MEASURING METHOD FOR TOTAL ORGANIC CARBON, MEASURING METHOD FOR TOTAL NITROGEN AND MEASURING APPARATUS FOR THE METHODS

摘要

[PROBLEMS] To measure total organic carbon without influence of nitrogen components. [MEANS FOR SOLVING PROBLEMS] Total organic carbon is determined by (1) adjusting the hydrogen ion concentration of a sample water to pH 4 to 6, (2) decomposing the organic substances contained in the sample water into carbon dioxide through oxidation and decomposing the nitrogen compounds into nitrous acid through oxidation, (3) making the carbon dioxide permeate into water for measurement via a gas permeation section (5a), and (4) determining the electric conductivity of the resulting water.