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利用 2 6 6 nm紫外激光熔融电感藕合等离子体质谱仪 ,在最优化测试条件下 ,对标准玻璃样品 NIST6 12中的 30个微量元素进行了 5天 2 5组 78次的测定。在采用最小二乘法拟合后 ,选用 44 Ca为内标计算的数据精密度为 4%左右 ;选用 2 9Si为内标计算的数据精密度为 6 %左右。以 NIST6 12为外标 ,以 44 Ca和 2 9Si为内标 ,分别测定微量元素浓度为 45 0μg/g左右的NIST6 10 ,40μg/g左右的 NIST6 12以及微量元素浓度小于 1μg/g的 NIST6 14标准玻璃样品 ,与标样的标定值比较 ,数据的准确度绝大部分小于 10 %。以 NIST6 12为外标 ,选用 44 Ca为内标 ,根据测定 NIST6 12和 NIST6 10的数据的精密度推导 ,激光探针电感藕合等离子体质谱法测定浓度为 45 0 μg/g左右的微量元素时 ,数据的精密度小于 10 % ;测定浓度为 40 μg/g左右的微量元素时 ,大部分元素的数据精密度也在 10 %以下 ;以 NIST6 12为外标 ,选用 2 9Si为内标 ,根据测定 NIST6 12和 NIST6 14的数据的精密度推导 ,激光探针电感藕合等离子体质谱法测定浓度为 40μg/g左右的微量元素时 ,绝大部分元素的数据的精密度小于 15 % ;测定浓度大约在 0 .8μg/g左右的微量元素时 ,除 Ni,Sc,Rb,Zr,Sm ,Gd,Pb七个元素的精密度较差外 ,其余 2 3个元素的数据精密度在
Using 266 nm UV laser melting inductively coupled plasma mass spectrometry, 30 trace elements in standard glass sample NIST6 12 were tested in 25 groups, 25 groups and 78 measurements under the optimized test conditions. After fitting by the least square method, the data precision of selecting 44 Ca as internal standard is about 4%. The data precision of selecting 2 9 Si as internal standard is about 6%. Using NIST6 12 as external standard, 44 Ca and 29 Si as internal standard, NIST6 12 with a trace element concentration of 45 0 μg / g and NIST6 12 with a concentration of 40 μg / g and NIST6 14 with a trace element concentration of less than 1 μg / g Standard glass samples, compared with the standard calibration value, the accuracy of the vast majority of data less than 10%. Using NIST6 12 as external standard, 44 Ca was selected as the internal standard. According to the precision of NIST6 12 and NIST6 10 data, laser probe inductively coupled plasma mass spectrometry was used to determine trace elements with the concentration of 45 0 μg / g , The precision of the data was less than 10%. The data precision of most of the elements was below 10% when the concentration of trace elements was about 40 μg / g. With NIST6 12 as external standard and 29Si as internal standard, According to the precision of NIST6 12 and NIST6 14 data, when the laser probe inductively coupled plasma mass spectrometry was used to determine trace elements with the concentration of about 40 μg / g, the precision of the data of most of the elements was less than 15% At the concentration of about 0 .8 μg / g trace elements, the precision of the seven elements except Ni, Sc, Rb, Zr, Sm, Gd and Pb was poor,