Gas chromatographic determination of CCRL583 perfluorinated alcohol fumigant residues.

A gas chromatographic method is described for the determination of CCRL583 (1,1,1,3,3,4,4,4-octafluoro-2-(trifluoromethyl)-2-butanol). The sample is extracted with acetonitrile and cleaned up by liquid-liquid extraction, first with a basic aqueous solution and finally with an acid aqueous solution. The final organic layer is injected into a gas chromatograph equipped with a column packed with terephthalic acid-terminated Carbowax 20M. Recovery of CCRL583 from fortified wheat and peanuts was 91-108%.

Rapid cleanup procedure for gas-liquid chromatographic determination of chlorpyrifos-methyl residues in cat food.

A simple and rapid gas-liquid chromatographic (GLC) method was developed for the determination of residues of chlorpyrifos-methyl in dry cat food. Cat food fortified with chlorpyrifos-methyl was extracted with acetone and cleaned up on a modified acetonitrile-on-Florisil partitioning column. The chlorpyrifos-methyl was determined by GLC with a flame photometric detector. Results were compared with those for known standards that had undergone the same cleanup procedure. The quantitative electronic integration limit of determination was 0.03 pp. Average recoveries for 5 analyses at fortification levels from 0.052 to 51 ppm ranged from 90 to 102% and averaged 97%.

Determination of pirimiphos methyl in formulations by high performance liquid chromatography.

A simple and rapid method for the determination of pirimiphos methyl (O-[2-(diethylamino)-6-methyl-4-pyrimidinyl] O,O-dimethyl phosphorothioate) in formulations by high performance liquid chromatography is described. The sample is dissolved in methanol, and biphenyl is added as an internal standard. Then the sample is chromatographed by reverse phase chromatography on a Zipax octadecylsilane column. A 4 mul injection containing 0.01% pirimiphos methyl produces a 50% full scale peak at the maximum absorbance at 254 nm.

Gas-liquid chromatographic determination of m-phenoxybenzyl cis, trans-(+/-)-3-(2,2-dichlorovinyl)-2-2-dimethylcyclopropanecarboxylate in aqueous formulations.

A simple and rapid gas-liquid chromatographic (GLC) method was developed for the analysis of aqueous solutions of FMC 33297 (mphenoxybenzyl cis,trans-(+/-)-3-(2,2-dichlorovinyl) - 2,2 - dimethylcyclopropanecarboxylate). The compound is extracted from aqueous solution with benzene and cleaned up by liquid chromatography. The sample extracts are analyzed by GLC with a flame ionization detector and quantitated by comparing integrator counts of extracts with those of standards. Recoveries of FMC 33297 were 90-100%. The method has good precision (the standard deviation for 4 determinations of a 0.002394% formulation was 6 X 10(-6)) and is sensitive to 0.00004% active ingredient by weight,

Gas chromatographic determination of hydrazoic acid.

A gas chromatographic procedure was developed for the determination of hydrazoic acid. Two possible columns were evaluated. The limits of detectability were 1.5 ng, or approximately 0.05%, in aqueous solution (w/v) and 2 mg per liter in air.

The determination of BHT in resmethrin by high-pressure liquid chromatography.

A method was developed to determine the amount of butylated hydroxy toluene in resmethrin and resmethrin formulations by high-pressure liquid chromatography.