Development of Simultaneous Analytical Method for Agricultural Chemicals in Raw Water for Drinking Water Supply by Gas Chromatography Mass Spectrometry, Liquid Chromatography Time-of-Flight Mass Spectrometry or Liquid Chromatography-Inductively Coupled Plasma Mass Spectrometry and Study on Degradabilities in Their Chlorination Process

Abstract

We have developed a simultaneous analytical method for pesticides by gas chromatography mass spectrometry (GC/MS) , liquid chromatography mass spectrometry (LC/MS) or liquid chromatography-inductively coupled plasma mass spectrometry (LC/ICP/MS) . We applied this method to 195 pesticides that are frequently used or are “Complementary Items” in drinking water in Japan, and found that 192 of them could be analyzed. The recovery rates of the compounds from the river water and groundwater samples were within the range of 70-130%, with relative standard deviations of less than 20%. Considering the degradation by chlorination, the target pesticides were classified into 10 categories on the basis of the reaction rate constant. The structures of transformation products generated by chlorination were predicted using the mass spectrum and accurate mass that were obtained by liquid chromatography time-of-flight mass spectrometry (LC/TOF-MS) .