Issue 6, 2011
From the journal:

Journal of Analytical Atomic Spectrometry

Application of ion molecule reaction to eliminate WO interference on mercury determination in soil and sediment samples by ICP-MS

Wei Guo,a   Shenghong Hu,*a   Xiuji Wang,ab   Jiangyi Zhang,c   Lanlan Jin,a   Zhenli Zhua  and  Hongfei Zhanga  

* Corresponding authors

a Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, Faculty of Earth Sciences, China University of Geosciences, Wuhan, PR China
E-mail: shhu@cug.edu.cn
Fax: (+86) 27-67883456
Tel: (+86) 27-67883495

b Guangdong Medical College, Zhanjiang, PR. China

c Engineering Geology and Water Resources Department, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, PR. China

Abstract

Mercury is subject to severe tungsten oxide (WO) interference in the direct ICP-MS analysis for soil or sediment samples. In this study, a method based on ion molecule reaction (IMR) was used to eliminate the WO spectral interference in a dynamic reaction cell (DRC). Interfered ion (202WO+) was drastically oxidized to higher oxide ions (218WO2+ or 234WO3+) by O2 as the reaction gas in the DRC, while the analyte ion (202Hg+) cannot react with O2. Under the optimized O2 flow rate (1.9 mL min−1) and DRC rejection parameter q (Rpq, 0.80), the background signal was reduced by up to 1000-fold at m/z 202 and the limit of quantitation (LOQ, 10σ) for 202Hg was 1 ng g−1. The proposed method was applied to direct determination of Hg in a series of soil and sediment standard reference materials (SRMs) and the satisfactory results indicate that it has great potential for the determination of trace or ultra-trace level mercury in various environmental or geological samples.

Graphical abstract: Application of ion molecule reaction to eliminate WO interference on mercury determination in soil and sediment samples by ICP-MS

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Article information

DOI
https://doi.org/10.1039/C1JA00005E
Article type
Paper
Submitted
05 Jan 2011
Accepted
16 Feb 2011
First published
11 Mar 2011

J. Anal. At. Spectrom., 2011,26, 1198-1203

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Application of ion molecule reaction to eliminate WO interference on mercury determination in soil and sediment samples by ICP-MS

W. Guo, S. Hu, X. Wang, J. Zhang, L. Jin, Z. Zhu and H. Zhang, J. Anal. At. Spectrom., 2011, 26, 1198 DOI: 10.1039/C1JA00005E

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