title: An optimized procedure for preconcentration, determination and on-line recovery of palladium using highly selective diphenyldiketone-monothiosemicarbazone modified silica gel.
abstract: A novel, highly selective, efficient and reusable chelating resin, diphenyldiketone-monothiosemicarbazone modified silica gel, was prepared and applied for the on-line separation and preconcentration of Pd(II) ions in catalytic converter and spiked tap water samples. Several parameters like effect of pH, sample volume, flow rate, type of eluent, and influence of various ionic interferences, etc. were evaluated for effective adsorption of palladium at trace levels. The resin was found to be highly selective for Pd(II) ions in the pH range 4-5 with a very high sorption capacity of 0.73 mmol/g and preconcentration factor of 335. The present environment friendly procedure has also been applied for large-scale extraction by employing the use of newly designed reactor in which on-line separation and preconcentration of Pd can be carried out easily and efficiently in short duration of time.
authors.affiliation: Green Chemistry Network Centre, Department of Chemistry, University of Delhi, Delhi- 110007, India. rksharmagreenchem@hotmail.com
authors.forename: R K
authors.initials: RK
authors.lastname: Sharma
authors.forename: Amit
authors.initials: A
authors.lastname: Pandey
authors.forename: Shikha
authors.initials: S
authors.lastname: Gulati
authors.forename: Alok
authors.initials: A
authors.lastname: Adholeya
mesh_terms: D006863:Hydrogen-Ion Concentration; D007659:Ketones / Q000737:chemistry*; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D010165:Palladium / Q000032:analysis*; D058428:Silica Gel / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013882:Thiosemicarbazones / Q000737:chemistry*
chemical_list: D007659:Ketones; D013882:Thiosemicarbazones; D010165:Palladium; D058428:Silica Gel