目的建立工作场所空气锆及其化合物的测定不确定度数学模型,量化各不确定度分量,为职业卫生检测机构实验室质量体系管理提供资料。方法分析工作场所空气锆及其化合物的测定过程中各种不确定度的影响因素。其不确定度主要由标准溶液、标准曲线拟合、分光光度计、样品重复测定、吸收液体积和采集气体样品标准体积这六部分引入。结果本次工作场所空气锆及其化合物的测定结果为0.256±0.010 mg/m3,k=2(包含概率约为95%)。合成相对不确定度为2.1%,扩展不确定度为0.010 mg/m3。结论大气采样器流量计和分光光度计相对示值误差所引入不确定度为本测量最主要不确定度来源。 Objective To establish a mathematical model for the determination of zirconium and its compounds in the workplace and to quantify the components of each uncertainty for the purpose of providing information for the laboratory quality management system of occupational health testing institutes. Methods The influencing factors of various uncertainties in the determination of zirconium and its compounds in the workplace were analyzed. The uncertainty is mainly introduced by six parts: standard solution, standard curve fitting, spectrophotometer, repeated sample determination, absorption liquid volume and standard volume of gas sample collection. Results The zirconium and its compounds in the workplace were determined to be 0.256 ± 0.010 mg / m3 with k = 2 (95% probability). The relative uncertainty of synthesis was 2.1% and the extended uncertainty was 0.010 mg / m3. Conclusion The uncertainty introduced by the relative indication errors of the sampler flowmeter and the spectrophotometer is the most important source of uncertainty for this measurement.