吹扫捕集-气相色谱-质谱法测定地表水中氯苯
李旭霞
山东科泰环境监测有限公司,山东临沂 276007
Determination of chlorobenzene in surface water by purge and trap gas chromatography mass spectrometry
李旭霞
Shandong Elcoteq Environmental Monitoring Co., Ltd., Linyi 276007, China
摘要:采用吹扫捕集法富集地表水样中的氯苯,用气相色谱-质谱法进行测定。吹扫捕集流量为40 mL/min,吹扫时间为12 min,氯化钠加入量为2.5 g/(5 mL),以DB-624色谱柱进行分离。氯苯的质量浓度在0~40.0 μg/L范围内与色谱峰面积呈良好的线性关系,相关系数r0.9994,检出限为0.07 μg/L。加标回收率为93.4%~98.1%,测定结果的相对标准偏差小于3%(n=7)。该方法检出限低,精密度和准确度满足分析测试要求,适用于地表水中痕量氯苯的测定。
Abstract:The chlorobenzene in surface water was determined by gas chromatography-mass spectrometry after being enriched by purge and trap method. The purging and collecting flow rate was 40 mL/min, purging time was 12 min and the the amount of adding sodium chloride was 2.5 g/(5 mL). The sample was separated by DB-624 column. The concentration of chlorobenzene was linear with the peak area in the range of 0-40.0 μg/L, the linear correlation coefficient was 0.9994, and the detection limit was 0.07 μg/L. The recoveries of the spikes were 93.4%-98.1%, and the relative standard deviations of determination results were less than 3%(n=7). The detection limit of the method was low and its precision and accuracy can meet the test requirements, so it is suitable for the detection of benzene in surface water.
关键词:吹扫捕集;气相色谱-质谱法;地表水;氯苯
Keywords:purge and trap; gas chromatography-mass spectrometry; surface water; chlorobenzene
本文引用格式:
李旭霞.吹扫捕集-气相色谱-质谱法测定地表水中氯苯[J]. 化学分析计量,2018,27(1):35-38.
LI X X. Determination of chlorobenzene in surface water by purge and trap gas chromatography mass spectrometry[J]. Chemical analysis and meterage,2018,27(1):35-38.
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