Detail publikace

New insights into aggregation and conformational behaviour of humic substances: Application of high resolution ultrasonic spectroscopy

KUČERÍK, J. ŠMEJKALOVÁ, D. ČECHLOVSKÁ, H. PEKAŘ, M.

Originální název

New insights into aggregation and conformational behaviour of humic substances: Application of high resolution ultrasonic spectroscopy

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

The potential of high resolution ultrasonic analysis (HRUS) in humic acid colloidal properties research has been demonstrated. Sodium salts of humic acids from soil and lignite showed similar behaviour, supporting the hypothesis that, at both neutral and alkaline pH, they aggregate from very low concentration. The same conclusion can be reached for solutions at high ionic strength. We tried to apply the same procedure as used for the study of micellization and determination of critical micelle concentration of common surfactants. As expected, our experiments did not show the same break as demonstrated on the HRUS records for sodium dodecyl sulfate, at least in the range of measured concentration (i.e. from 0.001 up to 10 g/L). The colloidal state of humic acids in aqueous solution is very sensitive to the presence of other, both charged and neutral, molecules. Aggregation of humic acids can be disturbed or promoted, depending on the concentration, by electrostatic or other weak interactions with extraneous molecules. Structures of varying mechanical strength (rigidity) can be formed in solutions of the same components but at different concentration. Such behaviour reflects mechanisms which occur during the sequestration of hydrophobic organic compounds and has several implications for the protection/ transportation of labile structures and contaminants which are hypothesized to be encapsulated within hydrophobic pockets of soluble humic aggregates.

Klíčová slova

humic substances, aggregation, high resolution ultrasonic spectroscopy

Autoři

KUČERÍK, J.; ŠMEJKALOVÁ, D.; ČECHLOVSKÁ, H.; PEKAŘ, M.

Rok RIV

2007

Vydáno

9. 8. 2007

Nakladatel

Elsevier

ISSN

0146-6380

Periodikum

ORGANIC GEOCHEMISTRY

Ročník

38

Číslo

1

Stát

Spojené království Velké Británie a Severního Irska

Strany od

2098

Strany do

2110

Strany počet

13

BibTex

@article{BUT44948,
  author="Jiří {Kučerík} and Daniela {Šmejkalová} and Hana {Čechlovská} and Miloslav {Pekař}",
  title="New insights into aggregation and conformational behaviour of humic substances: Application of high resolution ultrasonic spectroscopy",
  journal="ORGANIC GEOCHEMISTRY",
  year="2007",
  volume="38",
  number="1",
  pages="2098--2110",
  issn="0146-6380"
}