The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT
Transactions ID Number: 29-839
Full Name: Jiri Kucerik
Position: Associate Professor
Age: ON
Sex: Male
Address: Brno University of Technology, Faculty of Chemistry, Purkynova 118, Brno, 621 00
Country: CZECH REPUBLIC
Tel: +420777633675
Tel prefix:
Fax:
E-mail address: kucerik@fch.vutbr.cz
Other E-mails: kucerik@seznam.cz
Title of the Paper: Ultrasonic spectroscopy and fractal analysis in the study on progressive aggregation of humic substances in diluted solutions
Authors as they appear in the Paper: Jiri Kucerik, Martin Drastik, Oldrich Zmeskal, Anna Ctvrtnickova
Email addresses of all the authors:
Number of paper pages: 11
Abstract: : High resolution ultrasonic spectroscopy was used to study progressive aggregation and structural changes in diluted aquatic solutions of humic substances over the concentration range from 0.001 g/L to 3 g/L. For this purpose, both sodium salts (fulvates) and protonized forms of fulvic acids and sodium salts of humic acids (humates) were used; the origin of humic substances covered wide range of sources. Obtained results confirmed previously published statement about the progressive aggregation of humic substances in diluted solutions. The method allowing the treatment of obtained data by fractal analysis was developed and tested. Determined dependency of fractal dimension on concentration revealed clear differences in mechanisms of aggregation of individual humic and fulvic samples. In fact the value of fractal dimension 2.5 was determined for the concentration 3g/L; diluting the solution caused increasing in fractal dimension value up to 3 for concentrations aro!
und 0.01 g/L. The increase was not the same for all samples, in fact the most significant fluctuation in this concentration range was observed for fulvic acids. It was found out that despite the prevalence of hydrophobic forces in stabilization of humic substances in diluted solutions, also the nature of the counterion represents one of the crucial factors playing role in conformation and stability of humates and fulvates. In accordance with previous observations based on the measurement of lignite humates, also humates, fulvates and fulvic acids originating from various sources showed the change in their aggregates properties around the concentration 1 g/L.
Keywords: Humic and fulvic acids, aggregation, IHSS, ultrasonic spectroscopy, fractal analysis, micelle-like structures
EXTENSION of the file: .pdf
Special (Invited) Session: Aggregation of humic an fulvic acids in diluted solutions
Organizer of the Session: 619-224R
How Did you learn about congress: prof. Pellegrino Conte, pellegrino.conte@unipa.it; dr. Laurent Grasset laurent.grasset@univ-poitiers.fr
IP ADDRESS: 147.229.91.103
