Simultaneous determination of carbaryl and azinphos-methyl in water by first-derivative synchronous spectrofluorimetry |
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Authors: | J L Vilchez-Quero Jamal Rohand R Avidad-Castañeda A Navalón L F Capitán-Vallvey |
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Institution: | 1. Department of Analytical Chemistry, University of Granada, E-18071, Granada, Spain
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Abstract: | A method is proposed for the simultaneous determination of the pesticides carbaryl (CBL) and azinphos-methyl (AZM) in water by first-derivative synchronous spectrofluorimetry. It is based on the alkaline hydrolysis of both pesticides to their metabolites 1-naphthol (from CBL) and anthranilic acid (from AZM). The constant wavelength difference chosen to optimize the determination is Δλ=λem?λex=103 nm. CBL is measured at 302/405 nm and AZM at 333/436 nm. The calibration graphs are linear between 2.0 and 500.0 ng/ml for CBL and between 1.2 and 500.0 ng/ml for AZM with detection limits of 0.62 ng/ml and 0.35 ng/ml, respectively. The precision of the method (RSD) is 2.4% at the 80.0 ng/ml level for CBL and 2.5% at the 80.0 ng/ml level for AZM. The method is applied to the determination of both analytes in samples of natural waters. |
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