BURY AND PARTINQTON : PREPARATION AND CCXXXIX.-Preparation and Reactions of Stannous Oxide and Stannous Hydroxides." By FRANK WARD BURY and JAMES RIDDICK PARTINGTON. DITTE (Ann. Chirn. Phy$., 1882, [v], 27, 145) prepared stannous hydroxide by adding sodium or potassium hydroxide to a solution of stannous chloride, the precipitate being washed by decantation and dried in a vacuum at 14". He obtained a brownish-yellow, amorphous powder to which he assigned the formula Sn0,2H20. On heating this powder at 110", Ditte obtained small, brown scales which could be readily powdered. To this substance he assigned the formula 3Sn0,ZqO. Ditte does not mention the methods used in analysing the substances. Schaffner (Anmlen, 1844, 51, 168) prepared a specimen of stannous hydroxide by the addition of potassium carbonate to stannous chloride solution. He dried the precipitate below 80". The amount of water in the compound was estimated by heating it to dull redness in a bulb tube in a stream of carbon dioxide, and assuming the loss in weight to be water and the residue stannous oxide. No estimation of the percentage of tin present in the compound was made. Schaffner assigned to this compound the formula BSnO,H,O. He described the precipitate produoed by * " Stannous hydroxide " throughout this paper means a hydrated form of stasnous oxide obtained by any method described, and not neceeearily the definite compound Sn(OH),; perhaps a more suitable name would be " hydrated stannous oxide " or " st(LMous oxide hydrate."
L'article présente une méthode de préconcentration de traces d'éleménts lourds (Zn, Hg, Cr, Cd, Cu) dans les eaux en vue de leur dosage par activation neutronique. Le choix s'est porté sur la résine complexante Dowex Al. Les rendements de fixation ont été déterminés pour les éléments cités. L'influence du pH et de la force ionique a été étudiée et les conditions optima de fixation ont été établies. Cette étude montre que la résine Dowex A1 s'avère satisfaisante.
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