Cadmium ammonium sulphate

The haze which can be seen in fair weather is mainly due to submicron ammonium sulphate particles. This aerosol also contains soot, agglomerates of very small carbon particles with adsorbed high molecular weight organic compounds and appreciable amounts of certain trace elements, e.g. lead, zinc, iron, nickel, cadmium etc. 

Over the years, copper metal production stopped for economic reasons, but numerous other products were added for environmental reasons and to maximize economic return from the concentrates treated. In many cases, technical innovation played a significant role in developing the required processes. The list of products sold today includes zinc, lead, silver, gold, indium, germanium, bismuth, cadmium, calomeL sulphuric acid, liquid sulphur dioxide, ammonium sulphate f tilizers, coppa sulphate, coiqier arsenate, sodium antimonate and ferrous granules. 

Aluminium sulphate Ammonium bifluoride Ammonium bisulphite Ammonium bromide Ammonium persulphate Antimony trichloride Beryllium chloride Cadmium chloride Calcium hypochlorite Copper nitrate Copper sulphate Cupric chloride Cuprous chloride Ferric chloride Ferric nitrate... 

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... 

H. M. Dawson and J. McCrae, D. P. Konowaloff, and W. Gaus also used soln. of various salts of the alkali metals, and of potassium, sodium, cupric, or barium hydroxide in place of water and also copper sulphate, copper chloride, zinc sulphate, and cadmium iodide while M. 8. Sherrill and D. E. Russ examined the effect of ammonium chromate. W. Herz and A. Kurzer examined the distribution of ammonia between water and a mixture of amyl alcohol and chloroform. Observations on the distribution of ammonia between water and chloroform were made by T. S. Moore and T. F. Winmill, G. A. Abbott and W. C. Bray, and J. M. Bell. J. H. Hildebrand gave for the molar fraction N X104 of ammonia at 1 atm. press., and 25°, dissolved by ethyl alcohol, 2300 methyl alcohol, 2730 and water, 3300. 

Although more widely applicable to organic chemicals, the matrix of some inorganic chemicals may be reduced or modified by heating to an elevated temperature. Care must be exercised not to lose volatile trace metals such as arsenic, cadmium and zinc mercury will almost invariably be lost to some extent. Matrices which might be amenable to this treatment include ammonium salts, sulphates, nitrates and the salts of organic acids such as the oxalates. 

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