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PubMedDate not supplied

Ion-pairing liquid chromatographic determination of benzimidazole fungicides in foods.

A method is described for determining residues in foods of thiabendazole, thiophanate methyl, the di-oxygen analogue metabolite [dimethyl 4,4'-O-phenylene bis (allophanate)] that is the metabolite name of the latter, and methyl-2-benzimidazole carbamate, which is the major metabolite and fungitoxic principle common to both thiophanate methyl and benomyl. The residues are extracted from the product using methanol and are partitioned into dichloromethane after initial acidification and again after subsequent alkalinization of the extract. Residues are separated and quantified by reverse-phase liquid chromatography using an ion-pairing mobile phase with UV and fluorescence detectors in tandem. Recoveries from 7 different food crops fortified at 0.2-35 ppm levels ranged from 64 to 105%.

Benomyl↗
PubMedDate not supplied

Gas chromatographic determination of systemic fungicide tricyclazole in soil and water.

A method is described for determination of tricyclazole residues in soil and water. Tricyclazole is extracted from soil by refluxing with ethyl acetate-acetone (80 + 20 v/v) and from water by partitioning into dichloromethane. The soil extract is purified by coagulation. The compound is detected and measured by gas chromatography using a flame photometer operated in the sulfur mode. Detection limits are 8 ppb for soil and 0.8 ppb for water. Recoveries for control samples fortified with tricyclazole at 0.1-5.0 ppm averaged 97.1% for soil and 108.1% for water.

Chromatography, Gas↗
PubMedDate not supplied

[Delayed neurotoxic action of a new fungicide aphos].

It has been established that administration of aphos to chickens within a wide dose range (3000-25 mg/kg) produces a retarded neurotoxic action that is manifested by the development of ataxia, pareses and paralyses; delay in the rate of the distribution of excitation via the peripheral axons, disorders of myoneural lability; degeneration of myelin fibers, focal granular degradation of myelin. The retarded neurotoxic action is not caused by impurities contained by the technical-grade preparation in view of the fact that such an action is also common to the chemically pure aphos.

Action Potentials↗