顶空进样-气相色谱法测定环境水质中甲醇和丙酮  

Determination of methanol and acetone in environment water by headspace injection-gas chromatography

作　　者：刘文捷 林庆文[1] 李胜生[1] 陈园园[1] LIU Wenjie;LIN Qingwen;LI Shengsheng;CHEN Yuanyuan(Anhui Institution of Geological Experiment,Hefei 230001,China)

机构地区：[1]安徽省地质实验研究所,合肥230001

出　　处：《化学分析计量》2022年第10期26-29,共4页Chemical Analysis And Meterage

摘　　要：建立顶空进样-气相色谱法测定环境水体中甲醇和丙酮的方法。通过实验优化了顶空及色谱条件,顶空进样条件:在80℃下加热30 min,取样针温度为100℃,传输线温度为110℃;色谱条件:采用聚乙二醇毛细管柱,进样分流比为5∶1,进样口温度为220℃;检测器温度为280℃。甲醇、丙酮的质量浓度分别在0.0~45.0、0.0~4.5 mg/L范围内与色谱峰面积线性关系良好,相关系数均大于0.999。当取样量为10 mL时,甲醇、丙酮的方法检出限分别为0.18、0.017 mg/L。样品加标回收率分别为87.3%~100.9%、84.6%~108%,测定结果的相对标准偏差分别为0.93%~3.95%、1.01%~4.32%(n=6)。该方法无需复杂的样品处理步骤,安全、环保、快捷。A method for the determination of methanol and acetone in environmental water by headspace injection-gas chromatography was established.The headspace and chromatographic conditions were optimized.The headspace injection conditions were as follows:temperature at 80℃ for 30 min,the sampling needle temperature was 100℃,and transmission line temperature was 110℃.Chromatographic conditions:polyethylene glycol capillary column was selected,and the injection split ratio was 5∶1,the inlet temperature was 220℃,and the detector temperature was 280℃.The mass concentration of methanol and acetone had a good linear relationship with the chromatographic peak area in the range of 0.0-45.0 and 0.0-4.5 mg/L,respectively,and the correlation coefficients were all more than 0.999.When the sampling volume of water sample was 10 mL,the detection limit of the method was 0.18 mg/L for methanol and 0.017 mg/L for acetone.The recovery was 87.3%-100.9% for methanol,and 84.6%-108% for acetone,the relative standard deviation was 0.93%-3.95%for methanol and 1.01%-4.32% for acetone(n=6).The method does not need complex sample pretreatment,which is environment-friendly and fast.

关 键 词：顶空-气相色谱法 甲醇 丙酮 环境水体 

分 类 号：O657.7[理学—分析化学]