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| Titel: |
Behaviour of DDT in Chinese tropical soils |
| Auteur: |
Xu, Bujin Jianying, Gang Yongxi, Zhang Haibo, Lin |
| Verschenen in: |
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes |
| Paginering: | Jaargang 29 (1994) nr. 1 pagina's 37-46 |
| Jaar: |
1994 |
| Inhoud: |
The behaviour of 14C-p,p'-DDT was studied in upland and paddy soils. Under field conditions in subtropical Hangzhou the initial amount declined to 67% after 43 weeks. In tropical upland soil at Guangzhou the original amount was reduced to 46% after 34 weeks indicating faster dissipation rates. Bound residues formed slowly and accounted for approximately 10% of the initial 14C after 43 and 34 weeks in Hangzhou and Guangzhou respectively. Overall dissipation half-lives were 75 and 31 weeks for Hangzou and Guangzhou respectively. The extractable residues contained predominantly DDT and smaller amounts of DDE, DDD and DDA. In paddy flooded soil, 50% of the radioactivity dissipated after approximately six weeks. Extractable residues declined gradually while bound residues slowly increased to represent >50% of the terminal residue after 25 weeks. The dominant product in the extracts after 25 weeks was DDD. It may be concluded that tropical climatic and soil conditions at Guangzhou resulted in a relatively rapid dissipation of DDT, while flooded conditions were highly effective in removing the insecticide. Up to one third of bound 14C-residues formed in paddy flooded soil could be released by incubation with a fresh soil inoculum (1:1) for four months. DDD was a major component in the released products. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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