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Details for article 5 of 5 found articles
| Title: |
Kinetics and mechanisms of interaction of simazine with humic acids |
| Author: |
Kalouskova, Natasa |
| Appeared in: |
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes |
| Paging: | Volume 21 (1986) nr. 3 pages 251-268 |
| Year: |
1986 |
| Contents: |
The adsorption of simazine on two fractions of hu-mic acids of different molecular size was investigated at a pH range of 2.5 to 6.2. The amounts of the herbicide adsorbed decreased with increasing pH for both of the two humic acids fractions used and no adsorption was observed at pH 5.5. The adsorption capacity of fraction I (Mv >100,000) exceeded that of fraction IV (Mv < 4,000) over the entire pH region used. No appreciable changes in the adsorbed amounts were observed after 24 hours. Continuous flow dialysis techniques were used to determine the extent of binding between simazine and dissolved humic acids. It was observed that 50% and 60% of simazine added were thus removed from the dialysis bags containing humic acids fractions I and IV,respectively. Higher amounts of simazine were adsorbed by the high molecular weight humic fraction. The adsorption processes involve ionic bonds between simazine and humic acids. In addition it is likely that hydrogen bonds and physical forces are also involved in the adsorption of simazine by humic acids. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 5 of 5 found articles
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