有机酸在电感耦合等离子体质谱中基体效应的研究  

The Matrix Effects of Organic Acid Compounds in ICP-MS

作　　者：聂西度[1] 何晓梅[1] 李立波[2] 谢华林[1] 

机构地区：[1]湖南工学院化工系,湖南衡阳421008 [2]中南大学化学化工学院应化系,湖南长沙410083

出　　处：《光谱学与光谱分析》2007年第7期1420-1423,共4页Spectroscopy and Spectral Analysis

基　　金：湖南省自然科学基金项目(05JJ40017);湖南省教育厅优秀青年科研项目(05B064)资助

摘　　要：研究了乙二酸、乳酸、酒石酸和柠檬酸等有机试剂对不同质量和不同电离电位元素电感耦合等离子体质谱信号的影响。结果表明,随着雾化气流速的调节,低浓度有机酸介质对所分析元素具有增强效应,尤其是对电离电位在9~11 eV的Be,Zn,As,Se,Sb和Hg等高电离电位元素的影响。酒石酸的增强效应显著大于乙二酸、乳酸、柠檬酸。探讨了有机酸的增强机理。利用酒石酸对Be,Zn,As,Se,Sb和Hg等的增强特性,测定了水标准物质SRM 1640中的Be,Zn,As,Se,Sb和SRM 1641d中Hg,其测定结果与标准样品提供的标准值基本一致。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.

关 键 词：乙二酸 乳酸 酒石酸 柠檬酸 电感耦合等离子体质谱 增强效应 

分 类 号：O657.6[理学—分析化学]