A new paper-based analytical device based on bulk ion-selective optodes (ISOs) for dual Ag+ and Hg2+ detection has been developed. A plasticized PVC hydrophobic phase composed of 25,27-di(benzothiazolyl)-26,28-hydroxycalix[4]arene (CU1) as an ion-selective ionophore, potassium tetrakis(4-chlorophenyl)borate as an ion-exchanger and chromoionophore XIV as a lipophilic pH indicator was entrapped in the pores of cellulose paper. This paper strip showed higher selectivity for Ag+ and Hg2+ over common alkali, alkaline earth and some transition metal ions with a color change from blue to yellow. With the proposed sensor, Ag+ and Hg2+ can be measured with the range of 1.92 × 10-6 to 5.00 × 10-3 M for Ag+ and 5.74 × 10-7 to 5.00 × 10-5 M for Hg2+ with a limit of detection of 1.92 × 10-6 M for Ag+ and 5.74 × 10-7 M for Hg2+. The proposed sensor was successfully applied to determine the amount of mercury in various water sources and the amount of silver in cleaning product samples containing silver nanoparticles (AgNPs). The results were in good agreement with inductively couple plasma-optical emission spectrometric measurements (ICP-OES).

中文翻译：

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用于双比色 Ag+ 和 Hg2+ 检测的含有苯并噻唑杯[4]芳烃的纸基阳离子选择性光极传感器

已经开发了一种基于体离子选择性光极 (ISO) 的新型纸质分析设备，用于双 Ag+ 和 Hg2+ 检测。由 25,27-二(苯并噻唑基)-26,28-羟基杯[4]芳烃 (CU1) 作为离子选择性离子载体、四（4-氯苯基）硼酸钾作为离子交换剂和发色离子载体组成的增塑 PVC 疏水相XIV 作为亲脂性 pH 指示剂被截留在纤维素纸的孔中。该纸条显示出对 Ag+ 和 Hg2+ 的选择性高于常见碱金属、碱土金属和一些颜色从蓝色变为黄色的过渡金属离子。使用建议的传感器，Ag+ 和 Hg2+ 的测量范围为 1.92 × 10-6 至 5.00 × 10-3 M（Ag+）和 5.74 × 10-7 至 5.00 × 10-5 M（Hg2+），检测限为Ag+ 为 1.92 × 10-6 M，Hg2+ 为 5.74 × 10-7 M。所提出的传感器已成功应用于测定各种水源中的汞含量和含有银纳米颗粒 (AgNPs) 的清洁产品样品中的银含量。结果与电感耦合等离子体光发射光谱测量 (ICP-OES) 非常吻合。