Taking alkaline solution digestion as the pre-treatment method,the optimal digestion conditions are determined through exploring the sample pre-treatment conditions such as magnesium chloride addition way,digestion temperature,and digestion time.The appropriate internal standard elements and interference deductions are selected out,and an analytical method is established for rapid determination of hexavalent chromium in soil by inductively coupled plasma mass spectrometry.The mass concentration of hexavalent chromium is linearly related to the corresponding signal intensity within 1.0 mg·L-1,with a correlation coefficient of 0.999 9.The detection limit of the method is 0.11 mg·kg-1,and the lower limit of the determination is 0.44 mg·kg-1.According to the experimental method,hexavalent chromium in China's national standard substances is determined,and the measured value is consistent with the recognized value.The relative standard deviation(n=6)is 0.98％-2.81％.By conducting spiked recovery experiments on actual samples,the spiked recovery rate ranges from 94％to 105％.The established determination method has good stability and high accuracy,suitable for the analysis of trace hexavalent chromium in soil samples.
关键词
碱溶液消解/电感耦合等离子体质谱法/土壤/6价铬
Key words
alkaline solution digestion/inductively coupled plasma mass spectrometry/soil/hexavalent chromium
维普
万方数据