The Effect of Paper on the Detection Limit of Paper-Based Potentiometric Chloride Sensors

Eliza J. Herrero, Blair K. Troudt, Philippe Bühlmann

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2 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)14898-14905
Number of pages8
JournalAnalytical Chemistry
Issue number43
StatePublished - Nov 1 2022

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation under Grant Nos. CHE-1710024 and 2203752 to P.B. as well as a Graduate Research Fellowship from the National Science Foundation to E.J.H.

Publisher Copyright:
© 2022 American Chemical Society.


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