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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F14%3APU110729" target="_blank" >RIV/00216305:26310/14:PU110729 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1089/ees.2013.0487" target="_blank" >http://dx.doi.org/10.1089/ees.2013.0487</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1089/ees.2013.0487" target="_blank" >10.1089/ees.2013.0487</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/LO1211" target="_blank" >LO1211: Centrum materiálového výzkumu na FCH VUT v Brně - udržitelnost a rozvoj</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ENVIRONMENTAL ENGINEERING SCIENCE

ISSN

1092-8758

e-ISSN

1557-9018

Svazek periodika

31

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

612-620

Kód UT WoS článku

000343898200004

EID výsledku v databázi Scopus

2-s2.0-84931446015