0 Average of six determinations. 6 The amount of calcium and sodium salts converted to that of free acid.The electrode potentials of the 2-iodoxy-/2-iodosobenzoate system at 25°are 1.33, 0.61 and 0.56 V at pH 1, 4 and 7 respectively. At the corresponding pH, the 2-iodoso-/2iodobenzoate system has electrode potentials 1.21, 0.53 and 0.48 V.Large amounts of glucose, maltose, sucrose, lactose, sodium formate, glycine, and alanine do not interfere with the determination of isoniazid; other materials that do not affect the analysis appear in the footnote of Table II.LITERATURE CITED(1) Garratt, D. C. "The Quantitative Analysis of Drugs"; Chapman & Hall:
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