Journal
APPLIED SPECTROSCOPY
Volume 71, Issue 2, Pages 288-299Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0003702816654166
Keywords
Solid phase extraction; gallium; indium; thallium; modified amino silica; flame atomic absorption spectrometry
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Amino silica gel functionalized with 2-hydroxy-5-(2-hydroxybenzylideneamino)benzoic acid was synthesized, characterized and used as adsorbent for the removal of Ga3+, In3+ and Tl3+ from aqueous solution prior to their determination by flame atomic absorption spectrometry. Experimental parameters that affect the separation process were investigated in both batch and column modes. The maximum adsorption capacities of the sorbent are 61.7mg g(-1), 81.3mg g(-1) and 133.0mg g(-1) for Ga3+, In3+ and Tl3+, respectively. The preconcentration factor is 200 and the limits of detection of Ga3+, In3+ and Tl3+ are 4.10gL(-1), 1.55gL(-1) and 1.21gL(-1), respectively. Interference by Al3+ can be masked by the addition of F-; and that of Fe3+ by its reduction to Fe2+ using 10% ascorbic acid. The method was successfully applied for the determination of these ions in water, sediments and liquid crystal display samples.
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