Abstract
In this study, the pesticide chlorfenson was determined and quantified in drinking water samples using gas chromatography-mass spectrometry (GC-MS). An optimized temperature program enabled the elution of chlorfenson with a sharp, transient peak and a short total run time of 7.0 minutes. Identification and quantification of chlorfenson were based on ion peaks with high relative abundance selected from the National Institute of Standards and Technology (NIST) library, with confirmation of the specific chromatographic peak. The method showed linearity across a broad concentration range (0.52– 49.53 mg/kg), with a limit of detection (LOD) of 0.17 mg/kg and a limit of quantification (LOQ) of 0.56 mg/kg. Method validity was confirmed through recovery experiments on real drinking water samples. Although chlorfenson was not detected in the tested drinking water samples, spiked samples showed recovery rates ranging from 87.6% to 123.3%. These results demonstrate that the proposed method provides accurate and reliable determination of chlorfenson in complex matrices such as drinking water.