Paper-based microfluidic sampling for potentiometric determination of ions

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Grzegorz Lisak, Jingwen Cui, Johan Bobacka
Förläggare: ELSEVIER SCIENCE SA
Publiceringsår: 2015
Tidskrift: Sensors and Actuators B: Chemical
Tidskriftsakronym: SENSOR ACTUAT B-CHEM
Volym: 207
Artikelns första sida, sidnummer: 933
Artikelns sista sida, sidnummer: 939
Antal sidor: 7
ISSN: 0925-4005


Abstrakt

In this work, paper-based microfluidic sampling was used together with potentiometric determination of ions (Cd2+, Cl-, Pb2+) and pH. Calibration solutions and samples were absorbed into paper substrates and potentiometric detection was performed by placing solid-state ion-selective electrodes (ISEs) and a reference electrode in direct contact with the paper substrate. The paper substrate was found to influence the determination of Pb2+ at low concentrations, indicating complexation of Pb2+ by chemically active groups present in paper. Paper-based microfluidic sampling was successfully applied in measurements of pH in various foodstuffs and environmental samples by employing a conventional pH glass electrode. However, some influence of the paper substrate on the measured pH was observed for samples with pH close to neutral. Despite some limitations, paper-based microfluidic sampling with potentiometric sensing opens new possibilities for direct chemical analysis of specific sample types. The method described in this work is particularly interesting for analysis of small sample volumes with a high content of solid impurities and for analysis of e.g. liquid or moisture from polluted surfaces and foodstuff.


Nyckelord

Analysis of foodstuff, Ion-selective electrodes, Paper-based sampling, pH determination, Potentiometric sensors

Senast uppdaterad 2020-02-04 vid 05:28