Study on collision/reaction for multielement interference in determination of selenium by inductively coupledplasma mass spectrometry and its application to geological sample
CHENG Xiu-hua, WANG Hai-rong, LI Wei-liang, WANG Peng
Xi’an Center of Geological Survey, China Geological Survey, Xi’an 710054,China
Abstract：The interference of polyatomic ions generated from a lot of argon in plasma could not be neglectedduring the determination of selenium by inductively coupled plasma mass spectrometry (ICP-MS) under normal mode. As a result,the accurate determination of selenium became a difficult problem.The collision gas flow rate was controlled at 4.5 mL/min, the carrier gas flow rate was controlled at 0.85 mL/min, and the ICP power was 1 300 W. The collision/reaction mode was adopted, and the interference of polyatomic ions was reduced with hydrogen-helium mixture (volume ratio of 7∶93) as collision gas and 80Se as determination isotope. Consequently, a method was established for determination of selenium in geological samples by ICP-MS. The detection limit of method was 0.08 μg/g under optimal experimental conditions. The content of selenium in geological certified reference materials (including GBW07106, GBW07401 and GBW07404) and actual samples was determined according to the experimental method. The results were basically consistent with the certified values or those obtained by standard method NY/T1104-2006. The relative standard deviations (RSD, n=5) were less than 6.0%.
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CHENG Xiu-hua, WANG Hai-rong, LI Wei-liang, WANG Peng. Study on collision/reaction for multielement interference in determination of selenium by inductively coupledplasma mass spectrometry and its application to geological sample. , 2015, 35(12): 5-9.
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