期刊
OPEN CHEMISTRY
卷 18, 期 1, 页码 58-68出版社
DE GRUYTER POLAND SP Z O O
DOI: 10.1515/chem-2020-0005
关键词
heavy metal; humic-like substance; protein-like substance; binding parameter; EEM-PARAFAC analysis
资金
- GDAS' Project of Science and Technology Development [2019GDASYL-0501005]
- Program of Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, China [y809jm1001]
- Science and Technology Planning Project of Guangzhou City [201903010071]
To investigate the characteristics of humic acids (HAs) and the combined effects of HAs on heavy metals, three HAs derived from kitchen waste compost (KW), pig manure compost (PM), and green waste compost (GW) were exposed to Cd(II) and Zn(II). The elemental contents and functional groups of I lAs were different due to different raw materials. Fulvic-, humic-like content Cl, humic-like content C4, and two protein-like contents C2 and C3 were identified in three IIAs by EEM-PARAFAC analysis. The effects of HAs on heavy metals were associated with the metal species and HA source. Our results reveal that titrating Cd(II) caused stronger fluorescence quenching compared to titrating Zn(II) for all HAs. Cl and C4 of KW-HAs and PM-HAs showed fluorescence quenching after Cd(II) was added, whereas negligible fluorescence quenching was found when Zn(II) was added. In addition, Cl and C4 in the GW-HAs did not show obvious fluorescence quenching regardless of whether Cd(II) or Zn(II) was added. C3 in all HAs caused significant fluorescence quenching, suggesting that C3 plays an important role affecting the mobility of heavy metals. Consequently, these results suggest that HAs from KW and PM have greater potential for Cd-contaminated soil remediation than those from GW.
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