The Use of an Acylhydrazone-Based Metal-Organic Framework in Solid-Contact Potassium-Selective Electrode for Water Analysis.

Paweł Kościelniak,Marcin Wieczorek,Monika Szufla,Jolanta Kochana,Jan Migdalski,Marek Dębosz,Dariusz Matoga

doi:10.3390/ma15020579

Paweł Kościelniak, Marcin Wieczorek + Show 5 more

Open Access

https://doi.org/10.3390/ma15020579

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Journal: Materials	Publication Date: Jan 13, 2022
Citations: 1	License type: CC BY 4.0

Affiliation: Jagiellonian University, AGH University of Krakow

Abstract

A solid-contact ion-selective electrode was developed for detecting potassium in environmental water. Two versions of a stable cadmium acylhydrazone-based metal organic framework, i.e., JUK-13 and JUK-13_H2O, were used for the construction of the mediation layer. The potentiometric and electrochemical characterizations of the proposed electrodes were carried out. The implementation of the JUK-13_H2O interlayer is shown to improve the potentiometric response and stability of measured potential. The electrode exhibits a good Nernstian slope (56.30 mV/decade) in the concentration range from 10−5 to 10−1 mol L−1 with a detection limit of 2.1 µmol L−1. The long-term potential stability shows a small drift of 0.32 mV h−1 over 67 h. The electrode displays a good selectivity comparable to ion-selective electrodes with the same membrane. The K-JUK-13_H2O-ISE was successfully applied for the determination of potassium in three certified reference materials of environmental water with great precision (RSD < 3.00%) and accuracy (RE < 3.00%).

Highlights

Water is one of the most plentiful and essential compounds on the Earth and one of the most critical to life
Investigations of water quality can be carried out using a lot of analytical techniques including classical ones, such as titrimetry or gravimetry, and modern ones, such as atomic absorption spectrometry (AAS), inductively coupled plasma-mass spectrometry (ICP-MS), photometry, or UV-Vis spectrophotometry [3]
This work demonstrates the first use of acylhydrazone-based Metal organic frameworks (MOFs) as modifiers of working electrodes for potentiometric sensing in aqueous solutions

Summary

Introduction

Water is one of the most plentiful and essential compounds on the Earth and one of the most critical to life. It is a good solvent for many substances, whose levels should be controlled. Water analysis is crucial in areas such as public health or environmental studies [1]. It covers the monitoring of such parameters such as physicochemical, biological and chemical properties. Investigations of water quality can be carried out using a lot of analytical techniques including classical ones, such as titrimetry or gravimetry, and modern ones, such as atomic absorption spectrometry (AAS), inductively coupled plasma-mass spectrometry (ICP-MS), photometry, or UV-Vis spectrophotometry [3]. The majority of them require sample pretreatment and do not comply with the principles of green chemistry [2]

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