The Effect of Paper on the Detection Limit of Paper-Based Potentiometric Chloride Sensors
The Effect of Paper on the Detection Limit of Paper-Based Potentiometric Chloride Sensors
复制标题
纸张对纸基电位氯离子传感器检测限的影响
DOI：
10.1021/acs.analchem.2c02261
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发表时间：
2022
影响因子：
7.4
通讯作者：
Bühlmann, Philippe
中科院分区：
文献类型：
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作者：
Herrero, Eliza J.;Troudt, Blair K.;Bühlmann, Philippe
虽然纸张是用于许多其他便携式传感器的优良材料，但据报道，基于纸张的电位计传感器的性能比传统的杆状电极差，特别是考虑到检测限（lod）。本文报道了一项深入研究，使用包含AgCl/Ag换能器的纸质设备测量cl的较低LOD。研究发现，来自两种常用器件材料（一种AgCl/Ag油墨和所谓的无灰滤纸）的cl污染会使含有纸张的样品中cl的浓度大大高于传感器中AgCl自发溶解的预期水平，从而使较低的lod进一步恶化。此外，对于Ag+，通常假设的金属阳离子在滤纸上的吸附并不会显著影响AgCl/Ag换能器的性能。我们注意到，在化学分析的背景下，文献中经常提到纸张的金属杂质，而忽略了纸张的cl污染。
While paper is an excellent material for use in many other portable sensors, potentiometric paper-based sensors have been reported to perform worse than conventional rod-shaped electrodes, in particular in view of limits of detection (LODs). Reported here is an in-depth study of the lower LOD for Cl–measurements with paper-based devices comprising AgCl/Ag transducers. Contamination by Cl–from two commonly used device materials─a AgCl/Ag ink and so-called ashless filter paper─was found to increase the concentration of Cl–in paper-contained samples far above what is expected for the spontaneous dissolution of the transducer’s AgCl, thereby worsening lower LODs. In addition, for the case of Ag+, the commonly hypothesized adsorption of metal cations onto filter paper was found not to significantly affect the performance of AgCl/Ag transducers. We note that in the context of chemical analysis, metal impurities of paper are often mentioned in the literature, but Cl–contamination of paper has been overlooked.