Gas Chromatographic Determination of Dioxathion and Chlorfenvinphos in Emulsifiable Formulations and Livestock Dips

1970 ◽  
Vol 53 (3) ◽  
pp. 566-568
Author(s):  
J E Paterson
Keyword(s):  
Quantitative Determination ◽  
Chromatographic Analysis ◽  
Chromatographic Method ◽  
Silicone Oil ◽  
Chromatographic Determination ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Coefficients Of Variation ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for the quantitative determination of dioxathion and chlorfenvinphos in emulsifiable concentrates and livestock dips. A convenient quantity of the emulsifiable formulation is dissolved in xylene and the aqueous dip is extracted with xylene for gas chromatographic analysis, using a mixed silicone oil stationary phase and a flame ionization detector. The coefficients of variation for the dioxathion and chlorfenvinphos determinations in the emulsifiable concentrate are 2.4 and 1.0%, respectively. Recoveries of the former from a fouled dip ranged from 97 to 103% and recoveries of the latter ranged from 92 to 97%.

Gas-Liquid Chromatographic Determination of Acephate and Ortho 9006 Residues in Crops

1974 ◽  
Vol 57 (1) ◽  
pp. 189-191
Author(s):  
James B Leary
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Ether Solution ◽  
Liquid Chromatographic Determination ◽  
Gas Chromatographic Method ◽  
Liquid Chromatographic

Abstract A gas chromatographic method is described for determining acephate (O,S-dimethyl acetylphosphoramidothioate) and a metabolite, Ortho 9006 (O,S-dimethyl phosphoramidothioate), in a variety of crops. After extraction of the sample with ethyl acetate, the solvent is evaporated, and an ether solution of the residue is passed through a silica gel column to remove interferences. Acephate and Ortho 9006 are eluted from the column with 10% methanol in ether and measured simultaneously by programmed temperature gas chromatography, using an alkali flame ionization detector.

Gas Chromatographic Determination of Isofenphos in Technical and Formulated Products: Collaborative Study

1987 ◽  
Vol 70 (1) ◽  
pp. 55-57
Author(s):  
Daniel E Terry
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Flame Ionization ◽  
Coefficients Of Variation ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method for the determination of isofenphos (OFTANOL®) in isofenphos technical and liquid formulations has been developed and collaboratively studied by 11 laboratories. Two technical samples and 2 liquid flowable samples were analyzed after shaking/extracting in methanol which contained diisobutyl phthalate as an internal standard. The extracts were analyzed by gas chromatography using an SP-2100 column and either flame ionization or thermal conductivity detection. Coefficients of variation were 0.57 and 1.27% for the technical and formulated products, respectively. The GC method has been adopted official first action as a AOACCTPAC method.

Gas Chromatographic Determination of 1,4-Dioxane in Polysorbate 60 and Polysorbate 80

1979 ◽  
Vol 62 (4) ◽  
pp. 931-936
Author(s):  
Thomas J Birkel ◽  
Charles R Warner ◽  
Thomas Fazio
Keyword(s):  
Quantitative Determination ◽  
Vacuum Distillation ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Polysorbate 80 ◽  
Flame Ionization ◽  
The Matrix ◽  
Carrier Solvent ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is presented for the quantitative determination of 1,4- dioxane in polysorbate 60 and polysorbate 80. Dioxane is isolated from the matrix by closedsystem vacuum distillation with water as the carrier solvent. The distillate is chromatographed on Chromosorb 104 and detected by flame ionization. Recoveries of dioxane from polysorbate 60 samples fortified at 0.5, 1, 2, and 20 ppm averaged 90, 91, 85, and 75%, respectively. Recoveries from polysorbate 80 fortified at the same levels averaged 100, 88, 95, and 95%, respectively. Samples of polysorbate 60 and polysorbate 80 were found to contain from 5.5 to 378 ppm dioxane.

Gas Chromatographic Determination of Butylated Hydroxyanisole and Butylated Hydroxytoluene in Breakfast Cereals

1966 ◽  
Vol 49 (4) ◽  
pp. 704-707
Author(s):  
David M Takahashi
Keyword(s):  
Chromatographic Method ◽  
Silicone Oil ◽  
Chromatographic Determination ◽  
Butylated Hydroxytoluene ◽  
Butylated Hydroxyanisole ◽  
Ionization Detector ◽  
Breakfast Cereals ◽  
Gas Chromatographic Method

Abstract The gas chromatographic method for antioxidants (butylated hydroxyanisole and butylated hydroxytoluene) in corn and rice ready-to-eat breakfast cereals was studied collaboratively. The method employs a column of 80–100 mesh acid-washed Chromosorb P, with a 20% coating of DC-200 silicone oil; an argon ionization detector with a radium source was used. Results were in the 90–110% range, when the instructions were followed exactly. Recoveries ranged between 10 and 180% under conditions deviating from the proposed method. In view of the inconclusive results, it is recommended that the written procedure be revised and that the method be restudied collaboratively.

Gas-Liquid Chromatographic Determination of d-trans-Allethrin

1972 ◽  
Vol 55 (5) ◽  
pp. 907-912
Author(s):  
Vernon J Meinen
Keyword(s):  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Technical Material ◽  
Aoac Method ◽  
Liquid Chromatographic Determination ◽  
Gas Chromatographic Method ◽  
Liquid Chromatographic

Abstract A gas chromatographic method is described for the quantitative determination of d-trans-allethrin in the technical product and in various formulations. The samples are diluted with acetone and analyzed by gas chromatography, using a flame ionization detector and a column packed with OV-1 on Chromosorb W (HP). Preliminary work indicates that satisfactory results can be obtained with the technical material and several different formulations. Since this method is more rapid and specific than the present AOAC titrimetric method, it is expected that it will be a valuable supplement to or alternative for the AOAC method for the analysis of allethrin.

