Thorium and iodine memory effects in inductively-coupled plasma mass spectrometry

被引:38
作者
Al-Ammar, A
Reitznerová, E
Barnes, RM
机构
[1] Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA
[2] Univ Massachusetts, Res Inst Analyt Chem, Amherst, MA 01002 USA
关键词
D O I
10.1007/s002160100837
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Thorium and iodine memory effects have been characterized experimentally for inductively-coupled plasma mass spectrometry by adding ammonia gas directly to the spray chamber and nebulizing aqueous ammonia sample solutions to assess analyte memory retention sites. Thorium memory effect originates from the tendency of an unidentified thorium compound to volatilize from the spray-chamber walls, and not from Th compound adsorption to nebulizer tubing. The mass spectrometer skimmer and sampler cones, ion optics, quadrupole, and other components are not responsible for the memory effect. Unlike that of thorium the iodine memory effect originates from adsorption of iodine compounds on nebulizer tubing surfaces and from volatilization of HI and I-2 from the spray-chamber walls. Addition of ammonia sample solutions or ammonia gas directly to the spray chamber eliminated the Th and I memory effects in practical analyses, and blank levels were achieved after 2 min wash-outs. Quantitative recoveries were obtained for Th and I in reference materials.
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页码:479 / 482
页数:4
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