Speciation of inorganic arsenic and selenium in contaminated ground water samples collected from two areas (Alkermiah and Al-Sawani) in Tripoli-Libya

Speciation of inorganic arsenic and selenium in contaminated ground water samples collected from two areas (Alkermiah and Al-Sawani) in Tripoli-Libya

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Author(s)

Author(s): Abdunnaser Etorki, A. Elrgahii, M.El Rais

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641 1048 108-117 Volume 2 - Jan 2013

Abstract

This work deals with the assessment of the arsenic and selenium concentration levels in ground water in two districts of Tripoli, Libya. The study conducted from March 2009 to January 2010 and 14 samples of ground water were collected and analyzed every two months using inductively coupled plasma optical emission spectroscopy (ICP-OES). A novel absorbent was prepared by 1,3-dimercapto propane sulphonic acid chemically modifying mesoporous titanium dioxide nanoparticles and was employed as micro column packing material for simultaneous speciation of inorganic arsenic and selenium species. As and Se species could be adsorbed quantitatively on 1,3-dimercapto propane sulphuric acid modified TiO2 nanoparticles within a pH range of 3-7 and only As(III) could be quantitatively retained on the column within a pH of 10 while As(V) and Se(IV) were passed through the column without the retention. The results show that arsenic levels in ground water varied from 1.05 to 31.08 ng/ml with a mean value of 4.5 ±0.34, which is high than the recommended World Health Organization (WHO) guidelines of 10 ng/ml for drinking water in some ground water samples. The data generated in this study will provide base line values for monitoring arsenic concentrations in ground water in surveyed area.

Keywords

Speciation of arsenic, speciation of selenium, micro column packing, TiO2 nanoparticles, 1, 3-dimercapto propane sulphonic acid, ICP-OES

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International Journal of Sciences is Open Access Journal.
This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License.
Author(s) retain the copyrights of this article, though, publication rights are with Alkhaer Publications.

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