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Molecular formula : CR
MW : 51.9961
CAS :
density : 7.22
Melting Point : 1857 ° C
Boiling Point : 2672 ° C
traits : steel gray metal.
dissolved : do not dissolve in water, dissolved in hydrochloric acid, sulfuric acid and perchloric acid, forming a blue two trivalent chromium ion, and releases hydrogen, the heating dissolved sulfate, dissolved in alkali solution.
purposes : with strong resistance to corrosion, oxidation was not easy. The system mainly used in stainless steel and other high temperature with corrosion-resistant metal alloys and chrome and cadmium seepage.
preparation or sources : the natural world into chromite mainly exist. Cadmium can be oxidized aluminum in the furnace were restored, or ammonium alum from chromium-containing little or chromic acid solution by electrolysis and prepared.
Note : atomic number 24, the main valence +2, +3, +6. Oxides dissociation (Do) : 4.2 (eV) elements of ionizing energy (Ei) : 6.76 (eV) and the main parameters of absorption lines : adding -------------------- -------------------- abroad abroad -- abroad -- abroad -- abroad -------------------- -------------------- abroad rural -- λ (nm) -- f -- W -- F -- S * CL -- R -- S -- East -------------------- -------------------- 250,000 250,000 -- 250,000 -- 250,000 -- 250,000 -- - 250,000 ------------------ things -- 357.9 -- -- 0.7 -- 0.34 N-A -- 0.10 -- -- 0.34 -- 357.9 -- 0.7 -- A-A -- 0.05 -- 0.008 -- 1.0 -- -- 350.4 0.7 0.27 -- -- A-A -- 0.15 -- 1.7 -- -- 360.5 0.7 0.19 -- -- A-A -- 0.2 2.2 -- -- 425.4 -- -- 0.10 -- 0.7 A-A -- -- 3.0 -- 427.5 -- 0.7 -- A-A -- -- 3 .8 429.0 -- -- 0.7 -- A-A -- -- 4.5 -- �-------------------- -------------------- Demonstration Demonstration Demonstration -- -- -- Demonstration Demonstration Demonstration -------------------- -------------------- reporter λ : wavelength f : oscillator strength W : monochromator spectrum passband A-A (air acetylene flame) N-A (nitrous oxide-acetylene flame) S * : Elements of the characteristics of concentration (1% absorption sensitivity) CL : Elements of the detection limit R S : The same elements of the main absorption lines between the relative sensitivity F : Flame types
categories : single quality
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