Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.11889/7685
Title: Synthesis, characterization and application of a novel mercapto- and amine-bifunctionalized silica for speciation/sorption of inorganic arsenic prior to inductively coupled plasma mass spectrometric determination
Authors: Boyaci, Ezel 
C¸agır, Ali 
Shahwan, Talal 
Eroǧlu, Ahmet E. 
Keywords: Arsenic - Environmental aspects.;Mercapto-functionalized silica;Arsenic speciation;Amine-functionalized silica;Bifunctional silica;Inductively coupled plasma mass spectrometry;Speciation
Issue Date: 2011
Publisher: Talanta
Abstract: A bifunctional sorbent, (NH2 + SH)silica, containing both amine and mercapto functional ities was prepared by modification of silica gel with 3-(triethoxysilyl)propylamine and (3-mercaptopropyl)trimethoxysilane. In addition to the bifunctional sorbent, silica gel was modi fied individually with the functional mercapto- and amino-silanes, and the mono-functional sorbents, namely (SH)silica and (NH2)silica, were also mechanically mixed ((NH2)silica + (SH)silica) for the sake of comparison of sorption performances. It has been demonstrated that (SH)silica shows quantitative sorption only to As(III) at two pH values, 1.0 and 9.0, while (NH2)silica displays selectivity only towards As(V) at pH 3.0. On the other hand, the bifunctional (NH2 + SH)silica possesses the efficient features of the two mono-functionalized sorbents; for example, it retains As(III) at a wider pH range, from 1.0 to at least 9.0 with the exception at pH 2.0, and it also shows quantitative sorption to As(V) at pH 3.0. This property gives the bifunctional (NH2 + SH)silica a better flexibility in terms of sorption performance as a function of solution pH. The mechanically mixed (NH2)silica + (SH)silica exhibits a similar but less efficient sorption behavior compared to the bifunctional sorbent. Desorption of both As(III) and As(V) species can be realized using 0.5 M NaOH. The validity of the proposed method was checked through the analysis of a standard reference material and a good correlation was obtained between the certified (26.67 g L−1) and determined (27.53 ± 0.37 g L−1) values. Spike recovery tests realized with ultrapure water (93.0 ± 2.3%) and drinking water (86.9 ± 1.2%) also confirmed the applicability of the method.
URI: http://hdl.handle.net/20.500.11889/7685
DOI: 10.1016/j.talanta.2011.06.021
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