Some of the factors, including choice of absorbent, indicator and titrant, that affect the determination of carbon dioxide by non-aqueous titrimetry are examined experimentally. The results of this examination are used to give a procedure that is recommended for the determination of milligram amounts of carbon dioxide.The method involves absorption of the carbon dioxide in a 5 per cent. v/v solution of ethanolamine in formdimethylamide, followed by titration with standard tetrabutyl ammonium hydroxide in benzenemethanol solution t o a visual end-point with thymolphthalein indicator.
EXPERIMENTAL ABSORPTION AND RETENTION OF CARBON DIOXIDE-The reactions of a number of amines with carbon dioxide were examined by passing the gas sequentially into undiluted samples of diethylamine, diamino-ethane, butylamine, benzylamine, cyclohexylamine and ethanolamine.
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