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Related Experiment Videos

Complexometric determination of metal ions by microscopic diffusional titration

C Yi1, D Huang, M Gratzl

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA.

Analytical Chemistry
|May 1, 1996
PubMed
Summary

This study demonstrates complexometric titrations in pico- and femtoliter microdroplets using a diffusional microburet (DMB). The method successfully quantifies metal ions like Fe(III), Zn(II), and Cu(II) with high accuracy, enabling microscale chemical analysis.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Chemical Analysis

Background:

  • Previous work established acid/base titrations in pico- and femtoliter microsamples using a diffusional microburet (DMB).
  • The DMB achieved delivery rates as low as 6 fmol/s, with prior studies exploring its potential for microscale reagent delivery.

Purpose of the Study:

  • To explore the feasibility of complexometric titrations in microscopic samples.
  • To investigate the stability of pH in microdroplets and the effects of DMB shank geometry on titration characteristics.

Main Methods:

  • Performed diffusional microtitrations of Fe(III), Zn(II), and Cu(II) using ethylenediaminetetraacetic acid (EDTA).
  • Utilized Xylenol orange and Eriochrome Black T as indicators for clear endpoint detection in microdroplets.

Related Experiment Videos

  • Studied pH stability in microdroplets and optimized DMB shank geometry for titration performance.

    • Main Results:

    • Successfully performed complexometric titrations of Fe(III), Zn(II), and Cu(II) in microdroplet samples ranging from 16 to 1570 pL.
    • Achieved low random errors: 6.6% for Fe(III), 5.8% for Cu(II), and 7.9% for Zn(II).
    • Demonstrated that microdroplet titrations are feasible in both acidic and alkaline conditions by controlling pH and CO2 exposure.

    Conclusions:

    • Complexometric titrations are feasible in microdroplets using the diffusional microburet (DMB) technique.
    • The method allows for the accurate quantification of various metal ions in microscopic sample volumes.
    • This technique opens possibilities for chemical manipulations in microdroplets, including potential applications in biological cells.