Optimization of Soil Heavy Metal Sequential Extraction Procedures

Abstract

Abstract:

The environmental risks of heavy metals depend on its speciation distribution in contaminated soils. The chemical speciation analysis was one of the hot topics in environmental sciences. In recent years, the most popular sequential extraction procedures were Tessier and BCR. Nethier Tessier nor BCR sequential extraction methods considered the characteristics of soil samples. Although Toxicity Characteristic Leaching Procedure (TCLP) used two different extraction regent is based on the pH values of soil samples, it is a single step extraction method. In this paper, compared with Tessier, BCR and TCLP extraction techniques, the speciation extraction method was optimized in order to adapt soils with different pH values. The heavy metals in the soils were divided into active fraction, secondary carbonate fraction, secondary steady fraction and steady fraction. The results show that the optimized sequential extraction method is more stable, the recovery rate is 85% to 115% which could satisfy the soil speciation evaluation requirements. And the optimized sequential extraction method is suitable for soils with different pH values.

Key words: heavy metal, speciation analysis, sequential extraction procedure, optimization

CLC Number:

X53
R124

LIU Dan-dan，LIU Fei ，MIAO De-ren. Optimization of Soil Heavy Metal Sequential Extraction Procedures[J]. Geoscience, 2015, 29(2): 390-396.

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Optimization of Soil Heavy Metal Sequential Extraction Procedures

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