Cadmium sulphate

Beryllium compounds with the exception of aluminium beryllium silicates Cadmium oxide Cadmium sulphate... 

For some non-ferrous metals (copper, lead, nickel) the attack by sulphuric acid is probably direct with the formation of sulphates. Lead sulphate is barely soluble and gives good protection. Nickel and copper sulphates are deliquescent but are gradually converted (if not leached away) into insoluble basic sulphates, e.g. Cu Cu(OH)2)3SO4, and the metals are thus protected after a period of active corrosion. For zinc and cadmium the sulphur acids probably act by dissolution of the protective basic carbonate film. This reforms, consuming metal in the process, redissolves, and so on. Zinc and cadmium sulphates are formed in polluted winter conditions whereas in the purer atmospheres of the summer the corrosion products include considerable amounts of oxide and basic carbonate. ... 

Cadmium-ion solution. Dissolve about 6.0 g of analytical grade crystallised cadmium sulphate in 25 mL of Reagent I. 

A typical conventional polarogram for 0.003 M-cadmium sulphate in 1M potassium chloride in the presence of 0.001 per cent gelatin, and the corresponding derivative curve, are shown in Fig. 16.7 (/max is the maximum current recorded in the derivative mode). 

Pipette lOmL of a cadmium sulphate solution (1.0gCd2+ L-1) into a 100 mL graduated flask, add 2,5 mL of 0.2 per cent gelatin solution, 50 mL of 2 M potassium chloride solution and dilute to the mark. The resulting solution (A) will contain 0.100gCd2+ L-1 in a base solution (supporting electrolyte) of 1 M potassium chloride with 0.005 per cent gelatin solution as suppressor. 

Standard cadmium ion solution. Prepare a standard cadmium ion solution containing ca 0.04 mg mL 1 Cd using hydrated cadmium sulphate. 

Cadmium liquid amalgam 412 Cadmium sulphate, thermal analysis 498 Calcein (fluorescein iminodiacetic acid) ... 

Cadmium chalcogenide thin hlms have been grown by ECALE using cadmium sulphate as metal source and sodium sulphide, sodium selenite,... 

Solbe, J.F.D.L.G. and V.A. Flook. 1975. Studies on the toxicity of zinc sulphate and of cadmium sulphate to stone loach Noemacheilus barbatulus (L.) in hard water. Jour. Fish Biol. 7 631-637. 

The main advantage of Weston s cell was its insensitivity to temperature, and the emf of almost 1 V to be precise, 1.0183 V at 20 °C. It is usually constructed in an Id-shaped glass vessel. One arm contains a cadmium amalgam electrode beneath a paste of hydrated cadmium sulphate (3CdS04 5H20) cadmium sulphate and mercury sulphate. The other arm contains elemental mercury. Its schematic is Cd(Hg) CdS04(aq), Hg2S04 Hg. 

DSA-02 oxide-coated Ti anode (DSA = Dimensionally Stable Anode) is placed, thus creating a large cathode volume. The effluent solution flows perpendicularly through the electrodes with a typical flow rate of 0.5 dm3 s-1. The flowthrough metal electrodes have an active area approximately 15 times their geometric area. The cell allows air sparging to increase the mass-transfer. The current efficiency is about 40% when the inlet concentration of the metal ions is 150 to 1500 ppm and the concentration at the out-let is about 50 ppm. The cell is currently used for the treatment of recirculated wash-waters from acid copper, copper cyanide, zinc cyanide, zinc chloride, cadmium sulphate, cadmium cyanide and precious metal plating and washwaters from electroless copper deposition. Since the foam metal electrodes are relatively expensive the electrodes... 

The starting material for making these pigments is cadmium sulphate, which must be free from iron, nickel and copper impurities. Cadmium sulphide is precipitated from the sulphate solution by adding an alkaline solution of pure sodium sulphide under controlled conditions of pH, temperature and addition rate. The yellow product is in the cubic crystal form, which is converted into the required hexagonal form by calcination at 500-600 °C in the absence of air. 

Haddow A, Roe FJC, Dukes CE, Mitchley BCV Cadmium neoplasia Sarcomata at the site of injection of cadmium sulphate in rats and mice. BrJ Cancer 18 667-673, 1964... 

