Determination of Selenium in celery,cabbage,chicken and liver with Isopropanol as matrix modifier by micorowave digestion- inductively coupled plasma mass spectrometry

Objective: With Isopropanol as matrix modifier,the determination of selenium in celery,cabbage,chicken and liver by microwave digestion- ICP- MS was established.Method: 6 m L nitric acid and 2 m L hydrogen peroxide were added to samples for digestion by micorowave,Selenium content in samples was determined by ICP- MS collision cell technology,with 2% isopropanol as a matrix modifier,with germanium as internal calibration.Results:The fitting coefficient of the method was 1.0000,the detection limit was 0.3 μg / kg,the limit of quantification was1 μg / kg. Selenium content in certified reference materials were determined by this method,the results were in the range of the certificate value.This method had good linearity,low detection limit,accurate and reliable,can be used for accurate determination of selenium in food.