气相色谱法测定大气中甲醇、丙酮的不确定度评定  

Evaluation of Uncertainty of Methanol and Acetone Determination in Air by Gas Chromatography

作　　者：龙庆云[1] 李杰[1] 韦桂欢[1] 闫云[1] 

机构地区：[1]中国船舶重工集团公司第七一八研究所

出　　处：《舰船防化》2011年第4期26-31,共6页

摘　　要：通过对气相色谱法测定居住区大气中甲醇、丙酮的过程进行分析,建立了测定甲醇、丙酮方法的数学模型,讨论和比较了样品采集、标准溶液配制、解吸效率、解吸体积、进样体积和重复测定等因素对不确定度的影响,并计算了各影响因素的相对标准不确定度及该分析方法的合成不确定度和扩展不确定度。通过评定结果得知该方法的主要不确定度影响因素为样品采集、进样体积和重复测定,该方法测定甲醇和丙酮浓度分别为1.53mg/m3和1.50mg/m3,相对合成不确定度分别为4.0%和4.1%,相对扩展不确定度分别为8.0%（k=2）和8.2%（k=2）,则测量结果分别表示为（1.53±0.12）mg/m3（k=2）和（1.50±0.12）mg/m3（k=2）。The mathematical model of this method was established through the analysis of methanol and acetone in air of residential areas by Gas Chromatography. Various factors affecting uncertainty of measurement, such as sampling, standard solutions, efficiency of desorption, volume of desorption, volume of injection and measurement repeatability, were discussed and compared.The relative standard uncertainties of various factors, the combined uncertainty and the expanded uncertainty of the determination method were calculated.The main sources of measurement uncertainty were sampling, volume of injection and measurement repeatability. The concentration of Methanol and Acetone were 1.53mg/m3and 1.50mg/m3. The relative composed uncertainties were 4.0% and 4.1%. The relative expanded uncertainties were 8.0%（k=2）and 8.2%（k=2）, respectively. So the result of determination can be expressed as （1.53±0.12） mg/m3 （k=2） and （1.50±0.12） mg/m3 （k=2）.

关 键 词：甲醇 丙酮 居住区大气 不确定度 评定 气相色谱法 

分 类 号：O659.36[理学—分析化学]