气相色谱法测定水中硝基苯的不确定度评估

Evaluation of Uncertainty of Measuring the Nitrobenzene in Water by Gas Chromatography

[目的]评估气相色谱法测定水中硝基苯的不确定度。[方法]依据GB/T 13194-1991用气相色谱法对水中硝基苯的含量进行测定,全面系统地分析了影响其测定的不确定度的各种因素,建立了测量过程中各分量的数学模型,估算各不确定度分量对总不确定度的影响,确定测量结果的包含区间。[结果]试验得出,标准溶液配置过程是影响气相色谱法测定水中硝基苯的不确定度的主要因素,仪器重复测定带来的不确定度可以忽略不计。[结论]研究得出的对测定结果不确定度影响的主要因素,在测定时应该予以重视。

[ Objective ] To evaluate the uncertainty of measuring the nitrobenzene in water by gas chromatography. [ Method ] The content of ni- trobenzene in water was determined by gas chromatography based on the GB/T 13194 - 1991. The various factors influencing the detection were comprehensively and systematically analyzed. The mathematical model of each component was established in the determination process. The in- fluence of each uncertain component was evaluated to confirm the region of the detection result. [ Result ] It was concluded that the configuration procedure of the standard solution is the main factor that affect the detection of the content of nitrobenzene by the gas chromatography. The uncer- tainty of measurement caused by the repeated detection of the instrument can be ignored. ？ [ Conclusion ] We should pay more attention to the main influencing factors for the uncertainty.