Capillary electrochromatography–mass spectrometry determination of melamine and related triazine by-products using poly(divinyl benzene-alkene-vinylbenzyl trimethylammonium chloride) monolithic stationary phases

2012 ◽  
Vol 719 ◽  
pp. 96-103 ◽  
Author(s):  
Hsi-Ya Huang ◽  
Cheng-Lan Lin ◽  
Shu-Huei Jiang ◽  
Brenda Singco ◽  
Yi-Jie Cheng
Keyword(s):  
Mass Spectrometry ◽  
Capillary Electrochromatography ◽  
Stationary Phases ◽  
Trimethylammonium Chloride ◽  
Divinyl Benzene ◽  
Monolithic Stationary Phases ◽  
By Products

Method for Determination of Organohalogen Pesticide Residues in Vegetable Oil Refinery By-Products

1984 ◽  
Vol 67 (1) ◽  
pp. 95-106 ◽  
Author(s):  
Susan Young ◽  
Clower Marion ◽  
John A G Roach
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Detection System ◽  
Oil Refinery ◽  
Deodorizer Distillate ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Chromatographic Detection ◽  
By Products

Abstract A method using gel permeation and Florisil column chromatographic cleanup techniques is described for determination of residues of nonpolar organohalogen pesticides and pesticide alteration products in vegetable oils and their refinery by-products. Supplemental Florisil separation and alkali cleanup techniques are used to facilitate determinations. Residues are determined with a 63Ni electron capture gas chromatographic detection system used in conjunction with 3 different gas chromatographic columns. Residue identities are confirmed by gas chromatography-mass spectrometry. Recoveries of 7 organohalogen pesticides, ranging from 90 to 103%, were determined by the supplemental Florisil separation technique to augment previously reported recovery data determined for initial GPC and Florisil cleanup steps. Soybean, peanut, and cottonseed deodorizer distillates and crude and refined oil, as well as additional refinery by-products, were analyzed. Nine to 13 organohalogen residues ranging from 0.5 to 6.3 ppm were determined in the 2 soybean deodorizer distillate samples used to develop and test the method. Identities of residues present at ≥0.3 ppm were confirmed by gas chromatography-mass spectrometry. An intralaboratory trial of the method provided additional recovery and residue determination data as follows: Recoveries ranging from 102 to 116% were obtained for 4 pesticides added to peanut oil deodorizer distillate. Residues determined in 1 soybean deodorizer distillate sample supported previously obtained data for this sample.

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