Evaluation of Ethene Addition to the Nebulizer Gas in Inductively Coupled Plasma-Mass Spectrometry for the Removal of Matrix-, Solvent-, and Support-Gas-Derived Polyatomic Ion Interferences
Evaluation of Ethene Addition to the Nebulizer Gas in Inductively Coupled Plasma-Mass Spectrometry for the Removal of Matrix-, Solvent-, and Support-Gas-Derived Polyatomic Ion Interferences
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DOI：
10.1366/000370294775269018
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发表时间：
1994-04
影响因子：
3.5
通讯作者：
L. Ebdon;M. Ford;R. Hutton;S. Hill
中科院分区：
文献类型：
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作者：
L. Ebdon;M. Ford;R. Hutton;S. Hill
雾化器气体中加入乙烯作为降低ICP-MS中多原子离子水平的一种手段进行评估。结果发现，与全氩等离子体相比，虽然添加乙烯后分析物的绝对响应通常较差，但干扰水平大大降低。为了去除或减少ArO+、ArCl+、ClO+、CeO+、ArNa+、SO2+/S2+和PO2+的干扰，使用变步长Simplex程序优化了在雾化气体中添加乙烯的等离子体操作条件。实现了对ArCl+、ArNa+、SO2+/S2+和PO2+的完全去除，同时大大降低了剩余干扰的水平。10% HCl溶液中As、Se和V的检出限极好（分别为0.27、2.7和2.04 ng cm−3），1% H3PO4溶液中Cu的检出限为6.9 ng cm−3。在H2SO4和钠离子存在下，Cu、Ni、Zn的检出限也有所提高，Fe的检出限为0.48 ng cm−3。相对于Ce， CeO+的水平降至仅0.2%。回收率试验和标准物质分析进一步证明了最佳条件的实用性。确定了一套折衷的乙烯条件，并证明了在减少干扰的同时具有价值。
Ethene addition to the nebulizer gas is assessed as a means of reducing the levels of polyatomic ions in ICP-MS. It was found that, while the absolute analyte response was generally poorer with the addition of ethene, the levels of the interferences were greatly reduced, when compared to the all argon plasma. The plasma operating conditions, with the addition of ethene to the nebulizer gas, were optimized with the use of a variable-step-size Simplex procedure in order to remove or reduce the ArO+, ArCl+, ClO+, CeO+, ArNa+, SO2+/S2+, and PO2+ interferences. Complete removal of the ArCl+, ArNa+, SO2+/S2+, and PO2+ was achieved, while the levels of the remaining interferences were very much reduced. Detection limits for As, Se, and V in 10% HCl were excellent (0.27, 2.7, and 2.04 ng cm−3, respectively), as was the detection limit for Cu in 1% H3PO4 at 6.9 ng cm−3. Cu, Ni, and Zn detection limits in the presence of H2SO4 and sodium ions were also improved, and the detection limit for Fe was 0.48 ng cm−3. Levels of CeO+ were reduced to just 0.2% relative to Ce. Recovery tests and the analysis of certified reference materials further demonstrated the utility of the optimal conditions. A set of compromise ethene conditions was identified and shown to be of value in reducing the interferences simultaneously.