吹扫捕集-气相色谱法测定水中乙醛、丙烯醛、丙烯腈

摘要

Purge and trap technique was applied in the GC determination of acetaldehyde, acrolein and acrylonitrile in water. The analytes were purged, trapped and thermodesorbed using the Trap Vocarb 3000, and determined by CR2 with flame ionization detector （FID）. Linear relationships between values of peak area and mass concentration of acetaldehyde, acrolein and acrylonitrile obtained were same in the range of 0. 020--0.20 mg·L^-1 , with detection limits （3S/N） of 0. 005, 0. 010, 0. 001mg·L^-1 respectively. Tests for recovery and precision were made by standard addition method, values of recovery found were in the range of 90. 0%-110.0% and values of RSD＇s （n=7） were less than 50%.%提出了吹扫捕集－气相色谱法测定水中乙醛、丙烯醛和丙烯腈的分析方法。样品用Trap Vocarb 3000捕集阱吹扫、捕集及热解析后，用气相色谱法氢火焰离子化检测器分析。3种化合物的质量浓度在0．020～0．20mg·L^-1的相同范围内与其峰面积呈线性关系，方法的检出限（3S／N）分别为0．005，0．010，0．001mg·L^-。标准加入回收率在90．0％～110．0％之间，相对标准偏差（n=7）均小于5％。