【摘要】 建立了吹扫捕集-气相色谱法测定水样中乙醛和丙烯醛的方法,并对吹扫捕集测试条件进行优化,考察了吹扫温度和吹扫时间对吹扫捕集效率和方法检出限的影响。在50℃下,吹扫时间为20 min时,该方法乙醛和丙烯醛的检出限分别为0.001 2 mg/L、0.000 6 mg/L,相对标准偏差分别为3.5%～6.9%、2.9%～5.8%,加标回收率分别为91.6%～108%、92.0%～105%。与GB3838-2002推荐使用的分析方法相比较,该方法具有操作简便、灵敏度高、重复性好、基本上不消耗有机溶剂等特点,可满足地表水和废水中乙醛和丙烯醛的测定要求。更多还原

【Abstract】 This paper reports a new purge-trap GC analytic method established for determination of acetaldehyde and acrolein in water with condition of purge and trap being optimized.The effects of purge temperature and time on trap efficiency and detection limits were investigated.It was found that when the sample was purged at 50 ℃ for 20 min,detection limits of acetaldehyde and acrolein would be 0.001 2 mg/L and 0.000 6 mg/L respectively.Compared with the recommended analysis method of the relevant national standard of GB3838-2002,this method was characterized by ease of operation,high sensitivity and good repeatability,and on the other hand,almost no organic solvent was consumed during the operation.更多还原