract: The improper stacking of chromium (Cr) slag poses a great threat to the environment and human health. The toxicity of Cr in soil is not only related to its total amount, but also to its fractions. A simulated experiment was conducted in laboratory to assess the environmental risk of Cr fractions migration and distribution in red soil. The results showed the content of acid-soluble and reducible Cr significantly decreased ( P < 0.05) in top layer but increased in middle and substratum layers over time. This indicated that acid-soluble and reducible Cr migrated downward with time and the relative mobility of acid-soluble Cr (0.038 mg/kg·d·m) was higher than that of reducible Cr (0.028 mg/kg·d·m). Furthermore, correlation analysis between microbial community and chromium fraction showed the relative abundance of Lysobacter , Flavihumibacter , Flavisolbacter, and Altererythrobacter was significantly ( P < 0.05) correlated with acid-soluble and reducible fractions. Thus, these microorganisms might be evaluators to assess the migration of acid-soluble and reducible fractions in red soil. In summary, this study provided a new comprehension on remediation of Cr-contaminated soil by monitoring the migration of acid-soluble and reducible fractions and the changes of related microbial groups.

Keywords: Cr pollution assessment; fractions migration and occurrence; relative mobility; microbial indication; red soil (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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