Analysis of Selenium in Selenium-Rich Agricultural Products by ICP-MS with Dynamic Reaction Cell
In order to reduce the loss of selenium in selenium-rich agricultural product samples during the pre-treatment process,to enhance the sensitivity of determination,and to eliminate multi-atomic ion interference during mass spectrometry analysis,a detection method for selenium content in selenium-rich agricultural products using microwave digestion combined with dynamic reaction cell inductively coupled plasma mass spectrometry(DRC-ICP-MS)is established.Ethanol is used as a sensitizer,and methane is used as the reaction gas.By optimizing the methane flow rate,low mass cutoff(RPq),and the ratio of ethanol,the mass spectrometry interference during the test is effectively eliminated.Experimental results show that when 80Se is the target analyte,with a methane reaction gas flow rate of 0.6 mL/min,an RPq of 0.5,and an ethanol addition ratio of 4％,the method's detection limit is 0.002 mg/kg.The recovery rates of selenium content determination in mushroom powder cumin powder and tea standard materials are between 91％and 108％.The differences of the results of Se in actual samples determined by DRC-ICP-MS and atomic fluorescence spectrometry are not significant.This method has a good application prospect in the determination of selenium content in selenium-rich agricultural products.
万方数据
维普
