Collaborative Study of a Gas Chromatographic Method for Ipronidazole in Feeds

1971 ◽  
Vol 54 (1) ◽  
pp. 72-74
Author(s):  
Elmer De Ritter ◽  
Modest Osadca
Keyword(s):  
Electron Capture ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Electron Capture Detector ◽  
Coefficients Of Variation ◽  
Gas Chromatographic Method

Abstract A GLC method for ipronidazole in turkey feeds at levels of 0.0033, 0.0066, and 0.0099% was studied by 7 laboratories. Ipronidazole is extracted by shaking with warm 0.2N HCl. An aliquot of the extract is made alkaline and the ipronidazole is extracted with benzene and diluted further for GLC with an electron capture detector. The method is simple, rapid, and free from interference. Agreement between laboratories was very satisfactory; coefficients of variation were 7.1, 3.0, and 8.0%. Recoveries of ipronidazole were 97, 96, and 99%. It is recommended that the method be adopted as official first action and that the study be continued.

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.

Multiresidue Gas Chromatographic Method for Determining Organochlorine Pesticides in Poultry Fat: Collaborative Study

1984 ◽  
Vol 67 (2) ◽  
pp. 284-289 ◽  
Author(s):  
James A Ault ◽  
Tim E Spurgeon ◽  
◽  
M M Anderson ◽  
R Bowers ◽  
...  
Keyword(s):  
Chromatographic Method ◽  
Collaborative Study ◽  
Gel Permeation Chromatography ◽  
Accuracy And Precision ◽  
Coefficients Of Variation ◽  
Poultry Fat ◽  
Gel Permeation ◽  
Detector Method ◽  
Gas Chromatographic Method

Abstract A gas chromatographic electron capture detector method is described for the quantitative determination of organochlorine pesticide residues in poultry fat. The samples are rendered and cleaned up using automated gel permeation chromatography. The collaborative samples consisted of 10 fortified samples and one incurred residue sample, all in duplicate. Fortification levels ranged from 0.15 to 1.0 ppm for a-BHC, lindane, cis- and frans-chlordane, octachlor epoxide, o,p' and p,p'-DDT, p,p'-DDE, p,p'-TDE, hexachlorobenzene, heptachlor epoxide, dieldrin, endrin, methoxychlor, mirex, and toxaphene. The average recovery was 91.9% with a range of 81-102%. The ranges of coefficients of variation were: CVo = 3.39-14.79%; CVL = 0-16.6%; and CVx = 5.82-19.0%. The results indicate accuracy and precision comparable to other official methodology. The method has been adopted official first action.

Multiresidue Gas Chromatographic Method for Determining Organochlorine Pesticides in Meats: Validation Study for Swine and Beef Fats

1985 ◽  
Vol 68 (5) ◽  
pp. 941-944
Author(s):  
James A Ault ◽  
Timothy E Spurgeon ◽  
Douglas S Gillard ◽  
Edward T Mallinson
Keyword(s):  
Organochlorine Pesticides ◽  
Validation Study ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Heptachlor Epoxide ◽  
Average Recovery ◽  
Coefficients Of Variation ◽  
Poultry Fat ◽  
Gas Chromatographic Method

Abstract A validation of a previously studied method for determining organochlorine residues in poultry fat was conducted to extend the usefulness of the method to beef and swine fats. The validation samples consisted of 16 materials all analyzed in duplicate. Fortification levels ranged from 0.02 to 1.2 ppm for a-BHC, lindane, cis- and Irans-chlordane, octachlor epoxide, o,p'- and p,p'-DDT, p,p'-DDE, p,p'-TDE, hexachlorobenzene, heptachlor epoxide, dieldrin, endrin, methoxychlor, mirex, and toxaphene. The average recovery was 101 % with a range of 7 9 - 113%, not including toxaphene. The ranges of coefficients of variation wtreCV. = 0-23.37% and CVX = 3.74-26.19%. The results were comparable to the previous collaborative study of the same method for poultry fat. The extended method has been adopted official first action

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 Method for Determination of Cypermethrin in Pesticide Formulations: Collaborative Study

1987 ◽  
Vol 70 (1) ◽  
pp. 51-53
Author(s):  
J F C Tyler
Keyword(s):  
Chromatographic Method ◽  
Collaborative Study ◽  
Internal Standard ◽  
Coefficients Of Variation ◽  
Pesticide Formulations ◽  
Glass Column ◽  
Technical Material ◽  
Gas Chromatographic Method ◽  
Ethylhexyl Phthalate

