海水中氟氯烃的吹扫捕集气相色谱分析

Determination of Chlorofluorocarbons in Seawater by Purge-trap Gas Chromatography

建立了吹扫捕集气相色谱法测定海水中氟氯烃的方法．结果表明．本方法测得的氟氯烃的精密度和回收率高。CFC-11、CFC-113、CCl4的相对标准偏差为1．9％～4．1％，回收率为99．3％～101．0％，检测限分别为0．0145pmol／kg、0．0332pmol／kg、0．0198pmol／kg．本方法操作简便快速，是一种海水氟氯烃测定的可靠分析方法，已成功应用于北冰洋海域海水样品的分析测定．

An analytical technique has been established for rapid and accurate measurement of three anthropogenically produced chlorofluorocarbons（CFCs）, CCl3F（CFC-11）, CCl2FCClF2 （CFC-113） and CCl4 in seawater. Seawater samples are transferred into glass ampoules for storage until analysis. CFCs in seawater are determined by purge-trap gas chromatography with a capillary column and electron capture detector （ECD）. The experimental result shows that the precision and recovery of the analytical method are good, with the relative standard deviation of 1.9 % ～ 4. 1% and the recovery of 99.3 % ～101.0 %, and the detection limits are 0.014 5 pmol/kg,0. 033 2 pmol/kg and 0. 019 8 pmol/kg for CFC-11 ,CFC-113 and CC14 respectively. The procedure is simple and fast,it has been proved to be a reliable method for the determination of CFCs in seawater and has been successfully used in CFCs determination of seawater samples in the Arctic Ocean.