Journal
RSC ADVANCES
Volume 12, Issue 29, Pages 18431-18440Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra03129a
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- Department of Chemistry, Faculty of Science, Benha University
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A sensitive, selective, and reversible optical sensor for cobalt(ii) ions was developed. The sensor demonstrated a good linear range and low detection limit, and showed excellent selectivity and stability in environmental samples with complicated matrices.
A novel sensitive, selective, and reversible cobalt(ii) ion optical sensor was prepared by the incorporation of 5-[o-carboxyphenylazo]2,4-dihydroxybenzoic acid [CPDB] and sodium tetraphenylborate (NaTPB) in a plasticized polyvinyl chloride (PVC) membrane containing dioctyl adipate (DOA) as a plasticizer. The influence of several parameters such as pH, base matrix, solvent mediator and reagent concentration was optimized. A comparison of the obtained results with those of previously reported sensors revealed that the proposed method, in addition to being fast and simple, provided a good linear range (0.05-45.20 mu M) and low detection limit (0.015 mu M). Low detection and quantification limits and excellent selectivity in the presence of interfering ions such as Fe3+, Cu2+, Ni2+, Ag+, Au3+, Cr3+, Cd2+, Zn2+, Hg2+, and SO42- make it feasible to monitor Co2+ ion content accurately and repeatedly in environmental samples with complicated matrices. The optode was regenerated successfully using 0.3 M nitric acid (HNO3) solution while its response was reversible with a relative standard deviation (RSD) lower than 1.9% for seven replicate determinations of 20 mu M Co2+ in various membranes. The optode was stable and was stored for at least 15 days without observing any change in its sensitivity.
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