ARTIFACTS IN THE DETERMINATION OF TRACE-METAL BINDING FORMS IN ANOXIC SEDIMENTS BY SEQUENTIAL EXTRACTION

被引：70

作者：

WALLMANN, K ^{[1
]}

KERSTEN, M ^{[1
]}

GRUBER, J ^{[1
]}

FORSTNER, U ^{[1
]}

机构：

[1] UNIV TECHNOL HAMBURG HARBURG,DEPT ENVIRONM SCI & ENGN,W-2100 HAMBURG 90,GERMANY

来源：

INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY | 1993年 / 51卷 / 1-4期

关键词：

SEQUENTIAL EXTRACTION; SPECIATION; ANOXIC SEDIMENTS; CADMIUM; COBALT; COPPER; LEAD; ZINC;

D O I：

10.1080/03067319308027624

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The binding forms of Co, Cd, Cu, Pb, and Zn in an anoxic, sulfide-bearing sediment were investigated by performing both thermodynamic equilibrium calculations and sequential extractions. Care was taken to maintain oxygen-free conditions during the whole experiment. The calculations suggested that trace metals were bound to sulfidic minerals. Sequential extraction results, however, showed increased importance of exchangeable and reducible fractions in the order Cu < Cd < Pb < Zn < Co. Thermodynamic equilibrium calculations of the chemical reactions during extraction showed that Cd, Co, Pb, and Zn sulfides are to a significant extent soluble in the acetate-exchangeable (step 1 + 2) and oxalate-reducible (step 3) fractions. Neglecting the dissolution of sulfide minerals would lead to a misinterpretation of the experimental results.

引用

页码：187 / 200

页数：14

共 45 条

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