| 光谱学与光谱分析 |
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| The Matrix Effects of Organic Acid Compounds in ICP-MS |
| NIE Xi-du1,HE Xiao-mei1,LI Li-bo2,XIE Hua-lin1* |
1. Department of Chemical Engineering,Hunan Institute of Technology,Hengyang 421008,China
2. School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China |
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Abstract The matrix effects arising from oxalic acid,lactic acid,tartaric acid and citric acid in inductively coupled plasma mass spectrometry (ICP-MS) were investigated. It has been proved that the sensitivity of analytes can be significantly enhanced by adding small amounts of organic acid compounds with adjusted nebulizer gas flow-rate,especially for the elements with ionization potential between 9 and 11 eV. The tartaric acid has higher enhancement effect on the signal intensity of the hard-to-ionize elements than oxalic acid,lactic acid and citric acid. The mechanism of the enhancement was investigated. The method has been used to determine Be,Zn,As,Se,Sb and Hg in water standard reference materials (SRM). The analytical results are very close to the certified values.
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Received: 2006-05-28
Accepted: 2006-09-02
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Corresponding Authors:
XIE Hua-lin
E-mail: hualinxie@vip.163.com
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