Effects of digestate DOM on chemical behavior of soil heavy metals in an abandoned copper mining areas

Journal of Hazardous Materials
Xujing GuoYang Huang

Abstract

The influence of digestate dissolved organic matter (DOM) on chemical behavior of soil heavy metals (HMs) in an abandoned copper mining areas was explored by fluorescence quenching titration and heavy metal extracting experiment. Five fluorescent components were obtained from digestate DOM by PARAFAC model combined with the EEM data. The stability constant (log KM) values were in the range of 4.95-5.53, 5.05-5.29, 5.21-6.00, and 4.12-4.75 for DOM-Cr(III), DOM-Cu(II), DOM-Fe(III) and DOM-Pb(II) complexes, respectively. Alcohols, ethers and esters in digestate DOM were preferentially combined with Fe(III), Cu(II) and Zn(II). However, phenolic hydroxyl groups were more likely to combine with Cr(III) and Pb(II). The speciation distribution of HMs indicated that mining resulted in a higher concentration of Cu(II) in the grassland soil (GS) than those in the agricultural soil (AS) and forest land soil (FS). Fe-Mn oxides and organic forms of Pb(II) increased dramatically due to mining. Digestate DOM extraction can increase the content of Cr(III), Fe(III) and Pb(II), and decrease the content of Cu(II) and Zn(II) in the AS, GS, and FS. However, the contents of HMs in the mining soil (MS) and slag soil (SS) decreased due to the applicati...Continue Reading

Citations

Aug 5, 2020·Journal of the Science of Food and Agriculture·Furong TanLin He
Feb 14, 2021·The Science of the Total Environment·Jordan Brizi NerisCaio Marcio Paranhos
Mar 11, 2021·Ecotoxicology and Environmental Safety·Xujing GuoChangwu Zou
Jul 2, 2021·Ecotoxicology and Environmental Safety·Xujing GuoDonghai Yuan

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