[Resolution of synchronous fluorimetric spectrum for carbaryl and coumaphos and its application study]

The synchronous fluorimetric method for the simultaneous determination of carbaryl and coumaphos is described. In the Britton-Robinson buffer at pH 3.0, synchronous scanning with deltalambda= 60 nm was carried out, and the overlapped fluorimetric spectra were better separated. The two synchronous fluorimetric peaks are located at 280 and 322 nm respectively, and can be used for the determination of these two pesticides. No preliminary separation is needed. The method is simple, rapid and successfully applied to the analysis of food samples. The linear ranges of the calibration curves for carbaryl and coumaphos are 0.016-0.384 microg x mL(-1) and 0.016-0.320 microg x mL(-1), respectively. The limits of detection are 0.015 microg x mL(-1) for carbaryl, and 0.010 microg x mL(-1) for coumaphos.