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| An Al3+ sensor based on the membrane of acetyl cellulose containing nano -Al2O3 crystals was studied. In the buffer solution of 0.5 mol/L CH3COOH - CH3COONa（pH=5.0), the sensor responds to Al3+ in a linear range from 1.00 ×10-5 to 1.00×10-2 mol/L. A near-Nernstian response was obtained and the regression equation was E (mv) = -161.4 -26.54 lg[Al3+] with a detection limit of 7.90×10-6 mol/L. More than 14 different ions as the considered interferences were tested and the relevant selectivity coefficients were determined using the separate solution method (SSM). The sensor possesses many advantages including short conditioning time, fast response, and, especially, very good selectivity over a wide variety of other co-existing ions. The sample analysis on the aluminium migration amount from aluminium utensils to the solution was determined by this sensor. The analytical results were agreed with that of inductively coupled plasma-atomic emission spectroscopy (ICP-AES). |
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| Keywords: sensor, aluminum (Ⅲ), acetyl cellulose membrane, nano -Al2O3 |
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