Simultaneous Determination of Diazinon, Malathion and Quinalphos Pesticide Formulations by Gas Chromatography with an Electron Capture Detector
Lal, Asha Kumari, and Tan, Guan Huat, and Chai, Mee Kin, (2006) Simultaneous Determination of Diazinon, Malathion and Quinalphos Pesticide Formulations by Gas Chromatography with an Electron Capture Detector. Malaysian Journal of Science, 25 (2). pp. 131-138. ISSN 13943065
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Official URL: http://www.ejum.fsktm.um.edu.my/
University of Malaya. Faculty of Science. Dept. of Chemistry.
Universiti Tenaga Nasional. College of Engineering. Dept. of Science & Mathematics.
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 2µL 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 IS 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.
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