Fluorometric determination of carbaryl in micellar Media.
A new method is proposed for the fluorometric determination of carbaryl, based on the basic hydrolysis of the pesticide to 1-naphtholate at pH 12 and enhancement of the relative quantum yield of this latter compound by the presence of non-ionic surfactants. The procedure is quick and easy and presents a limit of detection of 1.4 ng/ml. The interaction of carbaryl with non-ionic surfactants has been studied both spectrophotometrically and fluorometrically, in different media. To determine carbaryl in real samples prior extraction into xylene and back-extraction with 1 M sodium hydroxide is necessary to avoid the strong quenching effect of the matrix.
Sancenón
J
J
Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, Dr Moliner 50, 46100 Burjasot Valencia, Spain.
Carrión
J L
JL
de la Guardia
M
M