Simultaneous determination of the pesticides carbaryl and thiabendazole in environmental samples by a three-dimensional derivative variable-angle and a synchronous room-temperature phosphorescence spectroscopy.
A three-dimensional derivative variable-angle synchronous scanning (DVASS) and a synchronous scanning (SS) heavy-atom room-temperature phosphorimetry (HAI-RTP) method are reported, for the first time, to identify and quantify the spectral overlapping phosphorescent pesticides thiabendazole (TBZ) and carbaryl (CBL). These pesticides are widely used in agriculture. The phosphorescence emission of the two compounds was obtained using sodium sulfite as the O2 scavenger and an external heavy atom salt. A careful selection of these experimental variables has been carried out. The increase of selectivity afforded by the DVASS and the SS methodology permitted the demonstration of its applicability to the simultaneous determination of phosphorescent signals of these two pesticides with overlapping spectral profiles. Limits of detection ranged between 1.4 ng/mL for TBZ and 1.7 ng/mL for CBL. The proposed method has been satisfactorily applied to the analysis of both pesticides in different types of water samples.
Cañabate Díaz
B
B
Department of Analytical Chemistry, Faculty of Sciences, University of Granada, 18071 Granada, Spain.
Segura Carretero
A
A
Cruces Blanco
C
C
Fernández Gutiérrez
A
A
D012721:Carbaryl / Q000032:analysis*; D008163:Luminescent Measurements; D010575:Pesticides / Q000032:analysis*; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000379:methods*; D013696:Temperature; D013827:Thiabendazole / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000032:analysis
D010575:Pesticides; D014873:Water Pollutants; D013827:Thiabendazole; D012721:Carbaryl