Abstract
A simple photoelectric arrangement is described for analysing the colour of the streaming fluid in various parts of the observation tube of a Hartridge-Roughton apparatus. The method has been applied especially to the colour changes of indicators, with the aid of which rapid H changes may be followed. Under favourable conditions an accuracy of 0-01-0.02 p H is reached, the distribution of the indicator between its two coloured forms being determinable to within about ± 1.0%.
Highlights
The need for an optical method of analysis of the moving fluid in a Hartridge-Roughton rapid reaction apparatus which shall be economical of fluid, non-subjective, and applicable to a wide range of colour changes, has been met by the application of photoelectric cells
A simple photoelectric arrangement is described for analysing the colour of the streaming fluid in various parts of the observation tube of a Hartridge-Roughton apparatus
The validity of the method for rapid reaction studies is supported by the reasonable agreement between values, as given by it, for the velocity constants of the reactions (i) H 2C 0 3-> COa + H aO; (ii) C 0 2 + OH' -> H C 0 3', with the values of these constants as given by other methods
Summary
The need for an optical method of analysis of the moving fluid in a Hartridge-Roughton rapid reaction apparatus which shall be economical of fluid, non-subjective, and applicable to a wide range of colour changes, has been met by the application of photoelectric cells. Fluid economy has been improved 10- to 100-fold, and the range of measurable reactions greatly extended as regards colour, without any loss in time range. II—A Simple Apparatus for Rapid p Hand Other Changes, Requiring 200 cc or More of Each Reagent
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