Simultaneous determination of captan and captafol in apples and potatoes by thin layer chromatography and in situ fluorometry.
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.
D002215:Captan / Q000032:analysis*; D002855:Chromatography, Thin Layer / Q000379:methods; D005470:Fluorometry / Q000379:methods; D005638:Fruit / Q000032:analysis*; D005659:Fungicides, Industrial / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis; D010797:Phthalimides / Q000032:analysis*; D014675:Vegetables / Q000032:analysis*
D005659:Fungicides, Industrial; D010573:Pesticide Residues; D010797:Phthalimides; D002215:Captan