电感耦合等离子体质谱法测定金属锂中6种元素

Determination of six elements in lithium metal by inductively coupled plasma mass spectrometry

建立电感耦合等离子体质谱(ICP-MS)法同时测定金属锂中的钛、铬、锰、镍、钡和铅6种杂质元素。样品用硝酸消解,在线加入混合内标元素,根据待测元素的质荷比不同以ICP-MS技术进行分离,经质量分析器和检测系统,测试质谱的信号强度对元素进行定量分析。6种杂质元素适用于He模式下检测,样品酸度确定为0.15 mol/L。6种元素的质量浓度在1~100μg/L范围内与离子强度线性关系良好,相关系数均大于0.999,钛,铬,锰,镍,钡和铅元素检出限分别为0.059,0.065,0.048,0.074,0.062,0.071μg/L,测定结果的相对标准偏差为1.56%~3.94%,加标回收率为91.7%~109.4%。该法操作简便、灵敏度高、准确度高,适用于金属锂中6种杂质元素的测定,提高了分析效率和检测水平。

An inductively coupled plasma mass spectrometry(ICP-MS)was established for the simultaneous determination of 6 impurity elements of titanium,chromium,manganese,nickel,barium,plumbum in lithium metal.Sample digestion with nitric acid and added internal standard elements online.ICP-MS separated the elements according to mass-to-charge ratio.Mass spectrometer and detection system detected signal intensity of mass spectrum to quantitative analysis for elements.Six kinds of impurity elements applied to He mode,and acidity of sample was 0.15 mol/L.The mass concentration of six elements had a good linear relationship with ion strength in the range of 1-100μg/L,and correlation coefficient than 0.999,the detection limits of titanium,chromium,manganese,nickel,barium,plumbum were 0.059,0.065,0.048,0.074,0.062,0.071μg/L,respectively,the relative standard deviation of detection of results was 1.56%-3.94%,the recovery was 91.7%-109.4%.The method is simple,high sensitivity and high accuracy.It is suitable for determination of six impurity elements in lithium metal,which improve analysis efficiency and detection level.