Gas Chromatographic Determination of Mecarbam and Its Metabolites Mecarboxon, Diethoate, and Diethoxon in Cottonseeds

1987 ◽  
Vol 70 (5) ◽  
pp. 870-874
Author(s):  
Rachel S Greenberg
Keyword(s):  
Silica Gel ◽  
Propylene Carbonate ◽  
Chromatographic Method ◽  
Soxhlet Extraction ◽  
Chromatographic Determination ◽  
Alumina Column ◽  
Flame Photometric Detector ◽  
Average Recovery ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for determining residues of mecarbam and 3 of its metabolites, mecarboxon, diethoate, and diethoxon, in cottonseeds. For mecarbam analysis, following Soxhlet extraction with chloroform (after blending), the oily extract is partitioned with propylene carbonate and cleaned up on a silica gel column. Metabolites are extracted by the same method, followed by cleanup of mecarboxon on a silica gel column or diethoxon on an alumina column; cleanup of diethoate can be performed on either column. AH 4 compounds are determined using a flame photometric detector equipped with a phosphorus filter. Average recoveries for cottonseed samples fortified with 0.03-1.0 ppm mecarbam ranged from 80 to 88%. Average recoveries were 81-88% for mecarboxon and 90-92% for diethoate (alumina column) and diethoxon from samples fortified with 0.05-1.0 ppm. Average recovery of diethoate from samples cleaned up on the silica gel column were 84-88% in the range of 0.05-0.2 ppm. Values obtained for mecarbam residues in field-treated samples are also presented.

Gas Chromatographic Determination of Trace Amounts of the Insect Chemosterilants Tepa, Metepa, Methiotepa, Hempa, and Apholate and the Analysis of Tepa in Insect Tissue

1966 ◽  
Vol 49 (5) ◽  
pp. 1046-1052
Author(s):  
Malcolm C Bowman ◽  
Morton Beroza
Keyword(s):  
Chromatographic Analysis ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Radiometric Method ◽  
Detector Response ◽  
Flame Photometric Detector ◽  
Methanol Extracts ◽  
Gas Chromatographic Analysis ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method, sensitive to as little as 0.1 nanogram, was devised for analysis of the insect chemosterilants tepa, metepa, methiotepa, hempa, and apholate. The method is needed to monitor amounts and persistence of chemosterilant in treated insects. The procedure uses a flame-photometric detector. Response is linear (phosphorus analysis) between 0.1 and at least 200 ng. The procedure was shown to be directly applicable to analysis of methanol extracts of insects fed tepa. Concurrent gas chromatographic and radiometric analyses indicated that the radiometric method would not give satisfactory results without a suitable cleanup, whereas virtually no cleanup was required for the gas chromatographic analysis. The gas chromatographic method is rapid and easily carried out.

Gas Chromatographic Determination of Monitor (O,S-Dimethyl Phosphoramidothioate) Residues in Crops

1971 ◽  
Vol 54 (6) ◽  
pp. 1396-1398
Author(s):  
J B Leary
Keyword(s):  
Gas Chromatography ◽  
Ethyl Acetate ◽  
Silica Gel ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Cesium Bromide ◽  
Ether Solution ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for determining Monitor (0,S-dimethyl phosphoramidothioate) in a variety of crops. After extraction of the sample with ethyl acetate, the solvent is evaporated and an ether solution of the residue is passed through a silica gel column to remove interferences. Monitor is then eluted from the column with acetone and measured by gas chromatography, using a cesium bromide thermionic detector. The majority of standard recovery values ranged between 90 and 100% when samples were fortified at 0.05 to 0.1 ppm.

Gas Chromatographic Determination of N-Butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-toluidine and α,α,α-Trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine in Formulations

1971 ◽  
Vol 54 (3) ◽  
pp. 711-712
Author(s):  
Martha Fuzesi
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Electron Capture ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Electron Capture Detector ◽  
Reference Solution ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for the quantitative determination of N-butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-tolindine and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyI-p-toluidine herbicides in formulations. The sample is extracted with benzene, and equal amounts of sample and reference solution in the same concentration range are analyzed by gas chromatography, using an electron capture detector and an SE-30/Diatoport S column. The method has been applied successfully to laboratory-prepared and commercial samples.

