Simultaneous determination of Diazinon, Malathion and Quinalphos pesticide formulations by gas chromatography with an electron capture detector

• Main Authors: Asha K.L., Tan G.H., Chai M.K.
• Other Authors: 16240801400
• Format: Article
• Published: 2023
• Subjects: Diazinon; GC-ECD; Malathion; Pesticide formulation; Quinalphos

A gas chromatography (GC) method has been developed to analyze simultaneously separate formulations of Diazinon, Malathion and Quinalphos with the internal standard method. A mixture of pure standard solution spiked with Chlorpyrifos as the internal standard and diluted with methanol was sonicated to homogenize the solutions. A 2?L volume of the mixture standard solution was injected into the GC-ECD and a six point calibration curve that demonstrated a linear range was established for each target compound. Samples of each formulation, mixed with the internal standard and diluted with methanol were injected into the GC-ECD. Combinations of three different concentrations of each formulated pesticide were analyzed six times to obtain coefficients of variation which are less than 1%. The total analysis time for each run was 15 minutes. The concentration of active ingredients in the pesticide formulations were calculated from the peak area values at a retention time interpolated from the calibration graphs. The analytical results which show 55.41 � 0.82% for Diazinon, 83.97 � 0.36% for Malathion and 10.89 � 0.89 % for Quinalphos were within the specifications for these commercial pesticide formulations.