Gas Chromatographic Determination of N-Butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-toluidine and α,α,α-Trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine in Formulations

1971 ◽  
Vol 54 (3) ◽  
pp. 711-712
Author(s):  
Martha Fuzesi
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Electron Capture ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Electron Capture Detector ◽  
Reference Solution ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for the quantitative determination of N-butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-tolindine and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyI-p-toluidine herbicides in formulations. The sample is extracted with benzene, and equal amounts of sample and reference solution in the same concentration range are analyzed by gas chromatography, using an electron capture detector and an SE-30/Diatoport S column. The method has been applied successfully to laboratory-prepared and commercial samples.

Collaborative Study of a Gas Chromatographic Method for Ronnel in Feeds

1969 ◽  
Vol 52 (3) ◽  
pp. 435-438
Author(s):  
Albert J Gehrt
Keyword(s):  
Chromatographic Method ◽  
Collaborative Study ◽  
Flame Ionization Detector ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Coefficients Of Variation ◽  
Chromatographic Measurement ◽  
Cattle Feeds ◽  
Gas Chromatographic Method

Abstract A GLC method (flame ionization detector) for ronnel in cattle feeds at levels of 0.038, 0.041, and 0.055% was studied by 11 collaborators. The method involves extraction of ronnel by shaking with acetone followed by direct chromatographic measurement. The method is simple and rapid (no cleanup required), measures true ronnel, and is free from interferences present in the UV methods previously studied. Agreement between laboratories was satisfactory; coefficients of variation were 11.0, 12.0, and 7.2%. Ronnel recoveries were 81.1, 93.5, and 98.0%. Low recovery from the first sample may be due to ronnel hydrolysis or binding during storage (sample was 8 months old). The Associate Keferee recommends that the method be adopted as official first action.

Gas Chromatographic Determination of Fensulfothion in Formulations: Collaborative Study

1986 ◽  
Vol 69 (3) ◽  
pp. 488-490
Author(s):  
William R Betker ◽  
◽  
E W Balcer ◽  
O O Bennett ◽  
W R Coffman ◽  
...  
Keyword(s):  
Chromatographic Method ◽  
Methylene Chloride ◽  
Collaborative Study ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Gas Chromatograph ◽  
Technical Product ◽  
Coefficients Of Variation ◽  
Gas Chromatographic Method

Abstract A collaborative study was conducted on a gas chromatographic method for determination of fensulfothion. Eleven laboratories analyzed 2 technical and two 6 lb/U.S. gal. spray concentrate samples. In the analysis, samples are dissolved in methylene chloride which contains 4-chlorophenyl sulfoxide as an internal standard, and solutions are injected into a gas chromatograph equipped with an OV-330 column. Withinlaboratory repeatability was 0.79% for technical product and 0.37% for the spray concentrate samples, with coefficients of variation of 0.88 and 0.58%, respectively. Among-laboratories reproducibility was 0.81% for technical product and 0.53% for the spray concentrate, with coefficients of variation of 0.91 and 0.84%, respectively. The method has been adopted official first action.

Gas-Liquid Chromatographic Determination of IV-Octylbicycloheptene Dicarboximide

1975 ◽  
Vol 58 (4) ◽  
pp. 845-849
Author(s):  
Vernon J Meinen
Keyword(s):  
Quantitative Determination ◽  
Chromatographic Determination ◽  
Flame Ionization Detector ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Preliminary Work ◽  
Technical Material ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A gas-liquid chromatographic (GLC) method is described for the quantitative determination of /V-octylbicycloheptene dicarboximide (MGK 264 synergist) in technical materials and in various formulations. The samples are diluted with acetone and analyzed by GLC, using a flame ionization detector and a column packed with OV-1 on Chromosorb W (HP). Preliminary work indicates that satisfactory results can be obtained with the technical material and several different formulations.

Headspace Gas Chromatographic Method for Determination of Ethanol in Canned Salmon: Collaborative Study

1986 ◽  
Vol 69 (3) ◽  
pp. 524-526
Author(s):  
Thomas A Hollingworth ◽  
Harold R Throm ◽  
Marleen M Wekell ◽  
William F Trager ◽  
Michael W O’Donnell ◽  
...  
Keyword(s):  
Chromatographic Method ◽  
Collaborative Study ◽  
Internal Standard ◽  
Sampling Technique ◽  
Flame Ionization ◽  
Coefficients Of Variation ◽  
Headspace Gas ◽  
The Mean ◽  
Gas Chromatographic Method

Abstract Six laboratories collaboratively studied a headspace gas chromatographic method for determination of ethanol in the aqueous phase of canned salmon. Ethanol is determined by a headspace sampling technique with tert-butanol as the internal standard, using a gas chromatograph equipped with a Super Q column and a flame ionization detector. With outliers excluded, the mean recoveries from samples spiked with 25.1 and 78.4 ppm ethanol were 112 and 110%, respectively. For the 4 sample pairs quantitated, repeatability coefficients of variation ranged from 1.42 to 4.25% and reproducibility coefficients of variation from 2.55 to 8.09%, with 3 of the 4 reported values less than 5%. The method has been adopted official first action.

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