纳氏试剂分光光度法测定公共场所空气中氨的不确定度评定

Uncertainty Evaluation of Determination of Ammonia in The Air in Public Places with Nessler Reagent Spectrophotometric

分析了应用纳氏试剂分光光度法GB/T18204.25-2000测试公共场所空气中氨过程中不确定度的影响因素,其主要来源为标准溶液、标准曲线拟合、样品重复测定、分光光度计、取吸收液体积和采集气样气体标干体积这六部分引入的不确定度。本次测量结果为:0.213±0.022 mg/m3,k=2。(约95%置信水平)

The paper analyses influencing factors of uncertainty in the application of Nessler reagent spectrophotometry GB / T18204.25-2000 in air testing of ammonia in public places.The main sources of uncertainty includes standard solution,standard curve fitting,repeated measurements of the sample,spectrophotometricphotometer,absorbing fluid volume and standard dry volume of collecting gas samples.The results of the measurement: 0.213 ± 0.022 mg / m3,k = 2.(Approximately 95% confidence level)