Publication detail

Complexation of metal ions with solid humic acids, humic colloidal solutions, and humic hydrogel.

KLUČÁKOVÁ, M.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

The complexation kinetics of Co(II), Cu(II), and Ni(II) ions with humic acids is studied in this work. Humic acids were used in three different forms: solid powder, colloidal solution (sol), and hydrogel. The pseudosecond- order rate equation was used as the basic equation for the mathematical description of the complexation kinetics in the humic systems. Three different methods were applied to monitor the concentration changes in studied systems (conductometry, potentiometry, and UV/VIS spectroscopy). The double-linear fit was obtained in all cases. This is an indication that there are two principal types of metal binding sites in humic acids in all used forms. The strongest active centers are probably occupied in the first step, and slower interactions with less preferable binding sites and the rearrangement of formed complex follow in the second step. The values of rate constants were much higher for the first step in all cases. The highest values were obtained for humic sol and Cu(II) ions and the lowest ones for humic solid powder and Ni(II) ions. In general, the complexation rate increased in the following order: humic powder, sol, and hydrogel for all used metal ions and analytical methods.

Keywords

colloid; complexation; humic acids; kinetics; metal ions

Authors

KLUČÁKOVÁ, M.

RIV year

2014

Released

15. 10. 2014

Publisher

Mary Ann Liebert, Inc.

ISBN

1092-8758

Periodical

ENVIRONMENTAL ENGINEERING SCIENCE

Year of study

Number

State

United States of America

Pages from

612

Pages to

620

Pages count

BibTex

@article{BUT109783,
  author="Martina {Klučáková}",
  title="Complexation of metal ions with solid humic acids, humic colloidal solutions, and humic hydrogel.",
  journal="ENVIRONMENTAL ENGINEERING SCIENCE",
  year="2014",
  volume="31",
  number="11",
  pages="612--620",
  doi="10.1089/ees.2013.0487",
  issn="1092-8758"
}