Abstract.
In this paper, Malathion as representative for organophosphorus pesticide was analysed by gas chromatography equipped with flame photometric detector (GC-FPD) (P-mode). The analysis was performed on HB-5, 30 m x 0.32 mm capillary column with a 0.25 μm stationary film thickness using ultra pure nitrogen (99.9999%) as a carrier gas at 25 psi constant pressure. The method successfully meets or even exceeds the minimum standards recommended in the American Society for Testing and Materials (ASTM) guidance. Sensitivity, minimum delectability, dynamic range, linear range and noise were measured. The linear ranges was (8.8x– 3.9x) gP/s and limit of detection was (5.769 x 10-11) gP/s, while the dynamic range was (1-10500) ppm. The relative standard deviation (RSD %) was 2.6% (n = 5). The method is precise, reproducible and linear over a wide range of concentration. It can be recommended as a suitable method for the quantification of Malathion in cases of acute poisoning.