“…Lebedeva and Nikolaeva (181) reported on the efficiencies of Russian brands of carbon blacks for the conversion O CO. Steyermark (297) submitted the gravimetric procedure (CO to C02 over heated CuO and collection and weighing of the carbon dioxide in an absorption tube) to collaborative study which gave satisfactory results. Recommended specifications for a microchemical apparatus for oxygen in organic compounds based on the water gas reaction and suitable for both gravimetric and volumetric procedures have been published (299).…”