Determination of organic phosphorus pesticide in environmental water by flow injection-spectrophotometry

An automatic, convenient method combined flow injection technique for determining organic phosphorus pesticide in environment water was developed based on the inhibition effects of organic phosphorus pesticide to plant-esterase. The optimized determining conditions were acquired, and the analytical characteristics of this method were studied. The linear ranges of dichlorvos´ standard curves was 0.008 ~ 4mg/L. The linear equation of dichlorvos was U(mV) = -4874.4 C (mg/L) + 110313. The correlation coefficient of dichlorvos was 0.9984. The detection limit (S/N= 3) was 0.02 mg/L for dichlorvos. The relative standard deviation (RSD) of dichlorvos was 1.04% (n=6). The recoveries ranged from 95% to 105%. The analysis result was good.