Modifications of the micromethod of sample cleanup for thin-layer and gas chromatographic separation and determination of common organic pesticide residues

1968 ◽  
Vol 3 (6) ◽  
pp. 354-359 ◽  
Author(s):  
A. M. Kadoum
Keyword(s):  
Thin Layer ◽  
Chromatographic Separation ◽  
Pesticide Residues ◽  
Gas Chromatographic Separation

Additional Cleanup of Samples on GLC Column for TLC Determination of Pesticide Residues

1967 ◽  
Vol 50 (3) ◽  
pp. 615-623
Author(s):  
Kenneth T Hartman
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Pesticide Residues ◽  
Gas Liquid Chromatography ◽  
Rf Values ◽  
Layer Chromatography

Abstract Gas-liquid chromatography (GLC) following conventional isolation procedures has been used to clean up pesticide residues for confirmation by thin layer chromatography (TLC). This procedure is more rapid and efficient than present cleanup procedures and permits the determination of pesticide residues that do not survive these rigorous acid or alkali treatments. The method also permits TLC confirmation of pesticide residues that have similar Rf values but different GLC retention times. Recoveries ranged from 85 to 105% for 25 of 28 pesticides tested

General Method for Determination of Pesticide Residues in Samples of Plant Origin, Soil, and Water. II. Thin Layer Chromatographic Determination

1981 ◽  
Vol 64 (3) ◽  
pp. 743-748 ◽  
Author(s):  
Árpád Ambrus ◽  
Éva Hargitai ◽  
Gabriella Károly ◽  
András Fülöp Ambrus ◽  
János Lantos Ambrus
Keyword(s):  
Thin Layer ◽  
Pesticide Residues ◽  
Unknown Origin ◽  
Chromatographic Determination ◽  
Plant Origin ◽  
Coefficients Of Variation ◽  
Rf Values ◽  
Soil And Water ◽  
General Method

Abstract o-Tolidine plus KI, p-nitrobenzene-diazoniumfluoroborate, bioassay with fungi and enzyme sources, AgNO3 plus UV radiation, and p-dimethyl-aminobenzaldehyde modes of detection have been selected for TLC screening of pesticide residues in extracts of samples of unknown origin. Single solvents were used for the elution. Coefficients of variation of Rf values were studied as a function of Rf and eluants. Indicator compounds were used for controlling the proper conditions of detection. The detectability of 188 pesticide compounds was tested, and the minimum detectable amounts were determined.

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