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REDUCTION OF POLYATOMIC ION INTERFERENCES IN INDUCTIVELY COUPLED PLASMA MASS-SPECTROMETRY BY CRYOGENIC DESOLVATION
被引:75
作者:
ALVES, LC
WIEDERIN, DR
HOUK, RS
机构:
[1] IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011
[2] IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011
关键词:
D O I:
10.1021/ac00034a016
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
Multiple desolvation steps at -80-degrees-C for a continuous-flow ultrasonic nebulizer reduced the load of water and HCl on an argon Inductively coupled plasma (ICP). Consequently, the oxide ratios MO+/M+ for Ca, Mo, and La were 0.02-0.05%. Polyatomic ion interferences from ArO+, ClO+, and ArCl+ were also reduced by several orders of magnitude. Measured isotope ratios for Ni, Cd, and Fe were in good agreement with accepted natural values, and the detection limits were 2-20 ng L-1 for Ni, Fe, V, As, and Cd in the presence of concentrated matrices of HCI, Ca, or Mo that would normally cause polyatomic ion interference. Eight additional seconds were necessary for sample rinse-out, and analyte sensitivity was reduced by a factor of 2 when cryogenic desolvation was used. UO+/U+ ratios were reduced to 0.06% when cryogenic desolvation was used and acetylene was added to the central channel. Sodium matrices up to 100 mg L-1 decreased the La+ count rate but did not affect the oxide ratio LaO+/La+. At 1000 mg L-1 NaCl the LaO+/La+ ratio increased to 0.08%.
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页码:1164 / 1169
页数:6
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