title: Separation and determination of metallocyanide complexes of Fe(II), Ni(II) and Co(III) by ion-interaction chromatography with membrane suppressed conductivity detection applied to analysis of oil refinery streams (sour water).
abstract: A separation and determination method for the analysis of cyanometallic complexes of Fe(II), Ni(II) and Co(III) was developed to be applied to the analysis of petroleum refinery streams (sour water). Ion-interaction chromatography was used employing an analytical column IonPac NS1 10 microm and a chromatographic system ICS 2500 equipped with a membrane conductivity suppression ASRS ultra 4mm, both supplied by Dionex Corporation. The mobile phase was composed of 2 mmol l(-1) TBAOH, 1 mmol l(-1) Na(2)CO(3), 0.1 mol l(-1) NaCN and ACN (77:23, v/v), flowing at 0.7 ml min(-1). At the optimized conditions, detection limits estimated by the calibration curve parameters and relative standard deviation were: 0.002 mg CNl(-1) and 3.1% for Fe(CN)(6)(4-); 0.003 mg CNl(-1) and 2.5% for Ni(CN)(4)(2-) and 0.003 mg CNl(-1) and 2.8% for Co(CN)(6)(3-). Sour water samples without any pretreatment (except membrane filtration) from a petroleum refinery in Brazil were analyzed successfully by external calibration method.
authors.affiliation: Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói/RJ 24020-150, Brazil.
authors.forename: Renata
authors.initials: R
authors.lastname: Souza e Silva
authors.forename: Maria de Fátima Batista
authors.initials: Mde F
authors.lastname: de Carvalho
authors.forename: Ricardo Erthal
authors.initials: RE
authors.lastname: Santelli
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D003035:Cobalt / Q000032:analysis / Q000302:isolation & purification*; D003486:Cyanides / Q000032:analysis / Q000302:isolation & purification*; D005296:Ferrous Compounds / Q000032:analysis / Q000302:isolation & purification*; D007220:Industrial Waste / Q000032:analysis*; D009532:Nickel / Q000032:analysis / Q000302:isolation & purification*; D010578:Petroleum; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D003486:Cyanides; D005296:Ferrous Compounds; D007220:Industrial Waste; D010578:Petroleum; D014874:Water Pollutants, Chemical; D003035:Cobalt; D009532:Nickel