LXXXIX.—Estimation of furfuraldehyde

Abstract

By WILLIAM C'ORMACK. THE most reliable method for estimating this aldehyde is that of Flint and Tollens (Landw. Versuchs-Station, 1893, 42, 381), which is based on the production and gravimetric estimation of the phenylhydrazone. Their method, however, involves the use of a factor, which must be determined for the special conditions under which the estimation is carried out, as it varies with the concentration of the solution, amount of substance, &c. Further, since the phenylhydrazone cannot be heated above 60°, the time required to dry it to constant weight may amount to from one to three days, according t o the meana and apparatus available. The following method dispenses with the uee of a factor, and can be carried out in half an hour with a much

The Estimation of Pentoses and Pentosans

“…Silver Oxide-The^o xidation of furfural by ammoniacal silver oxide was used in a volumetric procedure by Cormack (1900), who titrated the excess silver by thiocyanate after filtration of the silver precipitate. Cormack's method has never been applied to the determination of pentoses.…”