Revolutionizing scandium detection in real samples: Unleashing the power of sol-gel-based optical sensor.

Autor: El-Bahy SM; Department of Chemistry, Turabah University College, Taif University, Taif, Saudi Arabia., Sari AAA; Department of Chemistry, University College in Al-Jamoum, Umm Al-Qura University, 21955, Makkah, Saudi Arabia., Amin AS; Chemistry Department, Faculty of Science, Benha University, Benha, Egypt. asamin2005@hotmail.com., Ali MA; School of Biotechnology, Badr University in Cairo (BUC), Badr City, Cairo, 11829, Egypt.
Jazyk: angličtina
Zdroj: Analytical sciences : the international journal of the Japan Society for Analytical Chemistry [Anal Sci] 2024 Aug; Vol. 40 (8), pp. 1509-1520. Date of Electronic Publication: 2024 May 15.
DOI: 10.1007/s44211-024-00589-5
Abstrakt: The development of a highly selective and ultra-sensitive optical sensor for detecting scandium (Sc 3+ ) ions involves incorporating the reagent 2,3-dichloro-6-(3-carboxy-2-hydroxy-1-naphthylazo)quinoxaline (DCHNAQ) into a silica sol-gel thin film on a glass substrate. This innovative approach utilizes tetraethoxy-silane (TEOS) as the precursor, maintaining a sol-gel pH level of 4.5, a water-to-alkoxide ratio of 5:1, and a DCHNAQ concentration of 5.0 × 10 -4  M. A detailed exploration of the impact of sol-gel parameters on the sensing capabilities of the developed sensor has been meticulously undertaken. This innovative sensor demonstrates remarkable selectivity in evaluating Sc 3+ ions over a dynamic range of 7.5-170 ng/mL, with limits of quantification and detection recorded at 7.3 and 2.20 ng/mL, respectively. Consistent results are achieved with a minimal RSD of 1.47 and 0.94% for Sc 3+ ions at 50 and 100 ng/mL, respectively, coupled with a swift response time of three min. Assessments of interference demonstrate a noteworthy preference for Sc 3+ ions, accomplished by enclosing DCHNAQ within the sol-gel framework and making optimal structural modifications to the doped sol-gel. The sensor offers straightforward regeneration using a 0.25 M EDTA solution, exhibiting complete reversibility. Comparative analysis with other methodologies underscores the efficacy in determining Sc 3+ ions in various reference materials, including plant leaves, fish, water, alloys, ores, and monazite samples.
(© 2024. The Author(s), under exclusive licence to The Japan Society for Analytical Chemistry.)
Databáze: MEDLINE
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