title: Photochemically induced artifact in the analysis of soil for residues of organochlorine pesticides.
abstract: After solvent extraction of soil and clean-up of the extract there is a possibility of reactions being induced photochemically in the solvent phase. In one recent instance such reactions, proceeding relatively quickly during 6-8 days, produced unknown compound(s) whose retention time in a column of 10% DC-200 on 80/100 mesh Gas Chrom Q coincided with that of pp'-DDT. Such interference could be eliminated by later treatment of the extract with concentrated sulphuric acid.
mesh_terms: D002849:Chromatography, Gas; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides / Q000032:analysis*; D008722:Methods; D010573:Pesticide Residues / Q000032:analysis*; D010777:Photochemistry; D012987:Soil / Q000032:analysis*
chemical_list: D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D010573:Pesticide Residues; D012987:Soil