Levels of gamma‐HCH have been determined in poultry tissue and eggs taken from poultry houses in which thermal vaporisers were operated. During continuous operation for 14 months, residue levels of gamma‐HCH in both substrates were related closely to changing levels of insecticide in the vaporiser; up to 46 mg kg−1 (on a fat basis) was found in tissue and up to 4.0 mg kg−1 (on a whole liquid basis) in eggs. Where the vaporisers were operated discontinuously, maximum levels were 6.7 mg kg−1 in tissue and 0.53 mg kg−1 in eggs.
Formulations of aldrin and dieldrin have been used for a number of years to treat exposed timber components used in the construction of freight containers. The extent to which these insecticides migrate to foodstuffs stored on or near treated plywood has been examined under laboratory conditions and is reported here. A limited survey of organochlorine insecticide residues in samples of foodstuffs, taken from commercial loads carried in freight containers, indicated that residue levels are unlikely to present a health hazard.
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