Selective lanthanum ions optical sensor based on covalent immobilization of 4-hydroxysalophen on a hydrolyzed triacetylcellulose membrane |
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Authors: | A A Ensafi E Fooladgar |
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Institution: | 1.Department of Chemistry,Isfahan University of Technology,Isfahan,Iran |
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Abstract: | An optical sensor membrane is described for the determination of lanthanum(III) ions based on the immobilization of 4-hydroxysalophen
on a hydrolyzed triacetylcellulose membrane. 4-Hydroxysalophen is covalently bonded to a transparent hydrolyzed triacetylcellulose
film. The sensing membrane in contact with lanthanum ions at pH 4.0 changes color from white-yellow to orange (323 to 433
nm). Under the optimum conditions, the proposed membrane displayed a linear range from 1.0 × 10−6 to 1.0 × 10−2 M La(III) with a limit of detection of 1 × 10−7 M. The response time of the membrane was within 5–6 min depending on the concentration of La(III) ions. The selectivity of
the probe towards lanthanum ions was found to be excellent. The sensor was successfully applied to the determination of La(III)
in water, industrial waste water, and in NIST-615 (glass matrix) and NIST-3127a (lanthanum solution) samples with satisfactory
results. |
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Keywords: | |
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