title: Removal of nuisance aqueous anions with Ferrilig.
abstract: The present study describes an improved synthesis of Ferrilig, an iron(III) salt of a commercially available immobilized ligand, IMLIG, called Octolig. The resulting composite, called "Ferrilig" was used to remove arsenate, chromate, molybdate, and selenite ions from aqueous solutions by means of column chromatography. The synthesis of Ferrilig was accomplished by treating an aqueous suspension of Octolig-21 with an equal weight of ferrous sulfate heptahydrate under nitrogen. The ferrous salt was then collected by sieving and allowed to oxidize to the iron (III) salt by exposure to air; treatment with dilute sodium hydroxide converted the composite to the hydroxide. Using 300 ppb As (as Na(2)HAsO(4).7H(2)O) and column chromatography, the arsenic concentration in the effluent was less than the detection limit (< 2 ppb). Chromium as sodium chromate, molybdenum as (NH(4))(6) Mo(7)O(24).4H(2)O, and selenium as Na(2)Se0(3), were removed with fair success. The elements, their initial concentrations and their percentage removal (parenthetically) were: As (280 ppb, 99%), Cr (50.6 ppm, 95.5%), Mo (50.7 ppm, 94.6%), Se (258 ppm, 99.9%).
authors.affiliation: Institute for Environmental Studies, Department of Chemistry, University of South Florida, Tampa, FL 33620-5250, USA. dmartin@cas.usf.edu
authors.forename: Dean F
authors.initials: DF
authors.lastname: Martin
authors.forename: Lauren F
authors.initials: LF
authors.lastname: O'Donnell
authors.forename: Barbara B
authors.initials: BB
authors.lastname: Martin
authors.forename: Robert L
authors.initials: RL
authors.lastname: Alldredge
mesh_terms: D000838:Anions / Q000737:chemistry / Q000302:isolation & purification*; D001151:Arsenic / Q000737:chemistry / Q000302:isolation & purification; D002857:Chromium / Q000737:chemistry / Q000302:isolation & purification; D005296:Ferrous Compounds / Q000737:chemistry; D008982:Molybdenum / Q000737:chemistry / Q000302:isolation & purification; D012972:Sodium Hydroxide / Q000737:chemistry; D018038:Sodium Selenite / Q000737:chemistry / Q000302:isolation & purification; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D000838:Anions; D005296:Ferrous Compounds; D014874:Water Pollutants, Chemical; D002857:Chromium; C044659:molybdate; C020748:ferrous sulfate; D012972:Sodium Hydroxide; D008982:Molybdenum; D018038:Sodium Selenite; D001151:Arsenic