Record Display for the EPA National Library Catalog


Main Title Trend of DDT and Parathion Residues on Apples Grown in Central Washington.
Author Wolfe, Homer R. ; Elliott, Joseph W. ; Durham., William F. ;
CORP Author Environmental Protection Agency, Wenatchee, Wash. Field Studies Section.
Year Published 1959
Stock Number PB-277 581
Additional Subjects Pesticides ; Apples ; DDT ; Chlorine organic compounds ; Chlorohydrocarbons ; Concentration(Composition) ; Phosphorus organic compounds ; Sulfur organic compounds ; Nitro compounds ; Washington(State) ; Reprints ; Pesticide residues ; Parathion ; Phosphorothioic acid/O-O-(dimethyl-ester)-O-(nitrophenyl-ester)
Library Call Number Additional Info Location Last
NTIS  PB-277 581 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 5p
A study was carried out in 1958 to determine the average amounts of DDT and parathion residue on apples in central Washington and to compare these residues with those found in past years when fewer and earlier sprays and lower dosages were used. The DDT residue levels ranged from 0.3 to 12.4 p.p.m. with a mean of 3.0 p.p.m. for all samples, both washed and unwashed. For each variety and for all samples considered together, the unwashed apples had a higher DDT residue than the washed samples. Only nine of the unwashed samples (15.2%) and 1 washed sample (1.6%) had residues above the 7 p.p.m. tolerance level. Parathion residue ranged from 0.01 to 0.32 p.p.m. with a mean of 0.10 p.p.m. Washing was found to lower the DDT residue level, but little difference between washing with and without brushes was apparent.