title: Extraction and transport of chromium(VI) through a bulk liquid membrane containing triphenylphosphine.
abstract: The solvent extraction of chromium(VI) in chloroform, dichloromethane, dichloroethane and its transport through a chloroformic bulk liquid membrane from sulphuric acid solutions with the neutral extractant triphenylphosphine (TPP) were studied. It was highlighted that the TPP extractant is an interesting complexing and efficient carrier for transport of chromium(VI) as [(HTPP)HCr2O7] complex from a 2M sulphuric acid solutions. It has a high ability to concentrate the chromium(VI) in the receiving phase according to the Donnan equilibrium. The co-extraction and the co-transport of sulphuric acid is very low and has no effect on the transport efficiency. The transport rate depends mainly on the initial concentration of the extractant.
authors.affiliation: Laboratoire de recherche sur l'Eau, Université Mouloud Mammeri, 15000 Tizi-Ouzou, Algérie. asahm@caramail.com
authors.forename: Amar
authors.initials: A
authors.lastname: Sahmoune
authors.forename: Lynda
authors.initials: L
authors.lastname: Mitiche
mesh_terms: D001692:Biological Transport; D002725:Chloroform / Q000737:chemistry; D002857:Chromium / Q000302:isolation & purification*; D005025:Ethylene Dichlorides / Q000737:chemistry; D005374:Filtration / Q000379:methods; D008566:Membranes; D008752:Methylene Chloride / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000737:chemistry*; D010720:Phosphines / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D005025:Ethylene Dichlorides; D009943:Organophosphorus Compounds; D010720:Phosphines; D013464:Sulfuric Acids; D002857:Chromium; C074702:chromium hexavalent ion; C061896:triphenylphosphine; C024565:ethylene dichloride; D008752:Methylene Chloride; D002725:Chloroform; C044646:phosphine; C033158:sulfuric acid