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A method using high performance liquid chromatography with an ammonium acetate-buffered acetonitrile/water mobile phase has been developed for the analysis for heroin. The method gives good resolution of the opiates found in illicit heroin.

Experimental sprayings of kiwifruit vines with azinphos-methyl, diazinon, and omethoatc were carried out in 1973 and with azinphos-methyl in 1974. Repeated azinphos-methyl <::pplications gave virtually scale-free leaves and fruit at loarvest. Residues of azinphos-methyl [Illd omethoate were unusually high immediately after spraying (up to 18 mg/kg and 11 mg/kg respectively) and residues from some treatments remained above the relevant New Zealand maximum residue limits (MRL) (2 and 0.5 mg/kg) for in excess of 5 weeks. Diazinon residues were lower and decayed to below the New Zealand MRL within 10 days. The fUrface hair on the fruit contributed significantly to the high azinphos-methyl residues.

Strawberries from several areas in New Zealand were analysed for mevinphos ('Phosdrin') residues, after spraying by commercial growers. Residues detected were up to 4.2 rug/kg. These residues decayed with half lives of 2-4 days, and all samples had residues below the New Zealand tolerance (1.0 rug/kg) within 6 days of spraying.

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