Determination of monocrotophos pesticide by flow injection chemiluminescence method using luminol-hydrogen peroxide system

A simple flow injection chemiluminescence method is described for the determination of monocrotophos pesticide, based upon the direct reaction of monocrotophos with luminol and hydrogen peroxide in alkaline medium in the presence of an enhancer of sodium chloride. The CL intensity was linear related to monocrotophos concentration in the range of 2.0 x 10(-8)-1.0 x 10(-6) g/mL with a detection limit of 7 x 10(-9) g/mL. The relative standard deviation was less than 3% for 1.0 x 10(-7) g/mL monocrotophos in eleven repeated measurements. This method was successfully applied to the determination of monocrotophos in water samples. The possible reaction mechanism was also discussed briefly.