Skip to main content
SpringerLink
Log in

Characterization of di(2-ethylhexyl)thiophosphoric acid by potentiometric titration and capillary zone electrophoresis

  • ORIGINAL PAPER
  • Published:
Fresenius' Journal of Analytical Chemistry Aims and scope Submit manuscript

Abstract

 The acidity constant of di(2-ethylhexyl) thiophosphoric acid (DEHTPA) was investigated using potentiometric measurements with a pH glass electrode. Owing to the low solubility of DEHTPA in pure water, its concentration and acidity constants were determined by linearised pH-metric titration in 16.7% ethanol. A Ka value of (2.39±0.08)×10-4 was obtained. Quantitative determination of DEHTPA was performed by capillary zone electrophoresis (CZE) with carbonate buffer (pH 11.0) as a background electrolyte, operating at −20 kV with direct UV detection at 210 nm. The migration time was 8.97 min and the detection limit was 5 ppm.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Author information

Authors and Affiliations

  1. On leave from Department of Analytical Chemistry, Faculty of Natural Sciences, Tirana University, Tirana, Albania, , , , , , AL

    A. Merkoçi

  2. Department of Chemical Engineering, Universitat Politècnica de Catalunya, E.T.S.E.I.B., Diagonal 647, E-08028 Barcelona, Spain, , , , , , ES

    A. Sastre & J. L. Cortina

  3. Department of Inorganic, Metallo-organic and Analytical Chemistry, University of Padova, Via Marzolo 1,I-35131 Padova, Italy, , , , , , IT

    C. Maccà

Authors
  1. A. Merkoçi
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. Sastre
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. J. L. Cortina
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. C. Maccà
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Received: 2 September 1996/Revised: 19 November 1996/Accepted: 21 November 1996

Rights and permissions

Reprints and permissions

About this article

Cite this article

Merkoçi, A., Sastre, A., Cortina, J. et al. Characterization of di(2-ethylhexyl)thiophosphoric acid by potentiometric titration and capillary zone electrophoresis. Fresenius J Anal Chem 358, 489–492 (1997). https://doi.org/10.1007/s002160050452

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1007/s002160050452

Keywords

Search

Navigation