Column packings with immobilized methyl polysiloxane phases for gas chromatography

1991 ◽  
Vol 31 (5-6) ◽  
pp. 258-262 ◽  
Author(s):  
J. Gawdzik
Keyword(s):  
Gas Chromatography ◽  
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

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.

Temperature-Programmed Gas Chromatography of 20 Phosphorus-Containing Insecticides on 4 Different Columns and Its Application to the Analysis of Milk and Corn Silage

1967 ◽  
Vol 50 (6) ◽  
pp. 1228-1236
Author(s):  
M C Bowman ◽  
Morton Beroza
Keyword(s):  
Gas Chromatography ◽  
Corn Silage ◽  
Good Sensitivity ◽  
Multicomponent Analysis ◽  
Relative Retention ◽  
Phosphorus Containing ◽  
Temperature Programmed ◽  
Column Packings ◽  
Sulfur Containing ◽  
Better Than

Abstract Relative retention times and conditions for the gas chromatography of 20 phosphorus- containing insecticides on 4 column packings, DC-200, QF-1, DC-710, and stabilized DEGS, have been determined. With temperature programming, it is possible to analyze compounds of widely differing volatilities in a single run with good sensitivity and a large saving in time. Compounds were detected with the flame photometric detector of Brody and Chaney in both the phosphorus- and sulfur-sensing modes and were identified in milk and corn silage at levels as low as 0.01 ppm. Recoveries of the insecticides from corn silage exceeded 90% and more often were better than 95%; those from milk were at least 80% and usually were above 90%. The gas chromatography in a single multicomponent analysis required from 12 to 28 minutes. The procedure shows promise for identification or multicomponent analysis of phosphorus- and sulfur-containing pesticides as well as for the monitoring of foodstuffs and forage for these pesticides

Sign in / Sign up

Export Citation Format

Share Document