Pesticide Residues, Electron Affinity Detector in Pesticide Residue Analysis

Gutenmann, Walter H.; Lisk, D. J.

doi:10.1021/jf60128a008

Cited by 30 publications

(9 citation statements)

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“…Unsatisfactory attempts to increase the sensitivity of carbaryl detection below 1.0 ppm were attributed to the relatively greater proportion of brominated products formed from green bean extract components, compared to the amount of brominated carbaryl. Direct bromination of the acetone-hexane extract of treated apples by Gutenmann and Lisk (1963) yielded an electron capture-sensitive derivative of diphenylamine. Subsequently, Gutenmann and Lisk (1965) converted carbaryl to a brominated 1-naphthyl acetate which was detected in the nanogram range by EC-GLC following hydrolysis, bromination, and acetylation of the parent compound.…”

Section: Becausementioning

confidence: 99%

Determination of carbaryl as an amide derivative by electron-capture gas chromatography

Tilden¹,

Middelem²

1970

J. Agric. Food Chem.

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methylcarbamate insecticides were synthesized and evaluated as to their potential electron capturing properties in a gas chromatograph. One of the most promising derivatives, 4-bromo-A-methylbenzamide, was used to quantitate, by electron capture gas chromatography, carbaryl residues extracted from field-treated spinach and chicory. Sulfuric acid hydrolysis was used to convert carbaryl simultaneously to a methylamine salt and the crop extractives to water-soluble products. Effective separation of the methylamine from the watersoluble extractives was accomplished by making the aqueous phase strongly alkaline which also catalyzed the coupling of the free amine with the 4-bromobenzoyl chloride. To verify the gas chromatographic results, all field samples were also analyzed by the conventional colorimetric procedure for carbaryl. The lower limits of detection were 0.2 ppm for fortified crop extracts by employing the proposed gas chromatographic procedure. Pure standards could be detected at the 20-picogram level.

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Section: Becausementioning

confidence: 99%

Determination of carbaryl as an amide derivative by electron-capture gas chromatography

Tilden¹,

Middelem²

1970

J. Agric. Food Chem.

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“…Bevenue et al (1962) and Yip (1962) determined 2,4-D in dry crops and walnuts using a microcoulometric gas chromatograph. Gutenmann et al (1963) worked on pesticide residue analysis by gas chromatography with an electron affinity detector. Daoud et al (1962) applied the calorimetric method of Marquardt et al (1955) to determine 2,4,5-T residue in canned apricot.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chlorophenoxyacetic Acid Growth‐Regulator Sprays on Residues in Canned Apricots and Grapes

Lee

Luh

1968

Journal of Food Science

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SUMMARY— A, gas‐liquid chromatographic method coupled with an electron capture detector has been developed for analyzing chlorinated phenoxyacetic acid residues in canned fruits. The technique involves converting the acid to its methyl ester with diazomethane, chromatography on a 5% silicone grease SE‐30 column at 210°C, and subsequent detection of the compound by an electron capture detector. As low as 0.02 ppm of the residue could be detected. The method is superior to the calorimetric method because parachlorophenoxyacetic acid (PCPA), 2,4‐D, and 2,4,5‐T can be separated and quantitatively determined simultaneously. However, separate standard curves are needed for each, because they differ in chlorine content and in sensitivity toward the electron capture detector. Levels of 2,4‐D and 2,4,5‐T residues in canned apricots, and of PCPA in canned grapes are reported.

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“…As these methods appeared to lack the selectivity and sensitivity required, a gas chromatographic technique was sought. The method described by Gutenmann and Lisk (1963) in which diphenylamine is converted to an electron-capturing bromo derivative was unsatisfactory because it gave significant blank values with the fruit used and was insufficiently sensitive.…”

mentioning

confidence: 99%

Methods for the determination of diphenylamine residues in apples

Allen¹,

Hall²

1980

J. Agric. Food Chem.

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Two methods for the determination of diphenylamine residues in apple peel were devised and used during a fruit storage experiment. One was based on extraction in a Soxhlet apparatus and formation of the fluorobutyryl derivative for electron-capture gas chromatographic determination; the second method used steam distillation and direct determination of diphenylamine with a nitrogen-sensitive thermionic gas chromatographic detector. The latter method, after correction for recovery losses, gave residue levels ca. one-third higher during the 118 days of the storage experiment.phase and column chromatography on alumina or magnesium oxide/Celite, but none of these were successful. A

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Pesticide Residues, Electron Affinity Detector in Pesticide Residue Analysis

Cited by 30 publications

References 1 publication

Determination of carbaryl as an amide derivative by electron-capture gas chromatography

Determination of carbaryl as an amide derivative by electron-capture gas chromatography

Effect of Chlorophenoxyacetic Acid Growth‐Regulator Sprays on Residues in Canned Apricots and Grapes

Methods for the determination of diphenylamine residues in apples

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