Liquid Chromatographic Determination of Sulfamoyldapsone in Swine Tissues

1987 ◽  
Vol 70 (6) ◽  
pp. 1031-1032
Author(s):  
Yuuko S Endoh ◽  
Ryozo Yamaoka ◽  
Nobuo Sasaki
Keyword(s):  
Detection Limit ◽  
Quantitative Determination ◽  
Chromatographic Determination ◽  
Alumina Column ◽  
Average Recovery ◽  
Diaminodiphenyl Sulfone ◽  
Alumina Column Chromatography ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method is described for the quantitative determination of sulfamoyldapsone (2-sulfamoyl-4,4'-diaminodiphenyl sulfone) in swine muscle, liver, kidney, and fat. Sulfamoyldapsone was extracted from tissues with acetonitrile saturated with n-hexane. The extract was washed with n-hexane saturated with acetonitrile, concentrated, and cleaned up by alumina column chromatography. Sulfamoyldapsone was separated on an ODS column by using acetonitrile-methanol-water (6 + 18 + 76) and was detected at 292 nm. Overall average recovery of sulfamoyldapsone added to tissues at levels of 0.1 and 0.5 /μg/g was 93.3% ± 6.0. Detection limit was 0.02 μg/g in these tissues.

scholarly journals Gas Chromatographic Determination of Chlorothalonil in Leaves and Roots of Scrophularia and in Soil

1996 ◽  
Vol 79 (2) ◽  
pp. 587-588 ◽  
Author(s):  
Lan Zhao ◽  
De-Fang Fan
Keyword(s):  
Electron Capture ◽  
Chromatographic Method ◽  
Detection Limits ◽  
Chromatographic Determination ◽  
Soil Samples ◽  
Florisil Column ◽  
Glass Column ◽  
Leaves And Roots ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for determination of chlorothalonil residues in leaves and roots of Scrophularia and in soil. Samples were extracted with acetone and cleaned up on a Florisil column. Chlorothalonil residues are chromatographed directly on a glass column of 1.5% OV-17 and 2% QF-1 coated on 80-100 mesh Chromosorb W (HP) support and measured with a 63Ni electron capture detector. Detection limits are 0.001 ppm for leaf, 0.005 ppm for root, and 0.001 ppm for soil.

Capillary Column Gas Chromatographic Determination of Trace Residues of the Herbicide Chlorsulfuron in Agricultural Runoff Water

1987 ◽  
Vol 70 (4) ◽  
pp. 745-748
Author(s):  
Uaz Ahmad
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Method ◽  
Capillary Column ◽  
Methylene Chloride ◽  
Chromatographic Determination ◽  
Agricultural Runoff ◽  
Runoff Water ◽  
Florisil Column ◽  
Gas Chromatographic Method

Abstract A capillary column gas chromatographic method is described for determining parts-per-trillion (ppt) levels of chlorsulfuron in agricultural runoff water. The water sample is acidified with acetic acid and extracted with methylene chloride. The chlorsulfuron in the extract is derivatized to its monomethyl derivative. After Florisil column cleanup, the methylated chlorsulfuron is determined by electron-capture gas chromatography. Recovery of chlorsulfuron from fortified water samples is greater than 80%. Detection limit of the method is 25 ng chlorsulfuron/L water (25 ppt). There are 2 reaction sites on the chlorsulfuron molecule, both of which are susceptible to methylation leading to monomethyl chlorsulfuron and dimethyl chlorsulfuron. A procedure is described to methylate selectively the sulfonamide nitrogen of chlorsulfuron.

