P14 超音波を用いた微小液滴抽出法による超微量アルミニウムの定量(ポスター発表)

概要

論文の詳細を見る
In this study, a novel microextraction technique termed as ultrasound-assisted microextraction (UAME) has been proposed for preconcentration of aluminum from water samples at ultra trace levels prior fluorometric analysis. UAME is performed in two steps based on ultrasonic emulsification and ultrasound accelerated phase separation phenomena. Lower ultrasonic frequencies favor the emulsification of drop of organic solvent into aqueous solution, which leads to an increase in the mass transport process for the analyte and thus the extraction efficiency due to the higher specific area of dispersed w/o emulsion drop. At a higher frequency (2.4 MHz), however, the organic phase was separated completely again within several minutes. It is suggested that the radiation force in the ultrasound standing wave accelerated the aggregation of organic droplets in the high-frequency sonic field. UAME is thus can be taken place in a single closed vessel to avoid unnecessary risks of contamination. In the determination of trace aluminum(III), 500 μL of chloroform was used as extraction solvent with 8-hydroxyquinoline (8-HQ) as extractant. Parameters such as pH, ultrasonic irradiation time and frequencies were optimized. Under the optimum conditions, the target analyte was quantitatively extracted achieving the enrichment factor as higher as 39.9 (recovery around 100 %) for a 20.0 mL water sample, and the linear range, detection limit (S/N = 3), and the relative standard deviations (RSD) were 0-100 ng/mL, 0.3 ng/mL, and 2.6%, respectively. UAME has been successfully applied to the dissolution test of aluminum(III) from commercial aluminum foil.
2010-10-21

P14 超音波を用いた微小液滴抽出法による超微量アルミニウムの定量(ポスター発表)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク