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Abstract
A novel chemiluminescence method for the quantitative assay of the organophosphorus pesticide chlorpyrifos in vegetable samples is presented. The determination is based on the reaction of chlorpyrifos with luminol-H2O2 in alkaline medium with sodium chloride being enhancer. Under the optimum conditions, the increased CL intensity was proportional with the concentration of chlorpyrifos in the range of 1.0 × 10−8 g · ml−1 − 1.0 × 10−6 g · ml−1 and the detection limit was 3.5 × 10−9 g · ml−1 (3σ). The relative standard is less than 3.9% for 5.0 × 10−7g · ml−1 chlorpyrifos (n = 7). This method has been successfully applied to the determination of chlorpyrifos residue in vegetable sample. Further study was focused on the mechanism of chlorpyrifos and the possible mechanism was proposed.