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Preconcentration of trace aluminum (III) ion using a nanometer-sized TiO2-silica composite modified with 4-aminophenylarsonic acid, and its determination by ICP-OES |
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| Authors: | Hong Zheng Xiuzhen Gao Lin Song Haiyan Guo Shuling Yang Xijun Chang |
| Institution: | 1. College of Chemistry and Chemical Engineering, SouthWest University, Chongqing, 400715, Peoples Republic of China 2. Department of Chemistry, Qinghai Normal University, Xining, 810008, China 3. Department of Chemistry, Lanzhou University, Lanzhou, 730000, Peoples Republic of China |
| Abstract: | We describe a nanometer sized composite material made from titanium dioxide and silica that was chemically modified with 4-aminophenylarsonic acid and used for selective solid-phase extraction, separation and preconcentration of of aluminum(III) prior to its determination by ICP-OES. Under optimized conditions, the static adsorption capacity is 56.58?mg?g?1, the enrichment factor is 150, the relative standard deviation is 1.6% (for n?=?11), and the detection limit (3?s) is 60?pg?mL?1. The method was validated by analyzing the reference materials GBW 09101 (hair) and GBW 10024 (scallop) and successfully applied to the determination of trace Al(III) in spiked water samples and human urine, with recoveries ranging from 96% to 101%. 4-aminophenylarsonic acid modified nanometer TiO2/SiO2 composite material has been developed to separate and concentrate trace Al(III) from aqueous samples. Parameters that affect the sorption and elution efficiency were studied in column mode, and the new adsorbent presents high selectivity and adsorption capacity for the solid phase extraction of trace Al(III). |
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