Simultaneous determination of 16 elements in tea by nitric acid extraction inductively coupled plasma mass spectrometry
Establish the optimal determination method for 16 elements including Pb,Cd,As,Cu,Zn,Cr,Co,Mo in tea by nitric acid extraction microwave digestion inductively coupled plasma mass spectrometry(ICP-MS).After microwave digestion of the tea standard substance GBW10052a(GSB-30a),the standard curve method combined with online addition of internal standard solution was used to simultaneously determine the content of 16 elements in collision mode using external standard method and standard addition method.The influence of the tea matrix on the quantitative analysis of the measured elements was studied.The results showed that this method can simultaneously determine multiple elements,with a wide linear range.The correlation coefficient R2 of the measured elements is 0.998-1.000.The recovery rates of the three concentration levels added are 88.56%-120.24%,with a relative standard deviation of 0.72%-2.67%.The detection limit of the method is 0.001-0.200 mg·kg-1.The standard addition method can effectively eliminate the interference of the matrix and can be used for the detection of heavy metal elements in daily tea samples.
teanitric acidinductively coupled plasma mass spectrometrymicrowavedigestion
万方数据
维普
