Varnish polish functionalized paper as a new solid platform for colorimetric determination of copper (II) in water

Doaa S. Al-Raimi, Khairia M. Al-Ahmary, Hesham M. Harbi, Basma G. Alhogbi, Manal A. Khoj, Hassan O. Alwael, Liyakat H. Mujawar, Mohammad S. El-Shahawi*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In the current strategy, a highly sensitive and fast one-step colorimetric assay for trace determination of Cu2+ in water is presented. The planned assay was based upon the use of varnish polish-modified filter paper printed with 2-[5-(2-hydroxy-5-sulfophenyl)-3-phenyl-1-formazyl] benzoic acid monosodium salt, commercially named zincon. Under optimal conditions, the designed assay readily recognised the formation of blue–purple-coloured Cu–ZI chelate in less than 10 min. The proposed probe was able to detect Cu2+ in the concentration range from 0.04 to 10 μg/mL (6.34 × 10−1 to 1.59 × 103µM), with low limit of detection (LOD) of 0.01 μg/mL (1.59 × 10−1 µM). The LOD was 10-fold lower than the allowable level for Cu2+ in drinking water set by WHO legislation. The assay was applied for Cu2+determination in water with acceptable recoveries (89.6–102.1%) and precision (<3%). Therefore, the proposed sensing assay might be considered as a potential rapid and low-cost candidate for total determination and speciation of Cu2+in water samples.

Original languageEnglish
JournalInternational Journal of Environmental Analytical Chemistry
Number of pages21
ISSN0306-7319
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • Colorimetric one-step assay
  • copper(II) determination
  • hydrophobic surface
  • varnish polish functionalised filter
  • water samples

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