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Leachability of heavy metals in loess-amended dredged sediment from Northwest of China.

Abstract：

:Considerable studies have been done on heavy metal removing from aqueous solutions using loess. However, application of loess to heavy metal contaminated sediment is limited. The present study was to determine the effectiveness of loess to immobilize Cu, Zn, Cd and Pb in sediment. The loess was incubated with 10 kg wet sediment in doses of 0, 0.5, 1, 2, 5, 10 and 20 kg for 70 d and then subjected to the toxicity characteristic leaching procedure (TCLP). The possible mechanisms for heavy metal immobilization were illustrated using X-ray diffraction and scanning electron microscope. Results from TCLP confirmed loess reduced leaching rate of Cu and Zn achieving up to 42.4% and 17.6% reductions, respectively, when compared with untreated sediment. The loess could significantly immobilize Cu and Zn in sediment, and the optimum dose of loess in 10 kg wet sediment was 5 kg. However, loess was inefficient for Cd and Pb immobilization. Correlation analysis showed that TCLP extraction method could be used to predict the toxicity of Cu, Zn, Cd and Pb in the loess-amended sediment. The pH, EC, OM and CaCO3 of the loess-amended sediment played predominant roles in the TCLP leaching test.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Zang F,Wang S,Nan Z,Zhao C,Sun H,Huang W,Bao L

doi

10.1016/j.ecoenv.2019.109561

subject

Has Abstract

pub_date

2019-11-15 00:00:00

pages

109561

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(19)30892-9

journal_volume

183

pub_type

杂志文章

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