Thin-layer chromatographic detection of carbaryl using phenylhydrazine hydrochloride

Amperometric and spectrophotometric determination of carbaryl in natural waters and commercial formulations

“…The 1-naphthol-phenylhydrazine reaction occurs at strongly alkaline pH [8]. To select the appropriate pH for formation of the coloured complex, phenylhydrazine solutions of concentrations between 0.25 and 1.0% were prepared in sodium hydroxide solutions of 0.5 to 2.5 mol L -1 concen-tration (Fig.…”

“…UV [3], diode-array [4,5], florescence [5,6], or electrochemical [7], although some of these methods also require pre-treatment steps to form detectable derivatives. Thin-layer chromatography has occasionally been employed [8].…”

Pesticides

“…Several detection reagents for carbaryl were referred to: formation of the oxime, treatment with j8-naphthol, and oxidation with nitric acid (145); diazotized /?-nitroaniline Copyright © 2003 by Taylor & Francis Group LLC and diazotized p-aminoacetophenonone (146); /7-nitrobenzenediazonium fluoborate (147); alkaline phenylhydrazine hydrochloride, with a detection limit of about 100 ng/spot (148); specific reagent ammonium cerium(IV) nitrate in 20% HC1, which reacts with 1-naphthol hydrolysis product of carbaryl and forms a violet complex (149); diazotized 6-amino-l-naphthol-3-sulfonic acid and then NaOH solution (150). Several detection reagents for carbaryl were referred to: formation of the oxime, treatment with j8-naphthol, and oxidation with nitric acid (145); diazotized /?-nitroaniline Copyright © 2003 by Taylor & Francis Group LLC and diazotized p-aminoacetophenonone (146); /7-nitrobenzenediazonium fluoborate (147); alkaline phenylhydrazine hydrochloride, with a detection limit of about 100 ng/spot (148); specific reagent ammonium cerium(IV) nitrate in 20% HC1, which reacts with 1-naphthol hydrolysis product of carbaryl and forms a violet complex (149); diazotized 6-amino-l-naphthol-3-sulfonic acid and then NaOH solution (150).…”

“…Some methods of carbaryl, carbofuran, and propoxur detection were reviewed in Section IV (145)(146)(147)(148)(149)156 thionate and phosphorothiolothionate pesticide detection was also mentioned (151). Some methods of carbaryl, carbofuran, and propoxur detection were reviewed in Section IV (145)(146)(147)(148)(149)156 thionate and phosphorothiolothionate pesticide detection was also mentioned (151).…”

Determination of pesticides in honey using excitation–emission matrix fluorescence coupled with second-order calibration and second-order standard addition methods

“…Because of possible health effects and widespread use, simultaneous determination of carbendazim, carbaryl and its degradation product 1-naphthol are useful and essential. Most of analytical methods employed for quantification of pesticides are numerous and are based on a separation by chromatographic technique such as thin-layer chromatography (TLC) [1][2][3][4], gas chromatography (GC) [5][6][7][8] and high-performance liquid chromatography (HPLC) [9][10][11][12] with detectors of ultraviolet (UV), diode array detector (DAD) and mass spectrometry (MS). These methods mentioned above have many advantages such as high sensitivity and accuracy and some have been adopted by regulatory agencies.…”