Application of ion molecule reaction to eliminate WO interference on mercury determination in soil and sediment samples by ICP-MS
Application of ion molecule reaction to eliminate WO interference on mercury determination in soil and sediment samples by ICP-MS
复制标题
应用离子分子反应消除WO对ICP-MS测定土壤和沉积物样品中汞的干扰
DOI：
10.1039/c1ja00005e
复制
发表时间：
2011-01-01
影响因子：
3.4
通讯作者：
Zhang, Hongfei
中科院分区：
文献类型：
--
作者：
Guo, Wei;Hu, Shenghong;Zhang, Hongfei
在土壤或沉积物样品的直接ICP-MS分析中，汞会受到氧化钨（WO）的严重干扰。本文采用离子分子反应（IMR）方法消除动态反应池（DRC）中WO光谱干扰。干扰离子（202 WO+）在DRC中被作为反应气体的O2急剧氧化为更高的氧离子（218 WO 2+或234 WO 3+），而分析物离子（202 Hg+）不能与O2反应。在优化的O2流速（1.9 mL min−1）和DRC拒绝参数q（Rpq，0.80）下，背景信号在m/z 202处降低高达1000倍，202 Hg的定量限（LOQ，10σ）为1 ng g−1。该方法用于土壤和沉积物标准物质中汞的直接测定，结果令人满意，表明该方法在环境和地质样品中痕量和超痕量汞的测定中具有很大的应用潜力。
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.