P&T-GC/MSD测定地表水比对样品中苯系物不确定度的评定

刘海萍; 鲁炳闻; 杨刚; 房丽萍

doi:10.3969/j.issn.1674-991X.2017.05.083

P&T-GC/MSD测定地表水比对样品中苯系物不确定度的评定

doi: 10.3969/j.issn.1674-991X.2017.05.083

环境保护部标准样品研究所,国家环境保护污染物计量和标准样品研究重点实验室(筹),北京 100029

详细信息

作者简介:
刘海萍(1981—),女,高级工程师,主要从事标准样品的研究及监测分析,liu.haiping@ierm.com.cn

中图分类号: X832
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出版历程
- 收稿日期: 2017-04-21
- 刊出日期: 2017-09-20

Evaluation of uncertainty of benzene series in surface water by P&T-GC/MSD in interlaboratory comparison

State Environmental Protection Key Laboratory of Measurement and Reference Material, Institute for Environmental Reference Materials of Ministry of Environmental Protection, Beijing 100029, China

摘要

摘要: 为了提高对地表水中苯系物的检测能力,参加了某国际机构组织的地表水中苯系物检测比对活动。能力验证的样品采用吹扫、捕集和解析等前处理后,通过气相色谱-质谱法检测地表水中苯、甲苯、间/对二甲苯和邻二甲苯的浓度;并通过建立数学模型来分析和计算测试过程中的不确定度分量,以对其不确定度进行评定。结果表明:苯、甲苯、间/对二甲苯、邻二甲苯的检测结果满意率均为100%;从标准溶液、内标溶液、多功能自动进样器取样、样品测量的重复性和回收率等方面引入的不确定度进行评定,并将不确定度进行合成,得到苯、甲苯、间/对二甲苯和邻二甲苯的扩展不确定度(k=2)依次为0.077、0.095、0.250和0.140。
- 苯系物 /
- 地表水 /
- 比对 /
- 不确定度
Abstract: In order to develop detection skill on benzene series, proficiency testing of benzene series in surface water organized by an international agency was attended. The samples were pretreated by purge and trap, and the benzene, toluene, p-xylene and m-xylene, o-xylene concentrations in the surface water determined by Gas Chromatography and Mass Spectrometry. The components of uncertainty were analyzed and calculated by establishing a mathematical model, and the uncertainty in the process of test was assessed. The result was finally submitted to the organizer. The statistics showed that the satisfactory rate of all the benzene series was 100%. Firstly the uncertainty of benzene series in surface water was evaluated from aspects of reference solution, internal solution, multifunctional automatic sampler, repeatability of measurement and recovery ratio, respectively. Then each component of uncertainty was combined, and the expanded uncertainty of benzene, toluene, p-xylene and m-xylene, o-xylene was obtained, being 0.077, 0.095, 0.250 and 0.140, respectively, when k was equal to 2.
- benzene series /
- surface water /
- interlaboratory comparison /
- uncertainty

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参考文献(16)

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