Determination of picomolar levels of iron in seawater using catalytic cathodic stripping voltammetry

被引：93

作者：

Obata, H ^{[1
]}

van den Berg, CMG ^{[1
]}

机构：

[1] Univ Liverpool, Oceanog Labs, Liverpool L69 7ZL, Merseyside, England

来源：

ANALYTICAL CHEMISTRY | 2001年 / 73卷 / 11期

关键词：

D O I：

10.1021/ac001495d

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new procedure for the direct determination of picomolar levels of iron in seawater is presented. Cathodic stripping voltammetry (CSV) is preceded by adsorptive accumulation of the iron(III) -2,3-dihydroxynaphthalene (DHN) complex from seawater, containing 20 muM DHN at pH 8.0, onto a static mercury drop electrode, followed by reduction of the adsorbed species. The reduction current is catalytically enhanced by the presence of 20 mM bromate. Optimized conditions include a 60-s adsorption period at -0.1 V and a voltammetric scan using sampled de modulation at 10 Hz, In these conditions, a detection limit of 13 pM iron in seawater was achieved which can be lowered further by extending the adsorption time to 300 s. The new catalytic CSV method is similar to5 times more sensitive than existing CSV methods and was tested on samples from the Atlantic Ocean.

引用

页码：2522 / 2528

页数：7

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