Composition, particle size, charge and colloidal stability of pH-fractionated humic acids

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F15%3APU113810" target="_blank" >RIV/00216305:26310/15:PU113810 - isvavai.cz</a>

Result on the web

<a href="http://link.springer.com/article/10.1007/s11368-015-1142-2?wt_mc=email.event.1.SEM.ArticleAuthorAssignedToIssue" target="_blank" >http://link.springer.com/article/10.1007/s11368-015-1142-2?wt_mc=email.event.1.SEM.ArticleAuthorAssignedToIssue</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11368-015-1142-2" target="_blank" >10.1007/s11368-015-1142-2</a>

Result language

angličtina

Original language name

Composition, particle size, charge and colloidal stability of pH-fractionated humic acids

Original language description

Purpose: The purpose of this study was to divide humic acids into several fractions by means of their dissolving in buffers with different pH values and to characterize obtained humic fractions with respect to their composition, structure, particle size and charge. Relation-ships between determined characteristics of fractionated humic acids and pH values of used buffer solutions and the method of fractionation was investigated. Materials and methods: Humic acids were fractionated by means of two different methods: the subsequent dissolution in buffers adjusted to different pH and the sequential dissolution in buffers with increasing pH values. Composition, structure and properties of the obtained humic fractions were studied using elemental analysis, FT-IR spectroscopy, UV/VIS spectroscopy and light scattering methods. Results and discussion: As expected, fractions obtained by subsequent dissolution were more heterogeneous than those prepared by sequential extraction. Fractions obtained at lower pH values contained higher amounts of aromatic and carboxylic groups, while those extracted at higher pH values were rich in aliphatic and/or peptide groups. Fractions extracted close to neutral pH region had some specific properties. Functional groups dissociated in a range of pH values depending on the chemical structure of the molecules. Weaker carboxylic groups could dissociate in less acidic solutions and more aromatic fractions could be dissolved. Conformational changes and deaggregation process differed with the fractionation procedure and concentration of studied solutions. A bimodal distribution of particle sizes and higher values of polydispersity were obtained for some for less concentrated solutions of humic fractions. Conclusions: Obtained humic fractions behave as anionic heterogeneous ligands with many carboxylic and phenolic groups of different strength, and present polyfunctional and polyelectrostatic effects due to different functional sites and net charge

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/LO1211" target="_blank" >LO1211: Materials Research Centre at FCH BUT- Sustainability and Development</a><br>

Continuities

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

Publication year

2015

Confidentiality

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

Name of the periodical

Journal of Soils and Sediments

ISSN

1439-0108

e-ISSN

1614-7480

Volume of the periodical

15

Issue of the periodical within the volume

9

Country of publishing house

DE - GERMANY

Number of pages

9

Pages from-to

1900-1908

UT code for WoS article

000359938600006

EID of the result in the Scopus database

2-s2.0-84939472257