Abstract
1. One-tenth normal solutions of all of the chlorides tested (potassium, sodium, lithium, caesium, ammonium, calcium, manganese, ferric) decreased oxidation of pyrogallol by apple bark powder. 2. Oxidation was increased very slightly by 0.10 N solutions of all the sulphates tested. 3. Potassium, sodium, and magnesium nitrates (0 10 N) had practically no effect on oxidation, while nitrates of calcium, barium, manganese, and iron (ferric) decreased it. 4. Potassium chloride (0.02 N and 0 002 N) had no effect on oxidation, while manganese chloride in these concentrations increased it. 5. Tartrates, oxalates, citrates, acetates, and carbonates increased oxidation. Marked increase in oxidation in these cases seems to be due, in part at least, to the low acidity of the mixtures of bark, pyrogallol, and salt. 6. Marked decrease in oxidation is not necessarily accompanied by high acidity of the mixtures. 7. Ions other than the hydrogen and hydroxyl may be important in regulating oxidase activity. 8. In neutralizi...
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