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Abstract
1. Urinary excretion of thiocyanate by hens after dosage with cyanide was studied over 3 hr periods during which various sulphur sources were infused. 2. With 20 μmoles cyanide, endogenous sulphur supplies appeared to be almost sufficient. 3. With 45 μmotes cyanide, thiocyanate excretion was doubled with 90 μmoles of sulphur donor. Higher doses of mercaptopyruvate were also effective but not rhodanese substrates (thiosulphate or methanethio-sulphonate): they interfered with thiocyanate excretion and may also have suppressed its formation. 4. Mercaptopyruvate and rhodanese substrates also differed in their effects on blood cyanide concentration and on the excretion of isotope from radiolabelled cyanide.
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