Study on determination and blank control chart of Lead,cadmium,chromium and arsenic in food by super microwave digestion-Inductively coupled plasma mass spectrometry
To establish a method for the determination of lead,cadmium,chromium and arsenic in food by super microwave digestion combined with Inductively coupled plasma mass spectrometry.The blank control chart was established by using the blank values accumulated 30 times when Teflon digestion tank was used for digestion,and the influence of quartz and glass digestion tank on the blank was analyzed.The results showed that the linear relationship of the four heavy metals was good(r>0.999 9),the detection limits were 0.000 1 mg/kg-0.03 mg/kg,and the quality control samples met the certificate reference value and the accuracy requirements of GB/T 27404-2008.The blank control chart can be used to monitor the dai-ly blank stability,and the system shows good stability when using quartz digestion tank,lead and arsenic blank exceeds up-per action limit when using glass digestion tank.The method is accurate,reliable and rapid,and quartz digestion tank can be used as a substitute for Teflon digestion tank.
Super microwave digestionICP-MSHeavy metalBlankFood
NETL
NSTL
万方数据
