Arsenical nickel

Nickel Arsenate. Nickel arsenate [7784-48-7] Ni2(As0 2 8H20, is a yellowish green powder, density 4.98 g/cm. It is highly iasoluble ia water but is soluble ia acids, and decomposes on heating to form As20 and nickel oxide. Nickel arsenate is formed by the reaction of a water solution of arsenic anhydride and nickel carbonate. Nickel arsenate is a selective hydrogenation catalyst for iaedible fats and oils (59). 

Sodium, potassium, sulfur 0.10 Selenium, manganese, arsenic, nickel 2. X 10- ... 

Organic chemicals (alcohol, tars, dyes, solvents.. . ) Inorganic agents (metals - arsenic, nickel.. . ) Hormones... 

Insoluble starch xanthate (ISX) releases magnesium and takes up heavy metals. There are also a number of proprietary chemicals developed by various companies (e.g. Environmental Technology of Sanford, Florida) for removal of complexed copper, silver (from photographic process wastes), arsenic, nickel, lead, mercury, zinc, cadmium, barium, and other heavy metals. 

Lead, cadmium, mercury, PCBs, DDE, HCB, HCH, arsenic, nickel, creatinine, cotinine, nicotine, cortisol, epinephrine, norepinephrine, pentachlorophenol and other chlorophenols, metabolites of pyrethroids, PAHs, organic esters of phosphoric acid... 

Space will not be devoted here to emphasis of the vast technological importance of iron and the steels nor to the discussion of ferrous metallurgy. However, typical processes for obtaining cobalt and nickel from natural sources are outlined in Table 24-1. The process for cobalt is somewhat oversimplified, for cobalt ores often contain, in addition to iron and arsenic, nickel, silver, or copper, which must also be removed. Note that nickel is conveniently purified by conversion to its volatile carbonyl, Ni(CO)4, unstable at high temperatures Mond process). 

It is doubtful if these methods have ever been employed for manufacturing purposes. European arsenical cobalt ores have been worked for cobalt oxide by a process similar to that described later (see p. 86) for working up arsenical nickel ores. Moreover, a certain amount of cobalt oxide is also derived from the arsenical nickel ores, since these usually contain appreciable quantities of cobalt. 

Combined with arsenic, nickel occurs in the mineral niccolite, nickeline, ox copper nickel, NiAs. It is rarely crystalline, but when it is the form is hexagonal hardness 5-5 density 7-5. Its coppery rcdl hue is characteristic, only two other minerals, namely, copper arsenide and breihauptite or nickel antimonide, NiSb, bearing any resemblance to it. This latter mineral occurs at Andreasberg, in the Harz, is usually massive, and often associated with a considerable amount of lead sulphide. Crystals are rare hexagonal. 

Static leaching experiments were done in which the coal waste was shaken with deionized water for 1 to 50 days. The mixtures were then filtered and the filtrate was analyzed for acidity, specific conductance, and trace element content. All these measurements increased with leaching time. In many cases, the leachates were very acidic, with pH values less than 2, indicating that this waste could generate drainages of environmental concern. Iron, arsenic, nickel, manganese, and aluminium had concentrations in the waste effluents that are of... 

Figure 18. Wavelength-dispersive electron microprobe image of a cluster of pyrite framboids within coal from the Black Warrior basin Alabama. Bright colored areas show the presence of arsenic, nickel, and sulfur. Arsenic is concentrated in epigenetic overgrowths and cement surrounding the framboids, while the diagenetic framboid interiors them.selves contain little or no arsenic. This indicates that the arsenic was added after earliest diagenesis.

Pyrite and marcasite are the major minerals forming the sulfide cement, as identified by XRD and optical microscopy. These sulfides occur as both well-formed cubes and anhedral masses. Arsenic-rich areas (up to 1% by weight as estimated by EDS) occur in the pyrite and marcasite crystals as well as in iron hydroxides, but no separate arsenopyrite phase has been identified. Colloidal size (10-20 nm) iron hydroxide phases were identified using TEM. TEM-EDS analysis showed qualitative differences in arsenic, nickel, and zinc in the iron hydroxides on a nanometer scale. 

CAS 12068-85-8. FeSr Often mixed with small amounts of copper, arsenic, nickel, cobalt, gold, selenium. 

Efforts to discover whether other elements might be essential intensified during the 1970s. Although it is believed that arsenic, nickel, silicon, and boron are probably essential to humans, it has been difficult to determine whether other minerals have specific biological functions in humans or other animals. 

Microtox cannot identify individual containments and attention has to be drawn to the varying slopes of dose response curves. It is interesting to note that the slopes for arsenic, nickel, and thallium were all <1.0 in saline solution, whereas the slopes for mercury were >6.0. Unfortunately, these slopes would not be valid for any sample which contained m( e than one toxicant which could be the usual case in battlefield conditions. 

Thirteen atmospheric pollutants are named in Annex 1 of this directive. In the case of metals, lead had to be considered at an initial stage . Other metals, which are summarized as other air pollutants are cadmium, arsenic, nickel, and mercury. 

Martin Brinkman Bibhography on the occurrence, determination, and properties of the following metals in tobacco and tobacco smoke Arsenic, nickel, polonium, thorium, selenium, and others Martin Brinkman R D, Bremen, Germany (1973) 1-6. 

SIN/NAS] Singleton, M., Nash, P., The As-Ni (arsenic-nickel) system. Bull. Alloy Phase Diagrams, 8, (1997), 419-422. Cited on pages 210, 212. 

H. Lechtman, Architectural Cramps at Tiwanaku Copper-Arsenic-Nickel Bronze, inMetal-lurgica Antiqual in Honour of HanS Gert Bachmann and Robert Maddin, T. Rehren, A. Hauptmann, and J.D. Muhly (eds.), Deutches Bergbau-Museum Bochum, 1998, pp. 77-92. 

Nielsen, F.H. Evidence for the essentiality of arsenic, nickel, and vanadium and their possible nutritional significance. In "Advances in Nutritional Research", ed H.H. Draper, Plenum Publishing Corp., New York, NY, 1979, in press. 

N. Chen et al., XAFS Study of Arsenical Nickel Hydroxide, (Paper presented at the 15 International Conference on X-ray Absorption Fine Structure, Beijing, China, 22-28 July 2012)... 

In acid leaching, sulphuric acid is used in a complex ion-exchange or solvent extraction process to produce yellowcake of very high purity. Various metals (such as vanadium, arsenic, nickel, iron, copper, etc.) may be leached in this process. Chemicals involved in this process include sulphuric acid, ammonium nitrate, sodium chloride, amines, alcohols, kerosene, and ammonia. Considerable process water has to be derived from reclaim water of the tailings and returned to the mine for preparing the slurry. 

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