Autoclave Dissolution of Platinum Metals in Hydrochloric Acid Oxidizing Media

2021 ◽  
Vol 62 (6) ◽  
pp. 668-674
Author(s):  
N. V. Belousova ◽  
O. V. Belousov ◽  
R. V. Borisov ◽  
A. A. Akimenko
Keyword(s):  
Hydrochloric Acid ◽  
Platinum Metals

THE SEPARATION OF SMALL AMOUNTS OF THE PLATINUM METALS: 1. THE COLORIMETRIC DETERMINATION OF RHODIUM AND ITS SEPARATION FROM IRIDIUM

1961 ◽  
Vol 39 (12) ◽  
pp. 2389-2393 ◽  
Author(s):  
D. E. Ryan
Keyword(s):  
Hydrochloric Acid ◽  
Stannous Chloride ◽  
Colorimetric Determination ◽  
Acid Solutions ◽  
Platinum Metals ◽  
Hydrochloric Acid Solutions ◽  
Product Separation ◽  
Chromous Chloride ◽  
Made In

A method for separating small amounts of rhodium from iridium is described. In 3 to 9 M hydrochloric acid solutions, the amber-to-red complex of bivalent rhodium with 4,5-dimethyl-2-mercaptothiazole is formed after reduction of tervalent rhodium with chromous or stannous chloride. Rhodium is quantitatively separated from iridium by chloroform extraction of this product; separation can be made in solutions that have been fumed with sulphuric acid if chromous chloride is used for the prior reduction of the rhodium. The complex, after removal of the chloroform, is dissolved in dilute hydrochloric acid, and the optical density of the resulting colored solution is measured.

SEPARATIONS OF THE PLATINUM METALS BY ION EXCHANGE

1958 ◽  
Vol 36 (5) ◽  
pp. 835-844 ◽  
Author(s):  
S. S. Berman ◽  
W. A. E. McBryde
Keyword(s):  
Hydrochloric Acid ◽  
Ion Exchange ◽  
Anion Exchanger ◽  
Complete Recovery ◽  
Distribution Coefficients ◽  
Acid Solutions ◽  
Platinum Metals ◽  
Hydrochloric Acid Solutions

Distribution coefficients for the chlorides of ruthenium, rhodium, palladium, iridium(III and IV), and platinum have been determined between the anion exchanger Amberlite IRA-400 and hydrochloric acid solutions of various molarities. Separations of various combinations of rhodium, iridium, palladium, and platinum in amounts of 0.5 mg. or less are described. When, in the course of these separations, the four metals are present together, special procedures are required to ensure complete recovery of platinum.

ORGANIC REAGENTS FOR PLATINUM METALS: I. THE DETERMINATION OF PALLADIUM WITH 1,10-PHENANTHROLINE

1949 ◽  
Vol 27b (2) ◽  
pp. 67-71 ◽  
Author(s):  
D. E. Ryan ◽  
P. Fainer
Keyword(s):  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Volumetric Method ◽  
Hydrochloric Acid Concentration ◽  
Platinum Metals ◽  
Chloride Solutions ◽  
Organic Reagents

Palladium may be precipitated quantitatively with 1,10-phenanthroline from palladous chloride solutions; variations in the hydrochloric acid concentration from 1 to 20% had no effect on the precipitation. The reagent yields no precipitates with other platinum metals under similar conditions; slightly high results, however, were obtained when palladium was precipitated from solutions containing these metals. The precipitate has the composition C12H8N2PdCl2 and may be used as a weighing form for palladium. A micro-volumetric method for palladium using 1,10-phenanthroline is described. Small amounts of platinum (as Pt+4) do not interfere.

Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

1974 ◽  
Vol 32 ◽  
pp. 58-59
Author(s):  
W. H. Zucker ◽  
R. G. Mason
Keyword(s):  
Fine Structure ◽  
Platelet Aggregation ◽  
Hydrochloric Acid ◽  
Whole Blood ◽  
Platelet Adhesion ◽  
Hemostatic Agent ◽  
Native Collagen ◽  
Fibrillar Morphology ◽  
Clinical Interest ◽  
New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

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