Gas Chromatographic Determination of Histapyrrodine Hydrochloride in Pharmaceutical Preparations

1986 ◽  
Vol 69 (4) ◽  
pp. 612-613
Author(s):  
Ramesh T Sane ◽  
Vipul J Doshi ◽  
Sanjay K Joshi ◽  
Vijay K Shastri ◽  
Dhananjay S Sapre ◽  
...  
Keyword(s):  
Chromatographic Method ◽  
Internal Standard ◽  
Pharmaceutical Preparations ◽  
Chromatographic Determination ◽  
Chlorpheniramine Maleate ◽  
Accuracy And Precision ◽  
Label Claim ◽  
Gas Chromatographic Method

Abstract A simple gas chromatographic method is described for the determination of histapyrrodine HC1 in marketed formulations. Chlorpheniramine maleate is used as the internal standard. The amount of histapyrrodine HC1 found by the proposed method averaged 19.91 mg/tablet, compared with the label claim of 20 mg/tablet. The method was statistically evaluated for accuracy and precision.

scholarly journals Gas Chromatographic Determination of Butylated Hydroxyanisole (BHA) and Butylated Hydroxytoluene (BHT) in Products Containing Capsaicinoids

1996 ◽  
Vol 79 (6) ◽  
pp. 1459-1462
Author(s):  
Bernard DeWitt ◽  
Gunnar Finne
Keyword(s):  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Butylated Hydroxytoluene ◽  
Butylated Hydroxyanisole ◽  
Liquid Chromatographic Method ◽  
Gas Chromatographic Method ◽  
Liquid Chromatographic

Abstract Because of interference by coeluting capsaicinoids, the commonly used liquid chromatographic method for determining butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) in pepperoni and spice blends is not reliable. A gas chromatographic method is described that cleanly separates these antioxidants from interfering substances. Average recoveries of BHA and BHT from oleoresin spiked at 5 concentrations were 97.6 and 104.3%, respectively. From pepperoni spiked at 4 levels, average recoveries were 79.1 and 87.9%, respectively. The repeatability of the method when applied to 5 replicates of pepperoni toppings was 36.4 ± 1.1 ppm for BHA and 32.2 ± 0.8 ppm for BHT.

scholarly journals Gas Chromatographic Determination of Cyprodinil, Fludioxonil, Pyrimethanil, and Tebuconazole in Grapes, Must, and Wine

1997 ◽  
Vol 80 (4) ◽  
pp. 867-870 ◽  
Author(s):  
Paolo Cabras ◽  
Alberto Angioni ◽  
Vincenzo L Garau ◽  
Elizabeth V Minelli
Keyword(s):  
Chromatographic Method ◽  
High Selectivity ◽  
Chromatographic Determination ◽  
Mass Spectrometric ◽  
On Line ◽  
One Step ◽  
Low Sensitivity ◽  
Gas Chromatographic Method ◽  
Nitrogen Phosphorus

Abstract A rapid and simple gas chromatographic method for determinating cyprodinil, fludioxonil, pyrimethanil, and tebuconazole in grapes, must, and wine is described. An on-line microextraction method was used with a one-step extraction–partition procedure. Nitrogen–phosphorus and mass spectrometric detectors were used, because of their low sensitivity and high selectivity. Because of high selectivity of detector, no cleanup was necessary and the extract was concentrated 5 times. Recoveries from fortified grapes, must, and wine ranged from 93 to 110%. Limits of determination were 0.05 mg/kg for cyprodinil and pyrimethanil and 0.10 mg/kg for fludioxonil and tebuconazole.

Thin Layer Chromatographic Determination of Subsidiary Dyes in D&C Red No. 19 and D&C Red No. 37

1974 ◽  
Vol 57 (4) ◽  
pp. 961-962
Author(s):  
Sandra Bell
Keyword(s):  
Thin Layer ◽  
Silica Gel ◽  
Chromatographic Method ◽  
Chromatographic Determination

Abstract A thin layer chromatographic method is presented by which triethylrhodamine and other lower ethylated subsidiary colors are separated from D&C Red No. 19 and D&C Red No. 37. After removal from the plate, subsidiary dyes are extracted from silica gel C adsorbent and quantitated spectrophotometrically. Recoveries of 1, 2, and 5% of added triethylrhodamine ranged from 89 to 1 0 3% for D&C Red No. 19 and from 85 to 1 0 2% for D&C Red No. 37.

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