Direct gas chromatographic determination of carbaryl

Direct determination of carbaryl by gas-liquid chromatography using electron capture detection

“…Thermal decomposition of carbaryl during chromatography has been observed elsewhere (Fishbein and Zielinski, 1965;Krishna et al, 1962). In order to avoid errors resulting from decomposition, a very short column with a low liquid phase load was used as suggested by Riva and Carisano (1969) and no decomposition was detected except at column temperatures exceeding 160°.…”

“…44,471 Direct Determination of Carbaryl by Gas Liquid Chromatography Using Electron Capture Detection A reproducible direct method for simultaneous electron capture detection, which improves sensidetermination of small quantities (0,2-15 ng) of tivity over other direct methods of carbaryl decarbaryl and its hydrolysis product, a-naphthol, termination, has not been previously described, is described. Gas-liquid chromatography using Carbaryl (l-naphthyl-Ahmethylcarbamate) is presently determined by a variety of gas-liquid chromatographic methods using Coulson conductivity and flame ionization (Coulson, 1966;Riva and Carisano, 1969; Zielinski and Fishbein, 1965). Another technique, involving conversion of the pesticide to various derivatives and subsequent gasliquid chromatographic analysis, though more sensitive, is indirect and time consuming.…”

Carbaryl: A Literature Review

“…The column was equilibrated with 50 to 100 ng amounts immediately prior to analysis and with ug quantities during column conditioning (LEWIS and PARIS 1974). Silanized column supports, with nonpolar liquid phases, have been used, e.g., LASKI andWATIS (1973) used 10% DC-200, andRIVA andCARISANO (1969) chromatographed carbaryl on a 0.5% SE-30 column with an alkali flame detector. Specially prepared carbowax 20M columns on acid-washed Chromosorb W support have been successful in chromatographing carbaryl.…”

Gas chromatographic separation of the aglycone metabolites of carbaryl

“…They are thermally unstable at temperatures usually needed for glc and decompose to an alcohol (1-naphthol in the case of carbaryl) and A-methylisocyanate. However, Riva and Carisano (1969) have directly analyzed carbaryl by glc employing low temperatures, short columns, and a low concentration (0.5%) stationary phase. Also, pesticidal carbamates have been gas chromatographed as their trimethylsilyl derivatives (Fishbein and Zielinski, 1965).…”