Double-Column Programmed Temperature Gas Chromatography. Volatile Polar Column Packings and Quantitative Aspects.

1962 ◽  
Vol 34 (10) ◽  
pp. 1196-1198 ◽  
Author(s):  
E. M. Emery ◽  
W. E. Koerner
Keyword(s):  
Gas Chromatography ◽  
Polar Column ◽  
Column Packings

scholarly journals Column Packings for Gas Chromatography

Nature ◽  
1958 ◽  
Vol 181 (4609) ◽  
pp. 604-604 ◽  
Author(s):  
D. H. DESTY
Keyword(s):  
Gas Chromatography ◽  
Column Packings

Estimation of Residues of Uracil Herbicides by Gas Chromatography After Evaporative Co-distillation

1968 ◽  
Vol 51 (3) ◽  
pp. 688-690
Author(s):  
W H Gutenmann ◽  
D J Lisk
Keyword(s):  
Gas Chromatography ◽  
Ethyl Acetate ◽  
Electron Affinity ◽  
Chromatographic Method ◽  
Polar Column ◽  
Sample Extraction ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method has been developed for estimation of residues of uracil herbicides. The method involves sample extraction by blending with ethyl acetate, isolation of the herbicides by evaporative co-distillation, and electron affinity detection following chromatography on a Ucon Polar column. The procedure has been used to recover 0.04—0.4 ppm of bromacil added to soil and 0.5—1.0 ppm of terbacil added to alfalfa.

Procedure for Nine Organothiophosphate Pesticide Residues on Fruits and Vegetables, Using Microcoulometric Gas Chromatography

1967 ◽  
Vol 50 (4) ◽  
pp. 922-926
Author(s):  
Richard C Nelson
Keyword(s):  
Gas Chromatography ◽  
Sulfur Dioxide ◽  
Petroleum Ether ◽  
Pesticide Residues ◽  
Fruits And Vegetables ◽  
Methyl Parathion ◽  
Water Soluble ◽  
Chlorinated Pesticides ◽  
Florisil Column ◽  
Column Packings

Abstract A method, using microcoulometric gas chromatography (sulfur dioxide detector), is proposed for determining 9 organothiophosphate pesticide residues in fruits and vegetables. Extraction and cleanup principles and procedures are those used in the Mills-Onley-Gaither method for chlorinated pesticides, with modifications, particularly in the Florisil cleanup step. Recoveries of the compounds (sulfotepp, Thimet, diazinon, Di-Syston, methyl parathion, parathion, ethion, Trithion, and EI'IV) from crops fortified just prior to extraction ranged from 73 to 109%, with an overall average of 92%. Average recoveries of individual thiophosphates ranged from 82 to 99%. Recoveries were made at low (0.1— 0.2), intermediate (0.5), and high (2.0- 3.0) ppm levels. Cleanup on all crops tested was adequate for the detector used. In addition to the above compounds, malathion was quantitatively cluted from the Florisil column with an additional eluting mixture of higher polarity. Studies of the method should be continued to include both petroleum ether- and water-soluble compounds, and additional column packings will be investigated.

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