Results are presented for the determination of organochlorine insecticide residues in imported cereals, nuts, pulses and animal foodstuffs for the 2 year period July 1969 to June 1971. BHC was found in all but four of the 248 samples examined but only in 25 (10%) did the level exceed 0.5 mg/kg. DDT was found in 39% of the samples of which three samples of wheat contained more than 1 mg/kg and two samples of cottonseed cake more than 0.5 mg/kg. The other commodities sampled had less than 0.2 mg/kg. DDE was detected in trace amounts in 26 % of the samples examined.
Results are presented for the determination of organochlorine insecticide residues in grain, pulses and nuts sampled on arrival in Britain during the 2+ years up to June 1969. BHC was detected in nearly every sample but the general level was low, most samples containing less than 0.1 ppm. DDT was found less frequently. Very few samples contained more than 1 pprn of either insecticide. DDE in trace amounts was found in about 10% of the samples of grain and nuts and TDE was found in one sample of grain. The only other organochlorine compounds detected were aldrin in one sample of pulses and hexachlorobenzene in 7 samples of wheat.
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.
Residue levels of organochlorine pesticides, organophosphorus pesticides, fumigants and bromide were determined in home‐produced and imported wheat during the period October 1978 to April 1979. A total of 281 samples was analysed of which 133 contained low levels of carbon tetrachloride, 112 contained low levels of gamma‐HCH and 26 contained low levels of malathion. One sample contained a residue of carbon tetrachloride, and another a residue of 1,2‐dichloroethane, both of which were above the Codex Alimentarius guide‐line levels. No other residue approached the proposed Codex Alimentarius maximum residue limits.
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.
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