二酸化炭素電極を検出部とした水中の全有機炭素測定装置

概要

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An appratus for measuring the concentration of total orgnic carbon in water with a Pco_2 electrode as a sensor was constructed and its feasibility was studied. The oxygen carrier gas (approximately 300ml/min) is used instead of air, because nitrogen in air is converted into NO_z which intterferes with the Pco_2 mesurement. The sample combustion chamber is maintaned at 800℃, whereas the oxidation chamber is operated at 600℃. Two ml of aqueous sample is injected onto a platinum boat in the combustion chamber with a roller pump and evaporated gradually. Carbon-aceous materials are oxidized to carbon dioxide with a Pt-Rh catalyst on alumina. Water vapor is removed at room temperature by a cooling trap, and the carbon dioxide is absorbed in 2ml of O.5 M NaOH solution. The solution is acidified with 1ml of 2 M HCl and introduced into a cell, where the potential of a Pco_2 electrode is measured. The content of total organic carbon in the sample was calculated from a calibration curve obtained with the atandard solution in the same mamer. The time required for an analysis about 8 mim, and the predsion is about ±20%.
社団法人日本分析化学会の論文
1975-06-10