摘要
为评定分光光度法检测空气中NO_(2)浓度的不确定度,找出影响测量结果的最大因素。本研究建立了测量数学模型,依据JJF 1059.1—2012《测量不确定度评定与表示》对测量过程的不确定度来源进行量化评估。结果表明,采样体积和曲线查得NO_(2)-含量对测量结果影响较大,使用合格标准物质和检定/校准合格的仪器设备,并规范采样及分析测定过程可降低不确定度,提高测量结果的准确性。空气中NO_(2)浓度为0.041 mg/m^(3),扩展不确定度为0.003 mg/m^(3)(置信区间95%,k=2),该方法不确定度较小,适用于空气中NO_(2)浓度测量。
To evaluate the uncertainty in detecting nitrogen dioxide concentration in air by spectrophotometry and identify the most significant factors affecting measurement results,a mathematical model for measurement was established,and uncertainty sources during the measurement process were quantitatively assessed according to JJF 1059.1—2012"Evaluation and Expression of Uncertainty in Measurement".The results showed that sampling volume and nitrite ion content obtained from the calibration curve had a significant impact.Using certified reference materials(CRMs),properly calibrated instruments,and standardized sampling/analytical procedures can reduce uncertainty and improve measurement accuracy.The NO_(2)concentration in air was 0.041 mg/m^(3),with an expanded uncertainty of 0.003 mg/m^(3)(95%confidence interval,k=2).This method demonstrates relatively low uncertainty and is suitable for measuring nitrogen dioxide concentrations in the air.
作者
卢变芳
LU Bianfang(Shanghai Xintiandi Testing Technology Co.,Ltd.,Shanghai,200444,China)
出处
《质量安全与检验检测》
2025年第6期13-17,共5页
QUALITY SAFETY INSPECTION AND TESTING
关键词
NO_(2)浓度
分光法
测量不确定度
Concentration of nitrogen dioxide
Spectrophotometry
Measurement uncertainty
