Chemical derivatization of herbicide residues for gas liquid chromatographic analysis

Khan, Shahamat U.

doi:10.1007/978-1-4612-9863-2_2

Cited by 8 publications

(3 citation statements)

References 99 publications

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“…They reported recoveries of hydroxy-atrazine of about 70%. Khan (1975) and Cochrane (1975) reviewed the procedures for the derivatization of herbicide residues for GLC analysis. They noted that the methylation, silylation, or chlorination of hydroxy-s-triazines did not give high yields because of tautomerization of the proton of the hydroxy group with the nitrogen on the triazine ring.…”

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A method for the routine semiquantitative determination of hydroxy-s-triazines in soils

Muir¹,

Baker²

1978

J. Agric. Food Chem.

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A method is described for the routine, semiquantitative determination of several nonvolatile degradation products of thetriazine herbicides atrazine, cyanazine, and cyprazine in soil samples. The procedure involves the extraction of soil samples with aqueous methanol and with a methanol-hydrochloric acid mixture and the partition of the chloro-s-triazines into ethyl acetate. The aqueous extract which contained the hydroxy-s-triazines was cleaned up by use of a column of cationic exchange resin; the hydroxys-triazines were converted to their methoxy derivatives by methylation with diazomethane. Gas chromatographic analysis was carried out by use of a Hall electrolytic conductivity detector (nitrogen mode). Recovery studies indicated that hydroxy-atrazine [2-hydroxy-4-(ethylamino)-6-(isopropylamino)-s-triazine], hydroxy-cyprazine [2-hydroxy-4-(cyclopropylamino)-6-(isopropylamino)-s-triazine] , and cyanazine I11 [2-chloro-4-(l-carboxy-l-methylethylamino)-6-(ethylamino)-s-triazine] could be extracted relatively more efficiently from fortified (37.8-790.0 pg/kg) soil samples than could N-dealkylated hydroxy-s-triazines. Overall recoveries of the hydroxy-s-triazines from soil were reduced by the poor efficiency of methylation to the corresponding methoxy-s-triazines.The hydroxy-s-triazines are the major degradation products of the chloro-s-triazine herbicides in soil. The determination of the hydroxy degradation products is made difficult by their low solubility in nonacid or nonalkaline solvent systems (Ward and Weber, 1968), strong adsorption to organic matter and clay surfaces of soils (Weber, 1972), and low efficiency of derivatization for gas chromatographic analysis (Cochrane, 1975).

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A method for the routine semiquantitative determination of hydroxy-s-triazines in soils

Muir¹,

Baker²

1978

J. Agric. Food Chem.

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“…Trifluoroacetylation was carried out as described in the literature (Drozd, 1975;Cochrane, 1975; Khan, 1975). The reactions proceeded in the normal manner resulting in the N-H moiety being converted to N-CO-CF3.…”

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Induction of paraoxon dealkylation by hexachlorobenzene (HCB) and mirex

Iverson¹

1976

J. Agric. Food Chem.

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“…Since GLC has proven to be such a useful tool for trace organic analysis, much effort has been put into the formation of stable derivatives of compounds which otherwise could not be analyzed by GLC. Evidence of such work appears in recent reviews on chemical derivatization in gas chromatography (Cochrane, 1975;Drozd, 1975;Khan, 1975). These papers discuss many reactions for forming derivatives suitable for GLC both in terms of chromatographic behavior and detector sensitivity.…”

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Confirmation of some organonitrogen herbicides and fungicides by chemical derivatization and gas chromatography

Lawrence¹

1976

J. Agric. Food Chem.

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Chemical derivatization of herbicide residues for gas liquid chromatographic analysis

Cited by 8 publications

References 99 publications

A method for the routine semiquantitative determination of hydroxy-s-triazines in soils

A method for the routine semiquantitative determination of hydroxy-s-triazines in soils

Induction of paraoxon dealkylation by hexachlorobenzene (HCB) and mirex

Confirmation of some organonitrogen herbicides and fungicides by chemical derivatization and gas chromatography

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