工作场所空气中锡及其化合物测定的火焰原子吸收光谱法不确定度评定  

Evaluation of uncertainty for determination of tin and its compounds in air of workplace by flame atomic absorption spectrometry

作　　者：魏秋宁[1] 魏源 刘芳芳[1] 丁亚磊[1] 

机构地区：[1]宁夏疾病预防控制中心,750004 [2]宁夏宁东管委会环境监测站

出　　处：《中华劳动卫生职业病杂志》2015年第10期782-783,共2页Chinese Journal of Industrial Hygiene and Occupational Diseases

摘　　要：目的探讨火焰原子吸收光谱法测定工作场所空气中锡及其化合物测量结果的不确定度评定方法。方法采用国家职业卫生标准GBZ／T160．22—2004和JJF1059—1999的方法，建立工作场所空气中锡及其化合物测量的数学模型，对不确定度的分量进行计算。结果测定工作场所空气中锡及其化合物的火焰原子吸收光谱法中标准溶液浓度的不确定度为0．436％，原子吸收分光光度计的标准不确定度为0．13％，样品消解处理的不确定度为1．07％，样品平行测定引入的不确定度为1．65％，最小二乘法拟合校准曲线所产生的不确定度为3．05％，样品采集引入的不确定度为2．89％；合成标准不确定度为9．3％，检测样品中锡浓度为0．132mg／m2，测量扩展不确定度为0．012mg／m2（K=2）。结论测定工作场所空气中锡及其化合物不确定度的主要来源是最小二乘法拟合校准曲线所产生的不确定度和采样带来的不确定度，应加强校准曲线拟合及采样过程的质量控制。Objective To investigate the method for uncertainty evaluation of determination of tin and its compounds in the air of workplace by flame atomic absorption spectrometry. Methods The national occupational health standards, GBZ/T160.28-2004 and JJF1059-1999, were used to build a mathematical model of determination of tin and its compounds in the air of workplace and to calculate the components of uncertainty. Results In determination of tin and its compounds in the air of workplace using flame atomic absorption spectrometry, the uncertainty for the concentration of the standard solution, atomic absorption spectrophotometer, sample digestion, parallel determination, least square fitting of the calibration curve, and sample collection was 0.436%, 0.13%, 1.07%, 1.65%, 3.05%, and 2.89%, respectively. The combined uncertainty was 9.3%.The concentration of tin in the test sample was 0.132 mg/m3, and the expanded uncertainty for the measurement was 0.012 mg/m3 （K=2）. Conclusion The dominant uncertainty for determination of tin and its compounds in the air of workplace comes from least squares fitting of the calibration curve and sample collection. Quality control should be improved in the process of calibration curve fitting and sample collection.

关 键 词：火焰原子吸收光谱法 工作场所 锡及其化合物 不确定度 

分 类 号：R134.4[医药卫生—劳动卫生] O657.31[医药卫生—公共卫生与预防医学]