Laboratory studies on volatilization and mineralization of 14c‐p,p'‐DDT in soil,release of bound residues and dissipation from solid surfaces |
| |
Authors: | MM Andréa RY Tomita LC Luchini MR Musumeci |
| |
Institution: | Instituto Biológico , Centro de Radioisótopos , C.P. (P.O. Box), S?o Paulo, 7119 01064–970, SP, Brazil |
| |
Abstract: | Abstract In support of field data, laboratory studies were conducted on volatilization, mineralization and binding of 14C‐p,p'‐DDT in soils at Sao Paulo. Incubation of soil for 6 weeks did not result in volatilized organics or mineralization; with >95% extractable radiocarbon in the form of p,p'‐DDT. Small amounts of bound residues (1.8%) were detected in soil. These data confirm the very slow dissipation of DDT in the field which presumably relates to the acidic pH of soil (4.5–4.8). Bound 14C‐residues in soils treated with 14C‐p,p'‐DDT at Praia Grande and Sao Paulo could be released (5–21%) by sulphuric acid treatment. The released residue had the composition: 69–90% DDT, 7–32% DDD and 0–3% DDE. Incubation of soil bound 14C‐residues with fresh inoculum for 3 months did not result in release of 14C. Dissipation from wooden surfaces was fairly slow. After 20 weeks, 74% of the applied radioactivity could be recovered; 44% hexane‐non‐extractable. |
| |
Keywords: | 14C‐p p'‐DDT soil release of bound residues dissipation from wooden surfaces |
|
|