Gold arsenate

Kuroda and Tarui [498] developed a spectrophotometric method for molybdenum based on the fact that MoVI catalyses the reduction of ferric iron by divalent tin ions. The plot of initial reaction rate constant versus molybdenum concentration is rectilinear in the range 0.01-0.3 mg/1 molybdenum. Several elements interfere, namely, titanium, rhenium, palladium, platinum, gold, arsenic, selenium, and tellurium. 

This deposit is located in the north-east of Russia and belongs to a gold-arsenic type of low-sulphide formation (Abramson et al, 1980). It lies within a carbonaceous terrigenous rock of Triassic age and is associated with a dome-shaped uplift in a node of intersecting faults of various directions. The ore bodies consist of zones of silicification and kaolinization with veinlet-disseminated sulphide mineralisation. Gold is present in the form of finely-dispersed dissemination in arsenopyrite and pyrite. As an example. Figure 1 illustrates the distribution of Au and Mn in connection with commercial ore... 

Gold Arsenate is precipitated as a yellowish-white powder when sodium orthoarsenate is added to a hot solution of auric chloride.12... 

Ghana Southwest aerobic soils on weathered gold-arsenic Weathered ores — 86.2—557 (0.45 pm filtered, mostly As(V)) Bowell, Morley and Din (1994)... 

Faure, K. and Brathwaite, R.L. (2006) Mineralogical and stable isotope studies of gold-arsenic mineralisation in the Sams Creek peralkaline porphyritic granite, South Island, New Zealand. Mineralium Deposita, 40(8), 802-27. 

Lestinen, P., Kontas, E., Niskavaara, H. and Virtasalo, J. (1991) Till geochemistry of gold, arsenic and antimony in the Seinajoki district, western Finland. Journal of Geochemical Exploration, 39(3), 343-61. 

Before 1914, the US imported most metallic arsenic from Germany (e.g., Smith, 1945). From 1914 to about 1930, the bulk of the arsenic production in the US (marketed for commercial applications as As203, arsenic trioxide, or white arsenic) was derived as a metallurgical by-product of the smelting of copper, lead, and gold. Arsenic trioxide was used in the production of fertilizers, herbicides, and insecticides (Kirk-Othmer, 1992 Ullman s Encyclopedia, 1998), or if transformed to arsenic acid, used in the manufacture of CCA, a preservative of wood products (Mineral Commodity Summaries, 2004). Arsenic metal is also used for solders, ammunition, anti-friction additive to bearings, and in the computer and electronics industry for semiconductors (Mineral Commodity Summaries, 2004). 

ASAU3O4 (s) AU3ASO4 (s) Gold Arsenate ASAU3O4 (s) AU3ASO4 (s)... 

Figure 2-33 shows the results along a profile sampled at intervals of 5-20 m across known sulphide mineralisation in quartz veins in late Palaeozoic igneous rocks covered by 60 m of Quaternary sediments. Conventional geochemical survey data fail to detect the mineralisation (Fig. 2-33A). The MPF results, on the other hand, give well-defined anomalies for gold, arsenic, silver and copper (Fig. 2-33B).

Clinical use The major uses of penicillamine are in the treatment of copper poisoning and of Wilson s disease. It is sometimes used as adjunctive therapy in gold, arsenic, and lead intoxication and in rheumatoid arthritis. The agent is water-soluble, well absorbed from the gastrointestinal tract, and excreted unchanged. 

The first chemolithotrophic culture was isolated in the former Soviet Union by Ilyaletdinov and Abdrashitova (18). The organism, named Pseudomonas arse-nitoxidans by them, was associated with a gold-arsenic deposit (sulfidic gold ore). The culture consisted of aerobic, gram-negative, motile, straight rods (0.4 X 1.2-... 

In wastewater treatments, special attention is given to removal of dangerous inorganic material such as the heavy metals, including mercury, chromium, molyMenum, cobalt, nickel, copper, cadmium, lead, uranium, gold, arsenic, barium, iron and vanadium. Whereas the forces of adsorption from the gas phase are well understood, adsorption from solution of inorganic species is not so well understood. So, it is most pertinent to enquire about the sites which are responsible for adsorption of inorganic species. 

Kings Gold Arsenic Trisulfide Lead Tetraacetate... 

It can be seen from Table I that the contents of gold, arsenic and sulfur in the sulfur and arsenic-bearing gold ore account for 47.02 g/t, 19.32% and 27.30%, respectively. These show... 

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