Use of a solution cathode glow discharge for cold vapor generation of mercury with determination by ICP-atomic emission spectrometry

Analytical Chemistry
Zhenli ZhuGary M Hieftje

Abstract

A novel vapor-generation technique is described for mercury determination in aqueous solutions. Without need for a chemical reducing agent, dissolved mercury species are converted to volatile Hg vapor in a solution cathode glow discharge. The generated Hg vapor is then transported to an inductively coupled plasma for determination by atomic emission spectrometry. Mercury vapor is readily generated from a background electrolyte containing 0.1 M HNO 3. Vapor generation efficiency was found to be higher by a factor of 2-3 in the presence of low molecular weight organic acids (formic or acetic acids) or alcohols (ethanol). Optimal conditions for discharge-induced vapor generation and reduced interference from concomitant inorganic ions were also identified. However, the presence of chloride ion reduces the efficiency of Hg-vapor generation. In the continuous sample introduction mode, the detection limit was found to be 0.7 microg L (-1), and repeatability was 1.2% RSD ( n = 11) for a 20 microg L (-1) standard. In comparison with other vapor generation methods, it offers several advantages: First, it is applicable to both inorganic and organic Hg determination; organic mercury (thiomersal) can be directly transformed into volatile H...Continue Reading

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Sep 11, 2007·Analytical Chemistry·Michael R WebbGary M Hieftje

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Citations

Oct 28, 2015·The Analyst·Xiaohan XuChunying Chen
May 15, 2010·Analytical Chemistry·Nicolas H BingsJosé A C Broekaert
Jun 12, 2021·Journal of Hazardous Materials·Sibei HaoShun Mao
Nov 12, 2021·Analytical Methods : Advancing Methods and Applications·Jingheng NingYongle Liu
Nov 16, 2021·Luminescence : the Journal of Biological and Chemical Luminescence·Yalei LiuYufang Hu

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