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Detection of low concentrations of malachite green and crystal violet in water

I Safarík1, M Safariková

  • 1Laboratory of Biochemistry and Microbiology, Institute of Landscape Ecology, Ceské Budejovice, Czech Republic. safarik@uek.cas.cz

Water Research
|January 5, 2002
PubMed

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Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
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 result, EDTA...