Preconcentration of Cu(II) Using Isonitrosoacetophenone Anthranoylhydrazone Modified Silica Gel

Abstract

In this study, highly selective and efficient adsorbent, isonitrosoacetophenone anthranoylhydrazone modified silica gel, was prepared and applied for separation and preconcentration of Cu 2+ ion in water samples. Cu 2+ ion and other metal ions were determined by Inductively Coupled Plazma Optical Emission Spectrometry. The influences of analytical parameters including pH, amount of adsorbent, sample volume, eluent volume, type of eluent etc. on the quantitative recovery of Cu 2+ were investigated. The effects of some alkaline, alkaline earth, some metal ions and anions on the recoveries of Cu 2+ were also examined. Optimum pH value for the adsorption of Cu 2+ was pH 5. 2 mL of 0.5 M H 2 SO 4 solution for Cu 2+ was found to be satisfactory for the quantitative elution. Limit of detection and limit of quantitation was calculated as 0.265 μg L -1 and 0.803 μg L -1 for Cu 2+ respectively. It was observed that adsorption behaviour of Cu 2+ ions was fitted to the Langmiur adsorption isotherm better than the Freundlich isotherm. In order to validate the accuracy of the method for determination of Cu 2+ ion, certified reference material (ground water-BCR 610) was used. The determined values were in good agreement with the certified values. Proposed separation and preconcentration method was applied to spring, tap and sea water samples. The recoveries of Cu 2+ added to water samples were in between 82-93%.