Lowering detection limits of copper(II)-selective carbon paste electrodes using an SNO- and an SNNS- Schiff base ligands

Sensors International Pub Date : 2022-01-01 DOI:10.1016/j.sintl.2021.100151

Salman M. Saadeh , Hazem M. Abu Shawish , Mohammed Y. Abu Foul

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引用次数: 5

Abstract

Interestingly, this work presents two newly designed copper(II)-selective carbon paste electrodes with distinctively low detection limits which is attained utilizing the Schiff base ligands 2-(2-hydroxyphenylimino)carboxythiophene (L1) and 1,2-di(2-carboxythiopheneimino] benzene (L2). The sensors exhibit a Nernstian slope of 29.10 and 29.28 mVdecade⁻¹ for Cu(II) ion over a wide concentration range from 1.18 × 10⁻⁷ – 1.00 × 10⁻² M and 7.91 × 10⁻⁸ – 1.00 × 10⁻² M with the detection limits of 1.00 × 10⁻⁷ M and 5.28 × 10⁻⁸ M for L1 and L2 respectively. These sensors exhibit short response time (about 2 s) and good stability over the pH range 2.5–5.8. In addition, the present sensors show fairly good selectivity toward copper(II) ion in comparison to other common cations. Furthermore, they were satisfactorily used as indicator electrodes in complexometric titration with EDTA and for determination of copper(II) in water, tea and urine samples.

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利用SNO-和SNNS-希夫碱配体降低铜(II)选择性碳浆电极的检出限

有趣的是，这项工作提出了两个新设计的铜(II)选择性碳膏电极，具有明显的低检测限，它们是利用希夫碱配体2-(2-羟基苯基)羧噻吩(L1)和1,2-二(2-羧噻吩亚胺)苯(L2)获得的。在1.18 × 10−7 ~ 1.00 × 10−2 M和7.91 × 10−8 ~ 1.00 × 10−2 M的宽浓度范围内，传感器对Cu(II)离子的纳氏斜率分别为29.10和29.28 mVdecade−1,L1和L2的检出限分别为1.00 × 10−7 M和5.28 × 10−8 M。这些传感器具有较短的响应时间(约2秒)和良好的稳定性在pH范围2.5-5.8。此外，与其他常见阳离子相比，该传感器对铜(II)离子表现出相当好的选择性。此外，它们在EDTA络合滴定和水、茶和尿液样品中铜(II)的测定中作为指示电极得到了满意的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors International

CiteScore

17.40

自引率

0.00%

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