Cadmium sulphate also forms ammino-derivatives a diammino-, a tetrammino-, and a hexammino-derivative are known. 

Diammino-cadmium Sulphate, [Cd(NH3)2]S04, is formed by heating hexammino-cadmium sulphate to 100° C. The compound is stable at 100° C. and no ammonia is liberated. 

Tetrammino-cadmium Sulphate, [Cd(NH3)4 S04.2lI20, is prepared by evaporation of an aqueous ammoniaeal solution of cadmium sulphate, or by passing ammonia gas into a well-cooled ammoniaeal solution of the sulphate. A hydrate containing four molecules of water may be obtained, when an aqueous ammoniaeal solution of cadmium sulphate is poured into alcohol and the ammonia allowed to evaporate in air. The hexammine is prepared by the method already described for hexammino-sdne chloride. It loses ammonia when fused and completely decomposes water hydrolyses it with precipitation of cadmium hydroxide. 

Zinc Sulphate, Zinc Nitrate—Derivatives of Cadmium. Halides, Cadmium Sulphate, Cadmium Nitrate—Derivatives of Merouric Halides-—Amnrino-mercurio Salts, Ammonolysed Compounds, Millon s Base. 

Preparation of Crystalline Cadmium Sulphide. Dissolve 3 g of cadmium sulphate in 80 ml of water, add 20 ml of a 1 N sulphuric acid solution to the reaction vessel, and pass a stream of hydrogen sulphide through it up to complete precipitation of cadmium sulphide. Filter off the cadmium sulphide precipitate, wash it several times with water saturated with hydrogen sulphide, remove it from the filter, and dry it in a drying... 

Preparation of Autocomplex Cadmium Iodide. Pour 20 ml of a 10% cadmium sulphate solution... 

Cadmium sulphate [10124-36-4] M 769.5. Crystd from distd water by partial evapn in a desiccator. 

Cadmium Polyvanadates.—Two are known, 2Cd0.3V20s.15H20 and Cd0.3Vs08.2HgO. The former is obtained by the action of cadmium sulphate on the corresponding barium salt,1 and the latter by the action of cadmium nitrate on ammonium metavanadate in the presence of acetic acid.2... 

Cadmium Arsenates.—The hydrated normal cadmium orthoarsenate, 2Cd3(As04)2.3H20, falls as a white voluminous precipitate on adding alkali to a solution of cadmium mono- or di-hydrogen arsenate in hydrochloric acid,4 or on addition of sodium orthoarsenate to a solution of cadmium sulphate.5 On drying at 100° C. the anhydrous salt remains. 

Firm transparent jellies are produced 11 when solutions of potassium dihydrogen arsenate and cadmium sulphate, of suitable concentrations, are mixed. They are unstable and crystallise into 2Cd,(AsO,)<>. 4CdHAs04.9Ha0. 

A reliable modification of the process for the estimation of methoxyl is that of the British Pharmacopoeia, 1932. The apparatus is shown in Fig. 80. A Pyrex flask (A) of about 100 c.cs. capacity, having a bulb (B) of about 70 c.cs. capacity blown on the side tube, contains the mixture of substance (about 0-2 gm.) and hydriodic acid (10 c.cs.). The side tube is connected through a smaller bulbed tube (0) to a set of bulbs (D, see Fig. 65), immersed in a water bath at 60° (95° for ethoxyl), containing red phosphorus suspended in a 2% aqueous solution of cadmium sulphate. To this is attached two absorption flasks (E), each containing about 20 c.cs. of the above alcoholic silver nitrate. To the flask (A) is... 

Evaluation.—5 gms. sodium sulphide are dissolved in water up to 250 c.cs. and carefully neutralised with dilute acetic acid in presence of phenolphthalein until the latter is colourless. A N solution of crystallised zinc sulphate (57-514 gms. ZnSO TB O per litre) is run in from a burette until all the soluble sodium sulphide is converted into zinc sulphide. A cone, solution of cadmium sulphate is spotted on thick blotting-paper, and a drop of the liquid being analysed is placed near it. A yellow stain will be produced as long as any soluble sulphide remains. The zinc sulphate is added until no yellow colour is given. 

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