Determination of organophosphorous pesticide phosphamidon in environmental water with luminol chemiluminescence detection.

A novel chemiluminescence method has been developed for the determination of the organophosphorous pesticide phosphamidon in environmental water samples, based on the reaction of phosphamidon with luminol-H2O2 in an alkaline medium using sodium dodecyl benzene sulfonate as the enhancer. Under optimum conditions, the increased chemiluminescence intensity was proportional to the concentration of phosphamidon in the range of 0.01-1.0 microg/mL and the detection limit was 0.0038 microg/mL (3 sigma). The relative standard deviation was <2% for 0.5 microg/mL phosphamidon (n = 11). The proposed method was applied to the determination of phosphamidon residue in an environmental water sample with satisfactory results. Further study was focused on the mechanism of phosphamidon, and a possible mechanism was proposed.