Evaluation of a method for identification of host physico-chemical phases for trace metals and measurement of their solid-phase partitioning in soil samples by nitric acid extraction and chemometric mixture resolution

被引：45

作者：

Cave, MR ^{[1
]}

Milodowski, AE ^{[1
]}

Friel, EN ^{[1
]}

机构：

[1] British Geol Survey, Nottingham NG12 5GG, England

来源：

GEOCHEMISTRY-EXPLORATION ENVIRONMENT ANALYSIS | 2004年 / 4卷 / 01期

关键词：

metal partitioning; contaminated soil; centrifugation; extraction; chemometric data processing; nitric acid;

D O I：

10.1144/1467-7873/03-025

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A sequential extraction methodology, designed to measure the solid phase partitioning of metals in soils and sediments, is described. The method uses centrifugation to pass increasing concentrations of HNO3 through the sample, followed by ICP-AES analysis of major and trace elements of the extracts. A data-processing algorithm is used to identify the number of physico-chemical components extracted, their composition and the proportion of each in each extract. The algorithm has been successfully tested on a synthetic data set and the combination of the extraction methodology and data-processing algorithm have been tested on a contaminated soil sample (NIST SRM 2710). The 14 extracts from each duplicate experiment were analysed for 19 elements and data analysis identified nine chemically distinct soil components: pore-water residual solutes; organic, easily exchangeable; a Cu-Zn dominated phase; a Pb-dominated phase; amorphous Fe oxide/oxyhydroxide; crystalline Fe oxide; Fe-Ti oxide; and Mn oxide.

引用

页码：71 / 86

页数：16

共 44 条

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