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A solid-contact ion selective electrode for copper(II) using a succinimide derivative as ionophore.

Tutulea-Anastasiu MD, Wilson D, del Valle M, Schreiner CM, Cretescu I - Sensors (Basel) (2013)

Bottom Line: The electrode shows a fast response time of 0.25 s.The electrode exhibits a Super-Nernstian response, with 37.5 mV/decade, with a potentiometric detection limit of 4.4 µM.The proposed sensor revealed good selectivity towards a group of transition metal ions.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University, Iasi, Romania. dtutulea@tuiasi.ro

ABSTRACT
All-solid-state sensors with polyvinyl chloride (PVC)-based membranes using off-the-shelf N-hydroxysuccinimide (NHS) and succinimide (Succ) ionophores were prepared using DOP (dioctyl phthalate) and NPOE (ortho-nitrophenyloctyl ether) as plasticizers. Good responses were obtained when NHS was used. The potentiometric response of the proposed electrode is independent of pH over the range 2-6. The electrode shows a fast response time of 0.25 s. The electrode exhibits a Super-Nernstian response, with 37.5 mV/decade, with a potentiometric detection limit of 4.4 µM. The proposed sensor revealed good selectivity towards a group of transition metal ions.

No MeSH data available.


Effect of pH on the observed sensitivities for the four membranes evaluated.
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f3-sensors-13-04367: Effect of pH on the observed sensitivities for the four membranes evaluated.

Mentions: The influence of pH on the potential response of the proposed sensors was studied over the pH range 2–12 (adjusted with HNO3 or NaOH) at two Cu(II) ion concentration values, 1.0 × 10−3 and 1.0 × 10−4 mol·L−1. Obvious changes of the potential values with the pH value are noticed, as presented in Figure 2 for a concentration value of 10−3 mol·L−1. A similar behavior, but with less effect by the pH change, was observed for the lower concentration. Essentially, the potentials remain unchanged in a pH range from 2 to 6 (Figure 3), which is considered to be the working pH range of the developed Cu(II) selective electrode. An increase of the potential could be explained due to the formation of hydroxyl complexes of Cu(II) in solution, while, at the lowest pH, certain protonation of the ligand can be ascertained. This usable pH range can be highlighted as one of the widest available among different ionophore-based Cu(II) sensors (Table 1).


A solid-contact ion selective electrode for copper(II) using a succinimide derivative as ionophore.

Tutulea-Anastasiu MD, Wilson D, del Valle M, Schreiner CM, Cretescu I - Sensors (Basel) (2013)

Effect of pH on the observed sensitivities for the four membranes evaluated.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673088&req=5

f3-sensors-13-04367: Effect of pH on the observed sensitivities for the four membranes evaluated.
Mentions: The influence of pH on the potential response of the proposed sensors was studied over the pH range 2–12 (adjusted with HNO3 or NaOH) at two Cu(II) ion concentration values, 1.0 × 10−3 and 1.0 × 10−4 mol·L−1. Obvious changes of the potential values with the pH value are noticed, as presented in Figure 2 for a concentration value of 10−3 mol·L−1. A similar behavior, but with less effect by the pH change, was observed for the lower concentration. Essentially, the potentials remain unchanged in a pH range from 2 to 6 (Figure 3), which is considered to be the working pH range of the developed Cu(II) selective electrode. An increase of the potential could be explained due to the formation of hydroxyl complexes of Cu(II) in solution, while, at the lowest pH, certain protonation of the ligand can be ascertained. This usable pH range can be highlighted as one of the widest available among different ionophore-based Cu(II) sensors (Table 1).

Bottom Line: The electrode shows a fast response time of 0.25 s.The electrode exhibits a Super-Nernstian response, with 37.5 mV/decade, with a potentiometric detection limit of 4.4 µM.The proposed sensor revealed good selectivity towards a group of transition metal ions.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University, Iasi, Romania. dtutulea@tuiasi.ro

ABSTRACT
All-solid-state sensors with polyvinyl chloride (PVC)-based membranes using off-the-shelf N-hydroxysuccinimide (NHS) and succinimide (Succ) ionophores were prepared using DOP (dioctyl phthalate) and NPOE (ortho-nitrophenyloctyl ether) as plasticizers. Good responses were obtained when NHS was used. The potentiometric response of the proposed electrode is independent of pH over the range 2-6. The electrode shows a fast response time of 0.25 s. The electrode exhibits a Super-Nernstian response, with 37.5 mV/decade, with a potentiometric detection limit of 4.4 µM. The proposed sensor revealed good selectivity towards a group of transition metal ions.

No MeSH data available.