Rapid and quantitative pentafluorobenzoylation of nitrophenols and other phenolic compounds in water for gas-chromatographic determination with electron capture detection

1989 ◽  
Vol 334 (4) ◽  
pp. 340-343 ◽  
Author(s):  
H. D. Winkeler ◽  
K. Levsen
Keyword(s):  
Phenolic Compounds ◽  
Electron Capture ◽  
Chromatographic Determination ◽  
Electron Capture Detection

Gas Chromatographic Determination of Captan, Folpet, and Captafol Residues in Tomatoes, Cucumbers, and Apples Using a Wide-Bore Capillary Column: Interlaboratory Study

1991 ◽  
Vol 74 (5) ◽  
pp. 830-835 ◽  
Author(s):  
Dalia M Gilvydis ◽  
Stephen M Walters
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Capillary Column ◽  
Chromatographic Determination ◽  
Interlaboratory Study ◽  
Electron Capture Detection ◽  
Coefficients Of Variation ◽  
Capillary Column Gas Chromatography ◽  
Ppm Level

Abstract An interlaboratory study of the determination of captan, folpet, and captafol in tomatoes, cucumbers, and apples was conducted by 4 laboratories using wide-bore capillary column gas chromatography with electron capture detection. The 3 fungicides were determined using the Luke et al. multlresidue method modified to Include additional solvent elutlon in the optional Florisll column cleanup step used with this method. The crops were fortified with each fungicide at 3 levels per crop. Mean recoveries ranged from 86.2% for a 25.1 ppm level of captan in apples to 115.4% for a 0.288 ppm level of captafol In apples. Interlaboratory coefficients of variation ranged from 3.4% (24.7 ppm folpet) to 9.7% (0.243 ppm captafol) for tomatoes; from 2.8% (2.0 ppm captafol) to 8.2% (24.8 ppm captan) for cucumbers; and from 1.5% (0.234 ppm folpet) to 22.1% (0.266 ppm captafol) for apples.

Capillary Column Gas Chromatographic Determination of Dicamba in Water, Including Mass Spectrometric Confirmation

1989 ◽  
Vol 72 (5) ◽  
pp. 840-844
Author(s):  
Nancy C Jimenez ◽  
Yousef H Atallah ◽  
Thomas R Bade
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Ethyl Ether ◽  
Capillary Column ◽  
Chromatographic Determination ◽  
Mass Spectrometric ◽  
Gas Chromatography Mass Spectrometry ◽  
Electron Capture Detection ◽  
Selected Ion Monitoring ◽  
Capillary Column Gas Chromatography

Abstract A sensitive method is described for determining dicamba at low μg/L levels in ground waters by capillary column gas chromatography with electron-capture detection (GC-EC); compound identity is confirmed by gas chromatography-mass spectrometry (GC-MS) using selected ion monitoring. Dicamba residue is hydrolyzed in KOH to form the potassium salt. The sample is then extracted with ethyl ether which is discarded. The aqueous phase is acidified to pH < 1 and extracted twice with ethyl ether. The combined ethyl ether extracts are concentrated, and the residue is methylated using diazomethane to form the corresponding dicamba ester. The derivatized sample is cleaned up on a deactivated silica gel column. The methylated dicamba is separated on an SE-30 capillary column and quantitated by electron-capture or mass spectrometric detection. Average recoveries (X ± SD) for ground water samples fortified with 0.40 μg/L of dicamba are 86 ±5% by GC-EC and 97 ± 7% by GC-MS detections. The EDL (estimated detection limit) for this method is 0.1 μg dicamba/L water (ppb).

Electron Capture Gas Chromatographic Determination of Traces of Formaldehyde in Milk as the 2,4-Dinitrophenylhydrazone

1986 ◽  
Vol 69 (4) ◽  
pp. 655-657
Author(s):  
Katherine E Buckley ◽  
Lorne J Fisher ◽  
Vernon G MacKay
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Quantitative Method ◽  
Chromatographic Method ◽  
Packed Column ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
External Standard

Abstract A quantitative method is described for the determination of formaldehyde in milk by packed-column gas chromatography and electron capture detection. Aldehyde derivatization was carried out in situ with 2,4-dinitrophenyIhydrazine followed by extraction and analysis using an external standard. Average recoveries of 96.3 ± 1.6% were characteristic of the chromatographic method with an estimated detection limit of 0.026 mg/kg. The technique was applied to determination of formaldehyde in milk from cows consuming a formalin-treated feedstuff.

Gas Chromatographic Determination of Deoxynivalenol in Wheat with Electron Capture Detection: Collaborative Study

1986 ◽  
Vol 69 (5) ◽  
pp. 899-901 ◽  
Author(s):  
George M Ware ◽  
Octave J Francis ◽  
Allen S Carman ◽  
Shia S Kuan ◽  
◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Collaborative Study ◽  
Control Sample ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Average Recovery ◽  
Repeatability And Reproducibility ◽  
The Mean

Abstract Ten laboratories participated in a collaborative study of a method for the determination of deoxynivalenol in wheat by gas chromatography with electron capture detection. Each laboratory analyzed 6 samples in duplicate. Each collaborator received samples spiked at the 100.3, 501.3, and 1002.6 ng/g levels; a control sample; and 2 naturally contaminated samples. The average recovery (outliers excluded) for the spiked samples was 92.2%. The mean repeatability and reproducibility, respectively, were 32.2 and 41.3% for the spiked samples and 30.9 and 47.6% for the naturally contaminated samples. The method was adopted official first action.

Gas Chromatographic Determination of Guanabenz in Biological Fluids by Electron-Capture Detection

1982 ◽  
Vol 71 (6) ◽  
pp. 710-711 ◽  
Author(s):  
John A. Knowles ◽  
Grace R. White ◽  
Constance J. Kick ◽  
Taylor B. Spangler ◽  
Hans W. Ruelius
Keyword(s):  
Electron Capture ◽  
Biological Fluids ◽  
Chromatographic Determination ◽  
Electron Capture Detection
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