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Utilization of a plasticized PVC optical sensor for the selective and efficient detection of cobalt() in environmental samples
Ist Teil von
RSC advances, 2022-06, Vol.12 (29), p.18431-1844
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2022
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
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 μM) and low detection limit (0.015 μM). Low detection and quantification limits and excellent selectivity in the presence of interfering ions such as Fe
3+
, Cu
2+
, Ni
2+
, Ag
+
, Au
3+
, Cr
3+
, Cd
2+
, Zn
2+
, Hg
2+
, and SO
4
2−
make it feasible to monitor Co
2+
ion content accurately and repeatedly in environmental samples with complicated matrices. The optode was regenerated successfully using 0.3 M nitric acid (HNO
3
) solution while its response was reversible with a relative standard deviation (RSD) lower than 1.9% for seven replicate determinations of 20 μM Co
2+
in various membranes. The optode was stable and was stored for at least 15 days without observing any change in its sensitivity.
A novel sensitive, selective, and reversible cobalt(
ii
) ion optical sensor was prepared by the incorporation of [CPDB] and (NaTPB) in a (PVC) membrane containing (DOA) as a plasticizer.