BEHAVIOR OF ~(14)C-DDT IN SUBTROPICAL FLOODED SOIL

• 作 者: 徐步进 张永熙
• 机 构: Institute of Nuclear - Agricultural Sciences Zhe Jiang Agricultural University Hangzhou 310029 Chin
• 出 处: Nuclear Science and Techniques
• 发表日期: 1993年04期
• 关键词: upland residue faster methanol scanner BEHAVIOR OF paddy environments extracts d

A study on the behavior of p, p’- DDT in flooded soil was conducted from 1990 to 1991. 14C-p,p’-DDT was used as a tracer. TLC, ARG techniques were used. A chromatography scanner was used to determine the radioactivity in spots of TLC plates. The behavior of DDT in flooded soil is different from that in upland soil. The dissipation of DDT was faster, DDT and its metabolites moved down faster, and more radioactivity became to bound residue in flooded soil as compared with those in upland situation. In extracts, DDT, DDD, DDE, DDA and an unidentified product were detected and their amounts were changed with time. About 90 % of the DDT disappeared and DDD became the key component of extractable residue within 8 weeks in flooded soil, whereas DDT took about 80% of the methanol extractable residue in 43 rd week sample of upland soil.

A study on the behavior of p, p’-DDT in flooded soil was conducted from 1990 to 1991. 14C-p, p’-DDT was used as a tracer. TLC, ARG techniques were used. the radio of activity in spots of TLC plates. The behavior of DDT in flooded soil is different from that in upland soil. The dissipation of DDT was faster, DDT and its metabolites moved down faster, and more radioactivity became bound residue in flooded soil as compared to With extracts of DDT, DDD, DDE, DDA and an unidentified product were detected and their amounts were changed with time. About 90% of the DDT disappeared and DDD became the key component of extractable residue within 8 weeks in flooded soil, compared DDT took about 80% of the methanol extractable residue in 43 rd week sample of upland soil.