VOLUMETRIC DETERMINATION OF SMALL AMOUNTS OF IRIDIUM

1950 ◽  
Vol 28b (12) ◽  
pp. 788-798 ◽  
Author(s):  
W. A. E. McBryde ◽  
M. L. Cluett
Keyword(s):  
Sulphuric Acid ◽  
Sulphate Solution ◽  
Platinum Metals ◽  
Considerable Advantage ◽  
Resultant Solution ◽  
Volumetric Determination

A volumetric procedure is described for determining small amounts of iridium (from 2 to 20 mgm.). A solution of the metal is heated to dense fumes with sulphuric acid, cooled, diluted with water, and then oxidized with an excess of cerium (IV) sulphate solution. The resultant solution is titrated with a standard 0.01 N iron (II) sulphate solution, the course of the titration being followed potentiometrically. In solutions containing other platinum metals it has been found possible to determine iridium directly in some cases by this procedure; in other cases it was found necessary to remove osmium as the volatile tetroxide prior to oxidizing with cerium (IV) sulphate. The method is probably less accurate than existing gravimetric procedures, but offers considerable advantage in simplicity.

The volumetric determination of nitrites by means of ceric sulphate solution

The Analyst ◽  
1935 ◽  
Vol 60 (715) ◽  
pp. 677 ◽  
Author(s):  
H. Bennett ◽  
H. F. Harwood
Keyword(s):  
Sulphate Solution ◽  
Volumetric Determination ◽  
Ceric Sulphate

A SPECTROPHOTOMETRIC DETERMINATION OF RHODIUM WITH TIN (II) BROMIDE

1958 ◽  
Vol 36 (8) ◽  
pp. 1151-1155 ◽  
Author(s):  
S. S. Berman ◽  
R. Ironside
Keyword(s):  
Sulphuric Acid ◽  
Spectrophotometric Determination ◽  
Hydrobromic Acid ◽  
The Other ◽  
Base Metals ◽  
Platinum Metals ◽  
Small Loss ◽  
Factors Influencing ◽  
Yellow Color

Rhodium salts react with a solution of tin (II) bromide in hydrobromic acid to produce an intense yellow color suitable for a spectrophotometric determination of rhodium. The method described is relatively simple and is the most sensitive for this metal published to date. Several factors influencing the intensity and stability of the colored species, whose nature is unknown, are described. Since the other platinum metals and base metals interfere it is necessary to isolate the rhodium prior to its determination. However, a fair estimation of rhodium can be made even when equivalent quantities of iridium are present. The procedure may be adapted, with a small loss in sensitivity, to determine rhodium in solutions which have been fumed with sulphuric acid.

scholarly journals Modelling and Multi-Objective Optimization of the Sulphur Dioxide Oxidation Process

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1072
Author(s):  
Mohammad Reza Zaker ◽  
Clémence Fauteux-Lefebvre ◽  
Jules Thibault
Keyword(s):  
Sulphuric Acid ◽  
Sulphur Dioxide ◽  
Variable Number ◽  
Inlet Temperature ◽  
Multi Objective Optimization ◽  
Absorption Column ◽  
Maximum Reaction Rate ◽  
Multi Objective ◽  
Maximum Reaction

Sulphuric acid (H2SO4) is one of the most produced chemicals in the world. The critical step of the sulphuric acid production is the oxidation of sulphur dioxide (SO2) to sulphur trioxide (SO3) which takes place in a multi catalytic bed reactor. In this study, a representative kinetic rate equation was rigorously selected to develop a mathematical model to perform the multi-objective optimization (MOO) of the reactor. The objectives of the MOO were the SO2 conversion, SO3 productivity, and catalyst weight, whereas the decisions variables were the inlet temperature and the length of each catalytic bed. MOO studies were performed for various design scenarios involving a variable number of catalytic beds and different reactor configurations. The MOO process was mainly comprised of two steps: (1) the determination of Pareto domain via the determination a large number of non-dominated solutions, and (2) the ranking of the Pareto-optimal solutions based on preferences of a decision maker. Results show that a reactor comprised of four catalytic beds with an intermediate absorption column provides higher SO2 conversion, marginally superior to four catalytic beds without an intermediate SO3 absorption column. Both scenarios are close to the ideal optimum, where the reactor temperature would be adjusted to always be at the maximum reaction rate. Results clearly highlight the compromise existing between conversion, productivity and catalyst weight.

Studies on the various conditions in the ordinary volumetric determination of calcium in limestone

1959 ◽  
Vol 8 (10) ◽  
pp. 656-660
Author(s):  
Shuichiro MIZOGUCHI ◽  
Kazuo KOIZUMI
Keyword(s):  
Volumetric Determination

Volumetric Determination of Uranium

1957 ◽  
Vol 29 (6) ◽  
pp. 954-957 ◽  
Author(s):  
J. S. Wahlberg ◽  
D. L. Skinner ◽  
L. F. Rader
Keyword(s):  
Volumetric Determination

scholarly journals Volumetric Determination of Potassium by Means of Sodium Cobaltinitrite

1942 ◽  
Vol 63 (10) ◽  
pp. 1414-1415
Author(s):  
Masayoshi ISHIBASHI ◽  
Kyo KAGI
Keyword(s):  
Volumetric Determination
Sign in / Sign up

Export Citation Format

Share Document