Abstract
The suitability of V2O5 and Co3O4 deposited on porous silica as the combustion aids for flash combustion of organic chlorine compounds has been studied. The chlorine recovery as a function of sweep-out time with a stream of dry or moist oxygen was determined. Quantitative removal of chlorine from a tube inca. 10 min can be achieved only with a stream of moist oxygen. Combustion in a stream of moist oxygen in the presence of Co3O4 precludes final gravimetric determination of chlorine by binding it on metallic silver, because the capacity of the silver for reaction with chlorine in the form of HCl rapidly decreases, falling to about 30% of the initial value after only 5 determinations. Iodogravimetric determination of the chlorine yields correct results and allows simultaneous determination of carbon, for samples up to 45 mg.
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