Persistence of Aldrin and Heptachlor Residues on Alfalfa1

Publisher Website
Google Scholar
Abstract
Alfalfa was treated in 1956 with heptachlor and aldrin at the rates of ¼lb./acre and ⅛lb./acre, in order to study the disappearance of those insecticides under wisconsin conditions. Samples were collected immediately after treatment and 1, 3, 7, 14, and 21 days thereafter and were analyzed by specific chemical methods and by a direct feeding bioassay, using Drosophila melanogaster Meig. as a test insect. Seven days after treatment, both heptachlor and aldrin were recovered at a rate of 0.1 p.p.m., as tested by chemical analysis. However, when bioassays were conducted, the recoveries were slightly higher. In the case of aldrin, 7 days after treatment, 3.5 to 7.6 times more toxicant was recovered by bioassay as compared with results obtained by a specific chemical analysis. No heptachlor was found 2 weeks after treatment as tested by chemical and biological methods. No aldrin was found 3 weeks after treatment as tested by both methods.

This publication has 4 references indexed in Scilit: