Optical Sensor for the Determination of Pb2+ Based On Immobilization of Dithizone onto Chitosan-Silica Membrane

https://doi.org/10.22146/ijc.23560

Yuspian Nur(1), Eti Rohaeti(2*), Latifah Kosim Darusman(3)

(1) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University, Darmaga Campus, Kimia Building, Tanjung Street, Bogor 16680
(2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University, Darmaga Campus, Kimia Building, Tanjung Street, Bogor 16680
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University, Darmaga Campus, Kimia Building, Tanjung Street, Bogor 16680 Biopharmaca Research Center, Institute of Research and Community Empowerment, Bogor Agricultural University, Taman Kencana Campus-Bogor
(*) Corresponding Author

Abstract


Optical sensor based on immobilization of dithizone onto chitosan-silica for the determination of Pb2+ has been prepared. The sensor was made of the composite membrane of chitosan and silica in the ratio of volume 2:1. Sol-gel technique has been chosen to prepare the membrane. The fabricated sensor indicated a good selectivity at pH 5 with response time at ± 180 s. Linearity response was obtained with concentration ranged from 0.2 to 1.1 ppm with r2 = 0.9921. The percentage of relative standard deviation (%RSD) on precision and accuracy as recovery percentage (% recovery) were 1.46 and 100.96%, respectively. Limit of detection (LOD) and limit of quantitation (LOQ) were 0.11 and 0.37 ppm, respectively.

Keywords


optical sensor; chitosan-silica composite; dithizone; lead(II) metal

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DOI: https://doi.org/10.22146/ijc.23560

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