Abstract
A fluorometric method for the determination of 1-naphthol (NP) with 3-amino-2(1H)-quinolinethione (AQT) was developed. The method is based on the oxidation of NP by Fremy's salt and the reaction with AQT in an acid medium, followed by extraction of a red fluorescent product (excitation maxima, 535 and 575 nm; emission maximum, 600 nm) with carbon tetrachloride after making the reaction mixture strongly basic. The calibration curve was linear in the range from 0.01 to 1.2 μg/ml of NP. This method was applied for the fluorometric determination of Carbaryl (NAC, 1-naphthyl N-methylcarbamate)(0.01-1.8 μg/ml), which was hydrolyzed with potassium hydroxide and determined by the same method as NP. The coefficient of variation was 13% (n=10) or 1.5% (n=10) for 0.3 μg/ml of NP or NAC, respectively.
