A method for screening total mercury in water using a flow injection system with piezoelectric detection

被引：39

作者：

Manganiello, L

Ríos, A

Valcárcel, M ^{[1
]}

机构：

[1] Univ Cordoba, Fac Sci, Div Analyt Chem, E-14004 Cordoba, Spain

[2] Univ Carabobo, Fac Engn, Chem Res Ctr, Barbula, Carabobo, Venezuela

来源：

ANALYTICAL CHEMISTRY | 2002年 / 74卷 / 04期

关键词：

D O I：

10.1021/ac010919g

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An automatic microgravimettic screening system based on piezoelectric detection and the use of acidic stannous chloride as reductant was developed for the fast detection and determination of total mercury in water. Reduced mercury is detected as an amalgam by using a gold-coated piezoelectric crystal, the sensor subsequently being regenerated by passing it through a peroxydisulfate solution. The gold-coated piezoelectric crystal is a highly efficient retention unit for the main soluble mercury species (inorganic, complexed, and organometallic) previously reduced to elemental mercury and is free of interferences from other metal ions. This detector exhibits good sensitivity: it allows the determination of mercury at sub-parts-per-billion concentration levels (0.30-1.00 mug/L). The precision, expressed as relative standard deviation, was 2.7% (n = 11; P = 0.05) at 0.5 mug/L total mercury. The proposed method was successfully used as a rapid screening method for mercury monitoring in natural waters.

引用

页码：921 / 925

页数：5

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