Chrom

Aqueous ammonia can also behave as a weak base giving hydroxide ions in solution. However, addition of aqueous ammonia to a solution of a cation which normally forms an insoluble hydroxide may not always precipitate the latter, because (a) the ammonia may form a complex ammine with the cation and (b) because the concentration of hydroxide ions available in aqueous ammonia may be insufficient to exceed the solubility product of the cation hydroxide. Effects (a) and (b) may operate simultaneously. The hydroxyl ion concentration of aqueous ammonia can be further reduced by the addition of ammonium chloride hence this mixture can be used to precipitate the hydroxides of, for example, aluminium and chrom-ium(III) but not nickel(II) or cobalt(II). 

By the reaction of chlorine with a heated mixture of chrom ium(III) oxide and carbon ... 

Chiral-AGP, Application Note NO 1, Chrom Tech AB, Norsburg, Sweden, 1988. 

L. H. Goodson and W. B. Jacobs, deal Time Monitor, Immobilfed Enzyme Alarm and Spare Parts, Edgewood Arsenal Report No. ED-CR-77015, Eeb. 1977. J. P. Mieure and M. W. Dietrich,/ Chrom. Sci. 13, 559 (Nov. 1973). 

Gmelin Handbuch derMnorgansischen Chemie, System-Nr. 52, Chrom (Chromium) Part A, 1, 1962, 438 pp. Part A, 2, 1963, 330 pp. Vedag Chemie. 

Pyrazolines Imidazoles Thiazoles Oxadiazoles 1 -Phenylpyrazoles Purines Dioxolanes Ox azolines 10% Cyanethylated mannite on Celite 545. 5% OV-17 on Chromosorb W, AW-DMCS (H.P.). Carbowax 4000, dioleate on firebrick, 190 °C. Silicone grease on Chromosorb P. Apiezon L on firebrick C-22, 220 °C. 15% Hallcomid M-18 on firebrick. Carbowax 20M on Gas-Chrom P. Ethyleneglycol succinate on Diatoport-S. 

Various highly crosslinked polymers, with slightly different properties, such as Envi-Chrom P, Lichrolut EN, Isolute ENV or HYSphere-1, have been applied in environmental analysis, mainly for polar compounds. For phenol, for instance, which is a polar compound, the recoveries (%) when 100 ml of sample was analysed were 5, 16 and 6 for PLRP-s, Envi-Chrom P and Lichrolut EN, respectively (70). 

Chrom, n. chromium chrome, -alauii, m. chrome alum. 

Chrom bad( n. chrome bath. beizet /. chrome mordant. 

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