Abstract A gas chromatographic method for determination of total cypermethrin in technical and formulated products has been developed and subjected to a collaborative study involving IS participating laboratories. Each sample was dissolved in methyl isobutyl ketone containing di(2-ethylhexyl) phthalate as internal standard and analyzed by gas chromatography on a glass column with 3% OV-101 on Chromosorb W-HP. Each collaborator was furnished with reference stdard and 4 samples of technical material, 3 emulsifiable concentrates, one wettable powder, and one ultralow volume formulation for analysis. The coefficients of variation of the results obtained ranged from 0.955 to 1.7462%. The method has been adopted as official first action by AOAC.

Gas Chromatographic Method for Determination of Permethrin in Pesticide Formulations: Collaborative Study

1987 ◽  
Vol 70 (1) ◽  
pp. 53-55
Author(s):  
J F C Tyler
Keyword(s):  
Chromatographic Method ◽  
Collaborative Study ◽  
Internal Standard ◽  
Isobutyl Ketone ◽  
Coefficients Of Variation ◽  
Pesticide Formulations ◽  
Glass Column ◽  
Technical Material ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method for determination of permethrin in technical and formulated products has been developed and subjected to a collaborative study involving 19 participating laboratories. Each sample was dissolved in methyl isobutyl ketone containing n-octacosane as internal standard and analyzed by gas chromatography on a glass column with 3% OV-210 on Chromosorb W-HP. Each collaborator was furnished with reference standard and 5 samples of technical material (90-95%), 8 emulsifiable concentrates (10-50%), 2 wettable powders (20-30%), one dustable powder (1-2%), and one mter-dispersible granules (1-2%) for analysis. The coefficients of variation of the results obtained ranged from 0.79 to 4.24%. The method has been adopted as official first action by AOAC.

Determination of fluoxetine and norfluoxetine in plasma by gas chromatography with electron-capture detection.

1982 ◽  
Vol 28 (10) ◽  
pp. 2100-2102 ◽  
Author(s):  
J F Nash ◽  
R J Bopp ◽  
R H Carmichael ◽  
K Z Farid ◽  
L Lemberger
Keyword(s):  
Gas Chromatography ◽  
Human Plasma ◽  
Electron Capture ◽  
Relative Error ◽  
Chromatographic Method ◽  
Linear Range ◽  
Electron Capture Detector ◽  
Electron Capture Detection ◽  
Gas Chromatographic Method

Abstract This gas-chromatographic method for assay of fluoxetine and norfluoxetine in human plasma involves extraction of the drugs and use of a 63Ni electron-capture detector. The linear range of detection is 25 to 800 micrograms/L for each drug. Overall precision (CV) in the concentration range of 10 to 100 micrograms/L for both drugs was approximately 10%. Accuracy (relative error) in the same concentration range was approximately +10%. None of the commonly prescribed antidepressants or tranquilizers that we tested interfere with the assay.

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 Chromatographie Determination of Subnanogram Amounts of the Juvenile Hormone Methyl (2E, 6E)-10,ll-epoxy-3,7,ll-tri- methyl-2,6-dodecadienoate (JH III) in Insect Material by Electron Capture Detection

1975 ◽  
Vol 30 (11-12) ◽  
pp. 726-729 ◽  
Author(s):  
L Van Broekhoven ◽  
A Van Der Kerk ◽  
-Van Hoof ◽  
C Salemink
Keyword(s):  
Juvenile Hormone ◽  
Electron Capture ◽  
Chromatographic Method ◽  
Electron Capture Detector ◽  
Electron Capture Detection ◽  
Juvenile Hormones ◽  
Gas Chromatographic Method ◽  
Work Up

Abstract Using an electron capture detector, a sensitive gas chromatographic method has been developed for the determination of the juvenile hormone methyl(2E, 6E)-10, 11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate (JH III) in insect material. The sensitivity in electron capture detection of the bisheptafluorobutyrate was determined. The work-up procedure was checked by adding known amounts of JH III to insect material. The method seems equally applicable to all three juvenile hormones.

Sign in / Sign up

Export Citation Format

Share Document