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Dual-Mode Fluorescence and Visual Fluorescent Test Paper Detection of Copper Ions and EDTA

Wanqing Xu1, Xiaoliang Hao1, Tongtong Li1

  • 1School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, PR China.

ACS Omega
|November 8, 2021
PubMed

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In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
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The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
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