title: Solid phase extraction of chromium(VI) from aqueous solutions by adsorption of its diphenylcarbazide complex on an Amberlite XAD-4 resin column.
abstract: A method has been developed for the solid phase extraction of chromium(VI) based on the adsorption of its diphenylcarbazide complex on an Amberlite XAD-4 resin column. The influence of acidity, stability of the column, sample volume, flow rate and interfering ions were studied in detail. The adsorbed complex could be eluted using acetone-sulfuric acid mixture and the concentration of chromium was determined using visible spectrophotometry. A detection limit of 6 microg L(-1) could be achieved. A preconcentration factor of 27 could be obtained for 400 mL sample volume. The validity of the method was checked in spiked water samples and electroplating wastewater.
authors.affiliation: Chemistry Group, Birla Institute of Technology and Science, Pilani, Rajasthan 333031, India. rajesh@bits-pilani.ac.in
authors.forename: N
authors.initials: N
authors.lastname: Rajesh
authors.forename: Rohit Kumar
authors.initials: RK
authors.lastname: Jalan
authors.forename: Pinky
authors.initials: P
authors.lastname: Hotwany
mesh_terms: D000327:Adsorption; D002857:Chromium / Q000737:chemistry*; D004160:Diphenylcarbazide / Q000737:chemistry*; D004595:Electroplating; D007220:Industrial Waste; D011137:Polystyrenes / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D052616:Solid Phase Extraction; D012996:Solutions; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D011137:Polystyrenes; D011145:Polyvinyls; D012996:Solutions; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D004160:Diphenylcarbazide; C012101:XAD-4 resin