实际水样测定挥发性有机物实验中替代物回收率影响因素探讨

Discussion on the factor of the recovery rate of substitute in the experiment of volatile organic compounds determination with actual samples

探讨了全自动吹扫捕集-气质联用法测定水中挥发性有机物实验中影响替代物回收率的因素。由实验结果可知,采集模式、样品前处理、加入浓度、使用液的配制方式均会影响实际水体替代物的回收率。为了快速、准确地分析水中挥发性有机物,可采用选择离子扫描模式、样品不过滤、适当提高加入浓度、使用液单独配制等方式,更好地满足质量控制要求。

The effects of substitution recovery rate of purge-and-trap chromatography and mass spectrometry for determina⁃tion of volatile organic compounds in water were discussed.The results show that,the acquisition mode,sample pretreat⁃ment,the concentration,the preparation of working solution will all affect the recovery rate of substitute.In order to analyze VOCs in water quickly and accurately,we can choose selective ion mode,do not filter the sample,properly increase the con⁃centration of substitute,and make up working solution separately for meeting the quality control requirements preferably.