A flow system for the determination of metal speciation in soil by sequential extraction

被引：44

作者：

Shiowatana, J ^{[1
]}

Tantidanai, N ^{[1
]}

Nookabkaew, S ^{[1
]}

Nacapricha, D ^{[1
]}

机构：

[1] Mahidol Univ, Fac Sci, Dept Chem, Bangkok 10400, Thailand

来源：

ENVIRONMENT INTERNATIONAL | 2001年 / 26卷 / 5-6期

关键词：

atomic absorption; flow; metal speciation; sequential extraction; soil;

D O I：

10.1016/S0160-4120(01)00016-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A flow extraction system with on-line acid off-line flame atomic absorption spectrometric (FAAS) detection was developed to speed up, facilitate. and improve the accuracy of sequential extraction for metal speciation in solid materials. A flow extraction system with off-line detection was more advantageous than the on-line detection. In the proposed system, extraction was performed in a closed extraction chamber where extractants were newing through sequentially. The extract from each extraction was collected in 4-10 fractions to obtain a total of approximately 180 ml for subsequent FAAS determination. The system is simple, easy to construct and operate. It has less risk of contamination and human error. A widely used three-step sequential extraction scheme was used to evaluate the novel system by analyzing Ca, Fe. Mn, Cu, and Zn in a certified reference material. The extraction time for three-step sequential extraction of soil sample was 4 h. The analytical results for Ca, Fe, Mn, Cu, and Zn of a soil certified reference material using the proposed system were compared with those of the conventional batch extraction. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：381 / 387

页数：7

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