scholarly journals Determination of Trichlorfon Pesticide Residues in Milk via Gas Chromatography with μ-Electron Capture Detection and GC-MS

2010 ◽  
Vol 26 (2) ◽  
pp. 149-155 ◽  
Author(s):  
Lina Hem ◽  
Sathya Khay ◽  
Jeong-Heui Choi ◽  
E.D. Morgan ◽  
A.M. Abd El-Aty ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Electron Capture Detection

scholarly journals Determination of Organochlorine, Organophosphorus, and Triazine Pesticide Residues in Wine by Gas Chromatography with Electron Capture and Nitrogen–Phosphorus Detection

1996 ◽  
Vol 79 (6) ◽  
pp. 1423-1427 ◽  
Author(s):  
Rosario Garcia-Repetto ◽  
Isabel Garrtoo ◽  
Manuel Repetto
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Solid Phase ◽  
Electron Capture Detection ◽  
Gel Chromatography ◽  
Phase Extraction ◽  
Silica Gel Chromatography ◽  
Nitrogen Phosphorus

Abstract A multiresidue analytical method is described for determining 6 pesticides in wine: chlorpyrifos, dimethoate, quinalphos, simazine, tetradifon, and endosulfan. Wine (200 mL) is extracted with dichloromethane (50 mL, 3 times), and the evaporated extracts are purified by silica gel chromatography. Pesticide residues are eluted with n-hexane, n-hexane-benzene (1 + 1), benzene, benzene–acetone (1 + 1), and acetone. Residues are determined by gas chromatography with nitrogen–phosphorus and electron capture detection, using CPSH-5CB, Carbo wax-20M, and CPSH-19CB columns. Recoveries of pesticides added at 0.025 μg/L were 83–97%, with standard deviations of 0.01–0.05%. Detection limits were 0.13–8.9 ng/L, except for simazine (36.7 μg/L). Results are compared with those obtained with a solid-phase extraction (C18) purification and with different eluant series.

scholarly journals Gas Chromatographic Determination of Pesticide Residues in Malt, Spent Grains, Wort, and Beer with Electron Capture Detection and Mass Spectrometry

2007 ◽  
Vol 90 (2) ◽  
pp. 544-549 ◽  
Author(s):  
Nuria Vela ◽  
Gabriel Prez ◽  
Gins Navarro ◽  
Simn Navarro
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Selected Ion Monitoring ◽  
Spent Grains ◽  
Relative Standard

Abstract A method for the simultaneous determination of 9 pesticides (dinitroanilines, organophosphorus, triazoles, and pyrimidines) in several products (malt, spent grains, wort, and beer) of the beer industry is reported. Solid samples (malt and spent grains) are extracted by homogenization with a waterhexane mixture, and the pesticides are partitioned with dichloromethane. Liquid samples (wort and beer) are extracted by sonication with a hexanedichloromethane mixture. Determination of pesticide residues was made by capillary gas chromatography with an electron capture detector (ECD). Confirmation of the compounds was performed by gas chromatography/ion trap mass spectrometry in the selected ion monitoring mode. Detection limits for GCECD varied from 0.2 to 5.5 pg for trifluralin and malathion, respectively. Recoveries of the pesticides from spiked samples ranged from 81.2 to 113.7% with a relative standard deviation between 3.47.5%. The method presents good linearity over the studied range (0.0052 g/mL). The proposed method is rapid and reliable and can be useful for routine monitoring during brewing.

Simple, Low-Cost Method for Determination of Selected Chlorinated Pesticides in Fat Samples

1982 ◽  
Vol 65 (3) ◽  
pp. 677-679 ◽  
Author(s):  
Stefan M Waliszewski ◽  
Grzegorz A Szymczyński
Keyword(s):  
Gas Chromatography ◽  
Petroleum Ether ◽  
Electron Capture ◽  
Silica Gel ◽  
Pesticide Residues ◽  
Low Cost ◽  
Electron Capture Detection ◽  
Chlorinated Pesticides ◽  
Qualitative Determination

Abstract A method is described for the quantitative and qualitative determination of selected chlorinated pesticides in fat samples. Pesticide residues are extracted with petroleum ether and separated from fat with concentrated H2SO4 instead of the commonly used adsorbents Florisil, alumina, or silica gel. Residues were analyzed by gas chromatography with electron capture detection. Recoveries of fortified samples were approximately 100%.

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