摘要：

A modified BCR procedure for the chemical speciation of heavy metals,proposed by the Commission of the European has been applied to the Chinese reference material of soils(GSS-6,Gss-7 and GSS-16).Analyses were carried out by inductively coupled plasma atomic emission or graphite furnace atomic absorption spectrometry(ICP-AES or GFAAS).The fractions extracted were: acid exchangeable(extraction step 1),reducible(extraction step 2),oxidizable(extraction step 3).The sum of the element contents in the three fractions plus the residue was compared to the total content of t heavy metals in the Chinese reference material of soils.The recovery is in the range from 93.9% to 104%.The accuracy was checked by using BCR-701 from the Commission of the European,and the determined values conformed well to the standard values.

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