Lindane residues on pasture and in the fat of sheep grazing pasture treated with lindane prills

Effect of four insecticides on the pasture ecosystem

“…Even after 30 weeks, and 225 mm rain in the first month, very little of the chemicals penetrated more than 30 mm into the soil. This poor penetration is, however, consistent with past experience of surface application of insecticides to pasture (Chisholm & Koblitsky 1961;Collett & Harrison 1968;Gallaher & Evans 1961;Harris & Sans 1969).…”

“…Most insecticides applied to the pasture surface remain in the top 30-50 mm (Chisholm & Koblitsky 1952;Collett & Harrison 1968;Gallaher & Evans 1961;Harris & Sans 1969). Insecticides may be mixed into the soil during cultivation or sowing.…”

Failure of ethanol and phenobarbitone to reduce organochlorine pesticide residues in sheep

“…The extract was transferred to a graduated centri· fuge tube and the extraction repeated twice. The extracts were "cleaned up" by shaking with con· centrated H2S04 and washing with saturated Na2S04, according to the method of Collett & Harrison (1968). Suitable aliquots were subjected to gas liquid chromatography.…”

DDT and lindane: new aspects of stock residues derived from a farm environment

“…Operating conditions were similar to those described by Collett and Harrison (1968). Methods of sub-sampling fats, pastures, and wils and the subsequent steps involving solvent extraction and clean-up were essentially those described by Collett and Harrison (1968) for fat and pasture and by Solly, Harrison, and Shanks (1968) for soils. The following recoveries were obtained from fortified control samples analysed by these methods, the figures being the means of from 7 to 14 recovery checks over the course of a year: For most analyses a 5% Dow 11 column was used.…”