Gas-Liquid Chromatographic Determination of Trichlorfon (Dipterex) in Livestock Products using a Flame Photometric Detector

Abstract A gas-liquid chromatographic (GLC) headspace technique is described for determining sodium bisulfite in a dermatological cream. The sample is dispersed in an aqueous medium and acidified to convert sulfite to volatile sulfur dioxide which partitions into the headspace. An aliquot of the headspace vapor is analyzed by GLC using the sulfur-selective flame photometric detector. Advantages of the method include the facility of sample preparation, the specificity and sensitivity resulting from the combined use of the headspace technique and the flame photometric detector, and the applicability of the method to various types of sample matrices. Recoveries ranged from 95 to 102% for spiked samples containing 200—2000 ppm sodium bisulfite. For the sample size and experimental conditions used in this application, the detection limit is 0.02 mg sodium bisulfite.

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Rapid Cleanup Procedure for Gas-Liquid Chromatographic Determination of Chlorpyrifos-Methyl Residues in Cat Food

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/64.5.1227 ◽

1981 ◽

Vol 64 (5) ◽

pp. 1227-1231

Author(s):

Richard A Simonaitis ◽

R Spencer Cail ◽

James M Zehner

Keyword(s):

Chromatographic Determination ◽

Flame Photometric Detector ◽

Integration Limit ◽

Photometric Detector ◽

Limit Of Determination ◽

Cleanup Procedure ◽

Liquid Chromatographic Determination ◽

Electronic Integration ◽

Liquid Chromatographic

Abstract 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 ppm. Average recoveries for 5 analyses at fortification levels from 0.052 to 51 ppm ranged from 90 to 102% and averaged 97%.

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Gas-Liquid Chromatographic Determination of Famphur and Its Oxygen Analog in Tissues of Reindeer and Cattle

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/59.2.261 ◽

1976 ◽

Vol 59 (2) ◽

pp. 261-263

Author(s):

Marcellus C Ivey

Keyword(s):

Chromatographic Determination ◽

The Body ◽

Gas Chromatograph ◽

Flame Photometric Detector ◽

Oxygen Analog ◽

Body Tissues ◽

Liver And Kidney ◽

Liquid Chromatographic Determination ◽

Liquid Chromatographic

Abstract A gas chromatograph equipped with a flame photometric detector operating in the phosphorus mode provided a sensitive method for determining residues of famphur, O,O-dimethyl O-[p-(dimethylsulfamoyl)phenyl]phosphorothioate, and its oxygen analog in reindeer and cattle tissues. With extraction and cleanup, 0.025 ppm famphur and 0.06 ppm oxygen analog could be detected in the body tissues. Recoveries of 73–100% were obtained from fat, muscle, liver, and kidney.

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Gas-Liquid Chromatographic Determination of Fenitrothion in Fish, Water, and Sediment

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/57.6.1282 ◽

1974 ◽

Vol 57 (6) ◽

pp. 1282-1284

Author(s):

Norbert Grift ◽

W Lyle Lockhart

Keyword(s):

Fish Tissue ◽

Chromatographic Determination ◽

Fish Muscle ◽

Gas Liquid Chromatography ◽

Tissue Water ◽

Flame Photometric Detector ◽

Water And Sediment ◽

Liquid Chromatographic Determination ◽

Liquid Chromatographic

Abstract A procedure is described for the determination of fenitrothion (O,O-dimethyl O-4-nitro-3- methylphenyl thiophosphate) residues in fish tissue, water, and sediment. Fish and sediment samples are extracted with ethyl acetate and cleaned up by partitioning with hexane and passing through Florisil columns. Extracts are analyzed by gas-liquid chromatography, using a flame photometric detector to determine phosphorus and sulfur. Mean recoveries of triplicate analyses of fish muscle samples spiked with 0.1-5.0 μg fenitrothion/g were 94舓110%.

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Gas-Liquid Chromatographic Determination of Chlorphoxim Residues in Water and Fish by In-Block Methylation

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/59.5.1088 ◽

1976 ◽

Vol 59 (5) ◽

pp. 1088-1093

Author(s):

William E Dale ◽

James W Miles ◽

Frederick C Churchill

Keyword(s):

Water Samples ◽

Chromatographic Method ◽

Methylene Chloride ◽

Chromatographic Determination ◽

Flame Photometric Detector ◽

Liquid Chromatographic Method ◽

Fish Samples ◽

Liquid Chromatographic Determination ◽

Liquid Chromatographic

Abstract A gas-liquid chromatographic method has been developed for the analysis of residues of chlorphoxim, 2-chloro-α-(((diethoxyphosphinothioyl)oxy)imino)-benzeneacetonitrile, in water and fish. The method is based on the in-block methylation of chlorphoxim with 0.01M trimethylanilinium hydroxide in methanol. The derivative, O,O-diethyl O-methyl phosphorothioate, was determined quantitatively by using a flame photometric detector specific for phosphorus. The in-block reaction is 70% efficient. Water samples were extracted with hexane; fish were extracted with methylene chloride and cleaned up on an acetonitrile-hexane partition column. Recoveries from water and fish samples spiked with chlorphoxim averaged 86.3 and 80.4%, respectively. Limits of detection were 10.0 ppb for 5 g samples of fish and 0.10 ppb for 300 ml water samples.

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