Determination by the radioactive indicator method of the retention and stability of thiabendazole in treated Valencia oranges

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Thiabendazole residues were determined by the radioactive indicator method in peel and pulp of oranges which had been dipped in a 0.1% aqueous suspension of the fungicidal agent thiabendazole, and then stored for periods up to four weeks. Whole peel from these oranges retained an average of ≃46 μg of thiabendazole/g after four weeks of storage. Inner peel contained only 8–21% of these levels, suggesting a slow inward diffusion of drug. The edible portion was virtually free of thiabendazole. Practically all of the applied agent was still present as intact thiabendazole after four weeks of storage.