データベースを利用したGC/MSによる検出および定量法の河川水中農薬分析への適用性に関する検討

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A GC/MS method was examined for applicability for the determination of pesticides in river water. This method can determine samples through the use of a database of information regarding compounds for identification and quantification. Retention time and MS response were made consistent but specific for each compound using retention time locking for the former and the combination of DFTPP tuning and internal standard method for the latter, thereby compiling over 150 pesticides. In addition, the MS response ratio of target ion and qualifier ion (TQ ratio) and the MS spectrum also acquired under DFTPP tuning were compiled. Simulation samples were prepared by extracting river water with dichloromethane and then concentrating by thousand. The concentrates were then fortified to 1 μg/mL with 70 pesticides in the database. The samples were determined with a GC/MS system which was different from the one used for the acquisition of the complied data. The relative differences of obtained retention times between those in the database were 0.2-0.3%. Quantification values, even though most of them shifted higher than the expected by the influence of matrix effect, were within the range from half to twice of the fortified value (0.6-1.8 μg/mL). Those were coincident enough considering that the data was acquired without standard substance compensation. And for most of the data, a MS library search resulted in high match quality and TQ ratios also showed good coincidence. Those results prove that the database method is very useful for the determination of pesticides in river water.

データベースを利用したGC/MSによる検出および定量法の河川水中農薬分析への適用性に関する検討

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