Removal of interferences in the speciation of chromium using an octopole reaction system in ion chromatography with inductively coupled plasma mass spectrometry

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• 作者：ZuLiang Chen ; Mallavarapu Megharaj ; Ravendra Naidu
• 关键词：Chromium speciation ; Collision reaction cell ; IC– ; ICPMS ; Contaminated water
• 刊名：Talanta
• 出版年：2007
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：31 October 2007
• 卷：73
• 期：5
• 页码：948-952
• 文件大小：533 K

摘要

When inductively coupled plasma mass spectrometry (ICP-MS) is used for the detection of ⁵²Cr (83.8%) species in ion chromatography (IC), interference from polyatomic ions such as ⁴⁰Ar¹²C⁺ and ³⁵Cl¹⁶O¹H⁺, often occurs due to their mass at m/z 52. To address the issue, an octopole reaction system (ORS) in ICP-MS, including He and H₂ modes, was used to determine whether the background and interference from polyatomic ions could be reduced in the detection of ⁵²Cr. Compared to standard mode, the polyatomic ions were reduced by either He or H₂; for example, more than 97 and 98%of ³⁵Cl was removed using a He and H₂ tune, respectively. However, the detection sensitivity for ⁵²Cr was decreased, for example, the sensitivity was 27.95 and 67.02%of the standard mode for Cr(EDTA)₂⁻using a He and H₂ tune, respectively. The H₂ tune is recommended for the detection of ⁵²Cr at a flow rate of 2.0 mL/min with detection limits in the range of 0.2–0.4 μg/L. The developed method was used to measure chromium speciation in waters containing high concentration of chloride.