Nickel chromate

Nickel catalysts, 77 94, 99, 109 precipitated, 77 121-122 Nickel-catalyzed dinitrotoluene hydrogenation, 25 194 Nickel chelates, 77 117 Nickel chloride hexahydrate, 77 109, 110 Nickel chromate, molecular formula, properties, and uses, 6 562t Nickel-chromium alloy 600, in galvanic series, 7 805t... 

Ligands are named first, starting with any anionic ones, and the name of the metal is followed without a space by the oxidation state in Roman numerals (or the Arabic 0, for zero-valent metal centers) in parentheses. If the complex as a whole is anionic, the metal name is made to end in -ate, which replaces endings such as -ium or -um (nickelate, chromate, tantalate) and is followed by the oxidation state. Where the chemical symbol is derived from a Latin name, the anion name is usually also Latinized cuprate, argentate, aurate, ferrate, stannate, plumbate—but mercurate is an exception. 

Cobalt Chromate, CoCr04, is prepared by heating cobalt carbonate and chromic acid solution for several hours at 185° C. in a sealed tube.5 It yields greyish black crystals, readily soluble in hot dilute nitric acid (contrast nickel chromate). The dihydrate, CoCr04.2H20, is obtained by the interaction of cobaltic acetate and potassium chromate. It yields bronze-coloured prisms or leaflets.5... 

Neutral solutions of nickel salts produce with potassium chromate a chocolate-brown precipitate of hydrated basic nickel chromate, NiO.NiCr04.Aq. It forms only slowly in the cold, even from concentrated solutions. Boiling hastens the precipitation. The reaction may be utilised in detecting small quantities of nickel.9... 

Nickel Chromate, NiCrO is obtained by maintaining a solution of nickel carbonate and chromic acid at 260° C. in a sealed tube for... 

Double Chromates.—Several double chromates containing nickel have been prepared. Amongst these are potassium nickel chromate,3 K2Cr04.NiCr04.6H20, and the corresponding ammonium, rubidium, and ccesium salts. Basic chromates have also been described.4... 

NICKEL CHROMATE see NDAIOO NICKEL CHROMITE see NDAIOO NICKEL CHROMUM OXIDE see NDAIOO NICKEL, COMPOUND mth pi-CYCLOPENTADIENYL (1 2) see NDA500... 

Cobalt chloride is a potent sensitizer in the guinea pig (Wahlberg and Boman 1985). Animals induced with cobalt chloride do not react to nickel, chromate, or rhodium at cross challenge testing (Liden et al. 1995). Cobalt chloride for patch testing is commercially available (Chemotechnique Diagnostics 1998 Hermal 1997). 

It can be seen from Table 6 that when 174 patients (157 male, 17 female) with cutting-oil dermatitis were investigated (Grattan et al. 1989), many positives were found on the standard series that were relevant. Metals such as nickel, chromate and cobalt are liberated into the cutting fluids from the metal being machined. Although levels found are lower than one would normally expect for sensitisation to occur, the fact that 9.6% of males in the series were nickel... 

Heavy metals used in glazes or enamels cobalt, nickel, chromate, red iron oxide, antimony trioxide, manganese dioxide, red copper oxide, cadmium chloride, vanadium pentoxide. 

Occupational contact sensitization to different metal salts, including nickel, chromate, cobalt, gold, palladium and mercury/amalgam, has been found (Kanerva et al. 1993c Richter 1996 Rustemeyer and Frosch 1996 Cleenewerck 1997). However, in our experience, non-occupational sources of sensitization dominate, particularly for nickel, cobalt and mercury salts. 

In numerous cases, known as reciprocal solutions, the solid solution can be considered to be the product of two pairs of pure compounds, which are called the poles. Thus, the solution between iron sesquioxide (Fc304) and nickel chromate (NiCr204) 5delds spinel (Fe, Ni )i (Cr, Fe )i. However, this solution could also give rise to the following pure compounds iron chromate (FeCr204) and nickel ferrite (NiFe04). We say that the possible poles of spinel are either the iron sesquioxide-nickel chromate pair or the iron chromate-nickel ferrite pair. 

Kokelj, E, Daris, E, Lutmann, A., and Braida, N. (1994). Nickel, chromate and cobalt in toilet soaps analysed by inductively coupled plasma mass spectrometry. Contact Dermatitis 31(4), 270. 

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