Journal
MICROCHIMICA ACTA
Volume 175, Issue 3-4, Pages 225-231Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-011-0667-3
Keywords
4-aminophenylarsonic acid modified nano-TiO2/SiO2 composite material; Preconcentration; Aluminum (III); ICP-OES
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Funding
- Chinese Ministry of Education [208155]
- QingHai Science and Technology Department (China) [2010-Z-716]
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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%.
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