离子色谱法测定环境空气PM2.5中硫酸根离子浓度不确定度评定  

Evaluation of uncertainty for the determination of sulfate ion concentration in ambient air PM2.5 by ion chromatography

作　　者：吴梦溪[1] 曾晖[1] 张颖[1] 相倩倩 邓颖 黄文耀[1] WU Mengxi;ZENG Hui;ZHANG Ying;XIANG Qianqian;DENG Ying;HUANG Wenyao(Hubei Provincial Center for Disease Control and Prevention,Hubei Provincial Key Laboratory for Applied Toxicology,Wuhan 430079,China)

机构地区：[1]湖北省疾病预防控制中心应用毒理湖北省重点实验室,武汉430079

出　　处：《化学分析计量》2020年第6期141-145,共5页Chemical Analysis And Meterage

摘　　要：根据JJF 1059.1-2012《测量不确定评定与表示》,建立离子色谱法测定环境空气PM2.5中硫酸根离子浓度的测量不确定度评定方法。依据HJ 194-2017《环境空气质量手工监测技术规范》进行采样、运输和保存,依据HJ 799-2016《环境空气颗粒物中水溶性阴离子(F-,Cl-,Br-,NO2-,NO3-,PO43-,SO32-,SO42-)的测定离子色谱法》进行环境空气PM2.5中硫酸根离子的测定,建立测量模型,确定不确定度来源,对各个不确定度分量进行评定,并计算合成标准不确定度。环境空气PM2.5中硫酸根离子的合成标准不确定度为0.058μg/m3,扩展不确定度为0.12μg/m3,硫酸根离子的测量结果为(2.26±0.12)μg/m3。标准曲线拟合过程中引入的相对标准不确定度和平行样重复性测定引入的相对标准不确定度较大,是提高该测定结果准确度的关键。According to JJF 1059.1-2012 Evaluation and Expression of Measurement Uncertainty,the evaluation method of measurement uncertainty for the determination of sulfate ion concentration in ambient air PM2.5 by ion chromatography was established.Sampling,transportation and storage were carried out according to HJ 194-2017 technical specification for manual monitoring of ambient air quality,and HJ 799-2016 determination of water-soluble anions(F-,Cl-,Br-,NO2-,NO3-,PO43-,SO32-,SO42-)in ambient air particles by ion chromatography was used to determine sulfate ion in ambient air PM2.5.The measurement model was established to determine the source of uncertainty,and the each component of uncertainty were evaluated,and the combined standard uncertainty was calculated.The standard uncertainty of sulfate ion synthesis in ambient air PM2.5 was 0.058μg/m3,the expanded uncertainty was 0.12μg/m3,and the measurement result of sulfate ion was(2.26±0.12)μg/m3.The relative standard uncertainty introduced in the calibration curve fitting process and the repeatability measurement of the parallel samples is relatively large,which is the key to improve the accuracy of the determination results.

关 键 词：离子色谱 PM2.5 不确定度 

分 类 号：O657.7[理学—分析化学]