Lead assays with smartphone detection using a monolithic rod with 4-(2-pyridylazo) resorcinol

Journal article

Authors/Editors

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Publication Details

Author list: Issarangkura Na Ayutthaya P., Yeerum C., Kesonkan K., Kiwfo K., Grudpan K., Teshima N., Murakami H., Vongboot M.

Publisher: MDPI

Publication year: 2021

Journal: Molecules (1420-3049)

Volume number: 26

Issue number: 18

Start page: 5720

ISSN: 1420-3049

eISSN: 1420-3049

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85115414642&doi=10.3390%2fmolecules26185720&partnerID=40&md5=4d78d60d9594fdded9da8db87fe67823

Languages: English-Great Britain (EN-GB)

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Abstract

A monolithic rod of polyurethane foam–[4-(2-pyridylazo) resorcinol] (PUF–PAR) as a simple chemical sensor for lead assays with smartphone detection and image processing was developed. With readily available simple apparatus such as a plastic cup and a stirrer rod, the monolithic PUF rod was synthesized in a glass tube. The monolithic PUF–PAR rod could be directly loaded by standard/sample solution without sample preparation. A one-shot image in G/B value from a profile plot in ImageJ for a sample with triplicate results via a single standard calibration approach was obtained. A linear single standard calibration was: [G/B value] = −0.038[µg Pb2+] + 2.827, R2 = 0.95 for 10–30 µg Pb2+ with a limit of quantitation (LOQ) of 33 µg L−1. The precision was lower than 15% RSD. The proposed method was tested by an assay for Pb2+ contents in drinking water samples from Bangkok. The results obtained by the proposed method agree with those of ICP-OES and with 100– 120% recovery, demonstrating that the method is useful for screening on-site water monitoring. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Chemical sensor, Monolithic polyurethane foam–[4-(2-pyridylazo) resorcinol], On-site screening, Water monitoring