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207 records · Page 12Linked to original sources
PubMed1990

[Gas chromatographic determination of azinphos-methyl in imported crops].

A gas chromatographic method for the quantitative analysis of azinphos-methyl in agricultural products was studied. Azinphos-methyl was extracted with acetone. The extract was cleaned up by charcoal column chromatography for the treatment of wheat and soybean and by using coagulating reagent for the treatment of lemon and orange, then determined by a gas chromatograph equipped with a flame photometric detector (FPD). The mean recovery of azinphos-methyl added to wheat, soybean and lemon at the level of 0.1 or 0.2 microgram/g was 96.6-101.0%. The detection limit of azinphos-methyl was 0.04 microgram/g in the case of wheat and soybean extracted from 10 g of each sample and 0.02 microgram/g in the case of lemon and orange extracted from 20 g of each sample. Azinphos-methyl was not detected in any of the imported, 6 wheat, 6 soybean, 5 lemon and 4 orange tested using the above mentioned method.

Agriculture↗
PubMedDate not supplied

Passive diffusion through polymeric membranes: a novel cleanup procedure for analysis of azinphos-methyl and azinphos-ethyl residues in fruits and vegetables.

A novel procedure is described for simple removal of coextractives prior to analysis of fruits and vegetables for azinphos-methyl and azinphos-ethyl residues. The solvent extract is concentrated, placed in a polymeric membrane tube, and then dialyzed in cyclohexane. Both azinphos-methyl and azinphos-ethyl diffuse into the surrounding solvent while coextractants remain inside the membrane. The dialyzing solvent is exchanged during concentration with n-hexane and analyzed without further cleanup by gas-liquid chromatography with a specific thermionic detector. The detection limit for a 25 g grape sample with final volume of extract made to 15 mL was 0.01 mg/kg. Recoveries of both residues from grapes averaged 107% (spike levels of 0.3 to 2.0 mg/kg). From a 20 g spinach sample, recoveries averaged 82% for azinphos-methyl and 72% for azinphos-ethyl when final volume of extract was made to 5 mL (spike levels of 0.1 to 1.0 mg/kg). Recoveries from 20 types of fruits and vegetables (20 g sample spiked at 1 mg/kg for both azinphos-methyl and azinphos-ethyl) were consistently greater than 70%, except for strawberries (61-67%) and avocado (28-34%). The high lipid content of avocado may impede diffusion of azinphos-methyl and azinphos-ethyl through the polymeric membrane. A field evaluation of the procedure showed a strong correlation (r = 0.957) between azinphos-methyl residues on grapes and treatments with 2 spray formulations. The membrane cleanup procedure is a simple and cost-effective alternative to other column or liquid-liquid partitioning procedures for azinphos-methyl and azinphos-ethyl residue analysis.

Azinphosmethyl↗
PubMed1977

Liquid chromatographic determination of azinphos methyl oxon in foliar dislodgeable residues and in soil surface dusts from an azinphos methyl-treated orange grove.

Specific parts of the worker environment in an orange grove that had been sprayed with azinphos methyl formulation were tested for azinphos methyl oxon. Extracts of soil surface dusts and dislodgeable residues from orange leaf surfaces were prepared and analyzed by liquid chromatographic procedures incorporating an ultraviolet absorption detector primarily for quantitation and an on-stream chemical reaction detector primarily for confirmation. Azinphos methyl oxon residues were found in both types of samples collected 3-59 days after spraying. Foliar dislodgeable residues of the oxon ranged from a high of 0.057 microgram/sq cm of leaf surface on the 17th day to a low of 0.014 microgram/sq cm on the 59th day for trees treated with a low-volume spray. The corresponding range in soil dust samples was 5.2 microgram/g (ppm) of dust on the 10th day to 1.4 microgram/g on the 59th day. Values were 9.7 and 2.7 microgram/g, respectively, for samples from under trees similarly treated with a high-volume spray.

Azinphosmethyl↗
PubMed1976

Gas-liquid chromatographic determination of azinphos ethyl in human plasma and in mouse plasma, tissue, and fat.

A new method for the determination of azinphos ethyl (O,O-diethyl-S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate) in human plasma and in mouse plasma, tissue, and fat has been developed. The method is based on extraction with benzene or hexane and cleanup of fat and tissue samples by a minicolumn containing Florisil and sodium sulfate. Azinphos ethyl is eluted from the column with 10% acetonitrile in benzene and is concentrated to an appropriate volume for gas-liquid chromatographic analysis, using a 63Ni electron capture detector and a glass column containing 3% OV-1 on Gas-Chrom Q. The method is sensitive to 0.005 ppm in human plasma, 0.01 ppm in mouse plasma, 0.08 ppm in mouse liver, 0.05 ppm in mouse brain, and 0.10 ppm in mouse fat. The limit of detection is 2 pg; mean recoveries ranged from 96 to 98%.

Adipose Tissue↗