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Details van artikel 8 van 24 gevonden artikelen
| Titel: |
Degradation and fate of 14C-ddt and 14C-DDE in Egyptian soil |
| Auteur: |
Zayed, S. M. A. D. Mostafa, I. Y. El-Arab, A. E. |
| Verschenen in: |
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes |
| Paginering: | Jaargang 29 (1994) nr. 1 pagina's 47-56 |
| Jaar: |
1994 |
| Inhoud: |
The dissipation and degradation of 14C-DDT and 14C-DDE in Egyptian soil were studied under field conditions. Both chemicals dissipated readily from soil; DDE, at a slightly higher rate. The time required for 50% initial dissipation of radiocarbon was estimated to be 55 and 50 days for DDT and DDE respectively. After 9 months, the organic extracts of a 14 cm soil column showed the absence of DDT from 14C-DDT treated soils. In 14C-DDE treated soils, extractable residues showed the presence of unchanged DDE as the main component. Throughout the experiment, binding from both chemicals was low (about 2%). The distribution of radiocarbon following soil incubation with 14C-DDT or 14C-DDE in sunlight was determined using quartz tubes. Both compounds were found to be mineralized at a low rate. Within 90 days, the percentage of mineralization was 3 and 2.2% of the applied dose for DDT and DDE, respectively. The maximum binding was 9 and 14.5% for DDT and DDE respectively. In the DDT Experiment, the amount of evolved 14CO2 was greater for the quartz tube experiment than that from dark tubes. Also degradation and binding of DDT was enhanced by sunlight. The quantity of DDE formed amounts to 30% of the applied DDT and represented the main degradation product of DDT in sunlight. On the other hand, DDD was the main product in the dark experiment (9% of the applied dose). |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 8 van 24 gevonden artikelen
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