动力学分析法测定气相中的二氧化碳

Determination of Carbon Dioxide in Gaseous Phase by Kinetic Analysis

本文基于气相中的二氧化碳在稀氢氧化钠-酚酞溶液中的溶解而使酚酞逐渐褪色的动力学行为提出了一种直接测定气相中微量二氧化碳的动力学分析法。研究表明,该反应的速率与气相中CO_2的浓度成正比。利用固定浓度法,本文测定了一些模拟样品和环境气体样品,效果良好。该方法仪器简单,样品不必预处理。

A kinetic method for the direct determination of CO_2 in gaseous phase is proposed, based on fading the phenolphthalein when CO_2 dissolves in dilute aqueous solution of NaOH. It was found that the rate of color-fading reaction was proportional to the concentration of CO_2 in gaseous phase. Some synthetic samples and ambient air samples were determined by using fixed concentration method with satisfactory results.