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顶空-气相色谱法测定水中苯系物的不确定度研究
引用本文:郭倩,秦迪岚,罗岳平,毕军平,宋冰冰,朱颖,刘荔彬,殷文杰.顶空-气相色谱法测定水中苯系物的不确定度研究[J].环境科学与管理,2014,39(12):133-138.
作者姓名:郭倩  秦迪岚  罗岳平  毕军平  宋冰冰  朱颖  刘荔彬  殷文杰
作者单位:湖南省环境监测中心站国家环境保护重金属污染监测重点实验室,湖南长沙,410019
基金项目:湖南省环境保护科技项目
摘    要:建立顶空-气相色谱法测定水中苯系物不确定度的评定方法,分析测定过程中的主要影响因素,评定测定过程中引入不确定度的来源.通过分析和量化影响测定结果的不确定度分量,得出各分量对不确定度的相对贡献,对测定结果进行了表述.结果表明,顶空-气相色谱法测定水中苯系物七种组分的相对合成不确定度范围为6.09% ∽ 11.11%,苯乙烯和邻二甲苯的不确定度较大,不确定度的主要影响因素为标准溶液及曲线配制、方法加标回收和样品重复测量.

关 键 词:顶空  气相色谱  苯系物  不确定度评定

Evaluation of Uncertainty in Determining BTEXs in Water by Headspace Gas Chromatography
Guo Qian,Qin Dilan,Luo Yueping,Bi Junping,Song Bingbing,Zhu Ying,Liu Libin,Yin Wenjie.Evaluation of Uncertainty in Determining BTEXs in Water by Headspace Gas Chromatography[J].Environmental Science and Management,2014,39(12):133-138.
Authors:Guo Qian  Qin Dilan  Luo Yueping  Bi Junping  Song Bingbing  Zhu Ying  Liu Libin  Yin Wenjie
Institution:(Hunan Province Environmental Monitoring Centre, State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants, Changsha 410019, China)
Abstract:This paper established a method for evaluating uncertainty of BTEXs measurement in water by Headspace - Gas Chromatography. The sources of uncertainty and main influential factors of uncertainty in the measurement process were also ana- lyzed. According to the analysis and quantification on factors impacting the uncertainty, the standard uncertainty and the expand- ed uncertainty were calculated. The result showed that the relative combined uncertainty range was 6. 09% - 11.11% in the measurement of the seven BTEXs components in water by Headspace - Gas Chromatography. The uncertainty of styrene and o - xylene was higher than that of the others. The main influential factors of uncertainty were the calibration of standard curve, the re- coveries of sample and samples repeatability.
Keywords:headspace  gas chromatography  BTEX  uncertainty evaluation
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