DETERMINATION OF ACIDIC CHLORINATED PESTICIDES IN WATER - COMPARISON OF OFFICIAL EPA METHOD 515.1 AND LIQUID-SOLID EXTRACTION HPLC/UV AND HPLC/PBMS ANALYSES

摘要

A comparison of the official EPA method 515.1 for determination of chlorinated acidic pesticides and a modification of it is illustrated. Extraction of the analytes from water and their determination and quantitation is by gas chromatography-electron capture detection (GC-ECD), liquid chromatography-UV detection and liquid chromatography-particle beam mass spectrometry. Although HPLC-PBMS was found to be less sensitive than the GC-ECD method, it was, nevertheless, more sensitive than HPLC-UV. The modified method is simpler, quicker and allows more accurate determination of pesticides in aqueous samples. [References: 18]