METHOD OF DETERMINING IODINE IN IODINE-CONTAINING ORGANICS

摘要

FIELD: analytical methods. SUBSTANCE: weighed amount of substance under examination is wetted with potassium carbonate solution and calcined to ashes, which are mixed with water and resulting suspension is supplemented by nitric acid and methanol and placed into electrochemical cell. Iodide ions are precipitated there onto mercury electrode surface at positive electrode potential. Volt-ohmmetric dependence is measured by changing mercury electrode potential toward its zero value and iodine amount is judged of from volt-ohmmetric dependence. Such procedure allows determining iodine concentrations from a few tens of mcg to several tens of mg per 1 kg of organic material. EFFECT: widened determination range and reduced operation cost. 8 cl, 4 dwg