On fermentation / by P. Schützenberger.

  • Schützenberger, P. (Paul), 1829-1897.
Date:
1883
Catalogue details

Licence: Public Domain Mark

Credit: On fermentation / by P. Schützenberger. Source: Wellcome Collection.

    120/388 (page 108)
    by an oxymetrical process which I hâve invented, with the assistance of M. C. Risler, one of my pupils. As this method seems to me likely to be serviceable in i-esearches of this kind, and in the study of biological phenomena, I think I ought to give the description of it here, even at the risk of introducing a foreign élément into the examination of the facts which now occupy our attention. Process for the Volumétrie Estimation of Dissolvcd Oxygen.—The process of measurement of the quantity of oxygen dissolved in water, by means of a standard liquid, which was proposed by M. Gérardin and myself, (Comp. Rend., vol. 75, p. 879), and which I hâve since improved, with the assistance of M. C. Risler, dépends essentially on the energetic reducing properties of sodium hyposulphite. This sait* is obtained with the greatest facility by the action of a solution of sodium bisulphite on zinc, either in plates, shavings, or powder. Its formation is much more rapid when the zinc em- ployed is fînely divided, and the points of contact between the métal and the solution of bisulphite are more numerous. Thus, with powdered zinc employed in sufficient quantity, and a very concentrated solution of bisulphite (marking 35° Beauné, and requiring from 5 to 7 per cent, of its weight of powdered zinc), an agitation of from three to five minutes is sufficient to complété the reaction. This takes place, with élévation of température, according to the following équation (SO. NaO. HO) + ZN» = s. N.1O. HO + SO (NaO)’ + SO (Zn O)’ + m O. bodiura bisulphite. Sodium hyposulphite. Sodium sulphite. Zinc sulphite. Water. • P. Schutzenberger on a new acid of sulphur, Ann. de Cliim. et de Phj’S., vol. 20, p. 251 (4).