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1949
SPRAY PROCESSING
673
This rate of air flow was less than a quarter of that which would have been required to supply Ives and Kunz injector grids, judging from the data (for a different shape tank) given in their paper.3 Thus, when considering the oxidation rates given below, it should be borne in mind that the air flow was comparatively low and higher rates might be met with in practice.
Experimental Conditions
The object of these experiments was to find the initial rates of oxidation of the Elon and hydroquinone from the unexhausted developer. In a continuously replenished system, the Elon and hydroquinone are maintained at a steady concentration, and the rates of
HYOROQUINONE
WITH COLLOIDAL A«
TIME (HOURS)
-i
Fig. 5 — Change of composition of D76d aerated in the S-R Spray system. The run with colloidal silver may be regarded as a duplicate since no marked effect could be traced to its use.
oxidation are reflected in the extra quantities of the developing agents needed in the replenisher. Because of the repeated and extended runs that would have been required to establish the correct replenishment rate in each case, the simpler course was followed of installing a fresh bath and measuring the initial rates of oxidation.
In all the runs on all five systems and in the small-scale oxidation experiments to be described later, the temperature was maintained 20 degrees, within =±=V2 degree centigrade. No account was taken of the barometric pressure because the accuracy to be expected in work of this nature was not sufficiently high to merit doing so.
The Elon and hydroquinone analyses were carried out along the lines described elsewhere.5 Sulfite analyses were done using Stott's method.6 The pH values were determined using an ordinary glass