Abstract

Ali Moghimi^1* and Mohamad Javad Poursharifi²

A new simple and reliable method for rapid and selective extraction and determination of trace levels of Ni 2+ ion is developed. Ni ions are adsorbed quantitatively during passage of aqueous samples through nano polyacrylonitrile fiber modified. Almost all matrix elements were found to pass through the nano polyacrylonitrile fiber to drain. The retained Ni 2+ ions are then stripped from the nano polyacrylonitrile fiber with a minimal amount of thiosulfate solution as eluent and subsequently measured by atomic absorption spectrometry.  Modified nano polyacrylonitrile fiber (PANF) was prepared by adding of acrylic fibers to methanolamine (MMA) with different concentration solutions. The stability of a chemically modified nano polyacrylonitrile fiber especially in concentrated hydrochloric acid which was then used as a recycling and pre-concentration reagent for further uses of  Modified nano polyacrylonitrile fiber. The application of this  Modified nano polyacrylonitrile fiber for sorption of a series of metal ions was performed by using different controlling factors such as the pH of metal ion solution and the equilibration shaking time by the static technique. Ni(II) was found to exhibit the highest affinity towards extraction by these  Modified nano polyacrylonitrile fiber phases. The pronounced selectivity was also confirmed from the determined distribution coefficient (Kd) of all the metal ions, showing the highest value reported for Ni(II) to occur by  Modified nano polyacrylonitrile fiber. The potential applications of  Modified nano polyacrylonitrile fiber for selective extraction of Ni(II) to occur from aqueous solution were successfully accomplished as well as pre- concentration of low concentration of Ni(II) (60 pg ml-1) from natural tap water with a pre-concentration factor of 100 for Ni(II) off-line analysis by flame atomic absorption analysis.

Preconcentration; Ni(II); Modified nano polyacrylonitrile fiber

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