TL;DRAbstract
An ordered mesoporous silica coated capillary prepared by sol-gel technique was dynamically modified with 8-hydroxyquinoline (8-Ox) for the fractionation of aluminum by capillary microextraction (CME). It was found that non-labile nomomeric Al (Al-citrate) and labile nomomeric (free Al) could be efficiently separated by 8-Ox modified ordered mesoporous silica coated capillary at the pH range of 5.0-8.0. Based on this fact, a new technique of CME on-line coupled with ICP-MS has been proposed for the analysis of different Al species in environmental waters. Under the optimal conditions, the detection limit for Al was 0.34 ng• mL^(-1) and the preconcentration factor was 10 fold. The method has been applied to the fractionation of Al in lake water, pool water and Yangtze River water, and the results were in good agreement with that obtained by the 8-Ox loaded silylanization silica gel microcolumn system.
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An ordered mesoporous silica coated capillary prepared by sol-gel technique was dynamically modified with 8-hydroxyquinoline (8-Ox) for the fractionation of aluminum by capillary microextraction (CME). It was found that non-labile nomomeric Al (Al-citrate) and labile nomomeric (free Al) could be efficiently separated by 8-Ox modified ordered mesoporous silica coated capillary at the pH range of 5.0-8.0. Based on this fact, a new technique of CME on-line coupled with ICP-MS has been proposed for the analysis of different Al species in environmental waters. Under the optimal conditions, the detection limit for Al was 0.34 ng• mL^(-1) and the preconcentration factor was 10 fold. The method has been applied to the fractionation of Al in lake water, pool water and Yangtze River water, and the results were in good agreement with that obtained by the 8-Ox loaded silylanization silica gel microcolumn system.
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