title: The role of some compounds on extraction of chromium(VI) by amine extractants.
abstract: The extraction of hexavalent chromium, Cr(VI), from hydrochloric acid aqueous solution using Aliquat 336 and Alamine 336 extractants was performed under different experimental conditions. The data clarify that one molecule of amine extractants shares with approximately one molecule of HCl to extract two molecules of Cr(VI) from 1M HCl aqueous solutions. The extraction is an exothermic process and possesses enthalpy change values of -41.02 and -28.08 kJ mol(-1) for the extraction by Aliquat 336 and Alamine 336, respectively. The presence of potassium chloride greatly increases the extraction of Cr(VI) by amine extractants while the addition of some phenolic compounds such as phenol, dichlorophenol, o-nitrophenol and beta-naphthol decreases this extraction under the same experimental conditions.
authors.affiliation: Nuclear Chemistry Department, Hot Laboratory Centre, Atomic Energy Authority, P.O. 13759, Cairo, Egypt.
authors.forename: H H
authors.initials: HH
authors.lastname: Someda
authors.forename: E A
authors.initials: EA
authors.lastname: El-Shazly
authors.forename: R R
authors.initials: RR
authors.lastname: Sheha
mesh_terms: D000588:Amines / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D006851:Hydrochloric Acid / Q000737:chemistry; D007220:Industrial Waste / Q000517:prevention & control*; D009994:Osmolar Concentration; D019800:Phenol / Q000737:chemistry; D011189:Potassium Chloride / Q000737:chemistry; D012996:Solutions; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000588:Amines; D007220:Industrial Waste; D012996:Solutions; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D019800:Phenol; D011189:Potassium Chloride; D006851:Hydrochloric Acid