Determination of Quinomethionate (6-Methylquinoline-2,3-diyldithiocarbonate) Residues in Crops by In Situ Fluorometry

1976 ◽  
Vol 59 (1) ◽  
pp. 172-173
Author(s):  
Yves Francoeur ◽  
Victorin Mallet
Keyword(s):  
Thin Layer ◽  
Quantitative Determination ◽  
Petroleum Ether ◽  
Thin Layer Chromatography ◽  
Pesticide Residue ◽  
Simple Method ◽  
Layer Chromatography ◽  
Ppm Level

Abstract A simple method is described for the quantitative determination of quinomethionate (6-methylquinoline-2,3-diyldithiocarbonate) in crops. The pesticide residue is extracted with acetonitrile and partitioned in petroleum ether. After separation from the co-extractives by thin layer chromatography (TLC), the fluorescence is measured directly on a silica gel TLC plate. An average of 89% recovery is obtained at the 0.05 ppm level in apples, peaches, pears, and tomatoes.

Simultaneous Determination of Captan and Captafol in Apples and Potatoes by Thin Layer Chromatography and in situ Fluorometry

1977 ◽  
Vol 60 (6) ◽  
pp. 1328-1330
Author(s):  
Yves Francoeur ◽  
Victorin Mallet
Keyword(s):  
Thin Layer ◽  
Methylene Chloride ◽  
Sodium Chlorate ◽  
Simple Method ◽  
Fungicide Residues ◽  
Chromatographic Plate ◽  
Layer Chromatography ◽  
Ppm Level

Abstract A simple method is described for the simultaneous quantitative determination of captan [N-(trichloromethylthio)-3a,4,7,7a-tetrahydrophthalimide] and captafol [N-(1,1,2,2-tetrachloroethylthio)-3a,4,7,7a-tetrahydrophthalimide] in apples and potatoes. The fungicide residues are extracted with acetonitrile, partitioned into a solution of methylene chloride in petroleum ether, separated from each other and the co-extractives on a thin layer chromatographic plate impregnated with aluminum chloride, sprayed with sodium chlorate, and heated. The fluorescence is then measured directly from the chromatogram. Recoveries were greater than 90% in the test crops at the 0.2 ppm level.

Simple Method for Determination of Glycine and Niacin in Drug Mixtures

1968 ◽  
Vol 51 (1) ◽  
pp. 11-14
Author(s):  
Keith L Egli ◽  
Anthony Romano
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Ultraviolet Absorption ◽  
Simple Method ◽  
Drug Mixtures ◽  
Layer Chromatography

Abstract A method, based on the formol titration of glycine and the ultraviolet absorption of niacin, has been developed for the determination of these compounds in drug mixtures. Neither compound requires isolation for the determination. Glycine and niacin are identified by thin layer chromatography

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