Determination of thiabendazole residues in waters by solid-phase spectrofluorometry.
A new, sensitive and simple spectrofluorometric method for the determination of thiabendazole (TBZ) residues was studied. TBZ on Sephadex G-15 gel, pH 4.70 acetate buffer, is fixed to give fluorescence. The fluorescence of the gel-TBZ system, packed in a 1-mm quartz cell was measured directly using a solid-surface attachment. The applicable concentration range was 1.5-10.0 ng.mL-1 with a relative standard deviation of 1.4% and a detection limit of 0.1 ng.mL-1. The method was applied to the determination of thiabendazole in natural, waste, sea, and residual waters (98-100% recovery). The method is more sensitive and selective than other methods described in the literature. The presence of other fluorescent pesticides (dichlone, carbaryl, morestan, o-phenylphenol) with similar spectral features (lambda exc and lambda em neighboring to excitation and emission wavelengths of the TBZ) did not cause interference.
Capitán
F
F
Department of Analytical Chemistry, University of Granada, Spain.
Alonso
E
E
Avidad
R
R
Capitán-Vallvey
L F
LF
Vilchez
J L
JL
D006863:Hydrogen-Ion Concentration; D010573:Pesticide Residues / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence; D013827:Thiabendazole / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D010573:Pesticide Residues; D014874:Water Pollutants, Chemical; D013827:Thiabendazole