title: Determination of toxic heavy metals in sea water by FAAS after preconcentration with a novel chelating resin.
abstract: A solid phase extraction procedure was developed for preconcentration of toxic heavy metals such as cadmium, cobalt, copper, manganese, lead and zinc in sea water samples. A microcolumn packed with 6-[(4-hydroxyphenyl)diazenyl]naphthalene-2,3-diol-formaldehyde (HPDN-F) resin acts as a sorbent to retain the analyte ions by forming metal chelates. The retained trace level metal was subsequently eluted with 1 mol/L HCl and the acid eluent was analysed by Flame Atomic Absorption Spectrophotometer (FAAS). The HPDN-F chelating resin and its metal chelates were characterized by spectral and thermal analysis. The chelating property of the HPDN-F resin towards divalent metal ions was studied as a function of pH and preconcentration flow rate. The recoveries of cadmium, cobalt, copper, manganese, lead and zinc under the optimum working conditions were above 95%. The relative standard deviations were < 2%. The limits of detection were < 0.1 microg/L. The method presented was applied for the determination of cadmium, cobalt, copper, manganese, lead and zinc in sea water samples.
authors.affiliation: Ion Imprinting Solid Phase Extraction Lab, Department of Chemistry, National Institute of Technology, Tiruchirappalli 620015, India.
authors.forename: D
authors.initials: D
authors.lastname: Manivannan
authors.forename: V M
authors.initials: VM
authors.lastname: Biju
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D019216:Metals, Heavy / Q000032:analysis*; D012623:Seawater / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002614:Chelating Agents; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical