摘要
利用电感耦合等离子体质谱法(ICP-MS)测定土壤中砷的含量。样品经过微波消解,在线加入内标校正基体效应,通过修正方程校正质量数干扰。测定砷元素校正曲线的相关系数0.9999,检出限0.01mg/kg,样品分析结果的变异系数为1.6%～2.4%(n=6),加标回收率在84.0%～96.8%。同时采用国家标准方法氢化物-原子荧光光度法验证了方法的准确度,两种方法结果无显著差异。实验结果表明,该方法具有简单、快速、检出限低等特点,可用于土壤中砷含量的测定和监控。
Arsenic content in soil was determined by inductively coupled plasma-atomic-mass spectrometry （ICP-MS）. Microwave digestions were carried out in PTFE（Teflon）closed vessels with HNO3 and H2O2. The details of treatment of samples and working parameters of the instrument were described. The matrix effect was corrected by the in-line addition of internal standards, and the mass number interference was amended by correcting equation. Satisfactory linearity of working curve is obtained with the 0.999 9 correlation coefficient. Detection limit of Arsenic element is found at 0.001 mg/kg. CV （n=6）in the range of 1.6%- 2.4% and recoveries from 84.0% to 96.8% are obtained in its application for the assay of samples. Comparing the results obtained by ICP-MS with those by the national standard method atomic fluorescence spectrometry（AFS ）, it can be concluded that the ICP-MS method is simple, rapid and sensitive, and can be applied to determine arsenic content in soil samples.
出处
《当代化工》
CAS
2010年第1期100-101,105,共3页
Contemporary Chemical Industry
