Potentiometric PVC membrane ion–selective electrode for the determination of Sr(II) ions

Sensors International Pub Date : 2022-01-01 DOI:10.1016/j.sintl.2022.100185

Oguz Özbek

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Abstract

In this study, an ion–selective electrode was developed for the potentiometric determination of strontium ions. Membrane optimization studies showed that the most suitable membrane composition was 4.0% (w/w) synthesized ionophore, 63.0% (w/w) bis(2–ethylhexyl)sebacate (BEHS), 32.0% (w/w) poly(vinyl chloride; PVC) and 1.0% (w/w) potassium tetrakis(p–chlorophenyl)borate (KTpClPB) in terms of potentiometric performance characteristics. The electrode, which exhibits a stable potentiometric behaviour, shows a linear response in the concentration range of 1.0 × 10⁻⁵ – 1.0 × 10⁻¹ mol L⁻¹ (R² = 0.998). The electrode has a detection limit of 7.94 × 10⁻⁶ mol L⁻¹ and a fast response time of 7s. The electrode exhibits selectivity against Sr(II) ions in the presence of some cationic species and works without being affected by pH changes in the pH range of 6.0–9.0. The proposed electrode performs the determination of Sr(II) ions in water samples with high recoveries.

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电位法PVC膜离子选择电极测定Sr(II)离子

本研究建立了一种离子选择电极，用于电位法测定锶离子。膜优化研究表明，最合适的膜组成为4.0% (w/w)合成离子载体、63.0% (w/w)双(2 -乙基己基)癸二酸酯(BEHS)、32.0% (w/w)聚氯乙烯;PVC)和1.0% (w/w)四对氯苯硼酸钾(KTpClPB)的电位性能特性。电极具有稳定的电位行为，在1.0 × 10−5 ~ 1.0 × 10−1 mol L−1浓度范围内呈线性响应(R2 = 0.998)。该电极的检出限为7.94 × 10−6 mol L−1，响应时间为7s。该电极对Sr(II)离子具有选择性，在6.0 ~ 9.0的pH范围内不受pH变化的影响。该电极可用于水样中Sr(II)离子的测定，回收率高。

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来源期刊

Sensors International

CiteScore

17.40

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0.00%

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