摘要
￣（１４）Ｃ－ＤＤＴ示踪实验结果表明：地处广州亚热带地区的水稻，施用ＤＤＴ农药，在植株各器官中消失很快，整株总的ＤＤＴ的衰变常数是２９．４×１０￣（－２）／ｄ，半衰期（Ｔ＿（５０））为２３．６ｄ，残留量与施药时到收获期时间的长短和施药次数有关，实验证明：可溶态ＤＤＴ约占总残留量的７５％，约有２５％转化为结合态ＤＤＴ；水稻在收获前１５ｄ进行最后一次施用ＤＤＴ１０００ｍｇ／ｋｇ是安全的。
The Residue and fate of DDT in paddy rice of subtropical environment were studied byradionuclear tracing. The results obtained were as follows:Loss rate of DDT was rapidly underthe subtropical agroecosystem in Guangzhou, Using normal spray dosage in agroecosystem,DDTresidue in spikes of paddy rice is not over the trace standard( 7 mg/kg),The DDT residue was2. 1 mg/kg in rice bran,1.8 mg/kg in grain residue was 5. 8 mg/kg in rice bran,4.5 mg/kg ingrain of rice when applicated three times at tillering stage,booting stage and filling stage, It main-lv exists in stems and leaves.Therefore ,using normal spray dosage 1000 mg/kg DDT of 15 daysbefore harvesting stage in subtropical crops is safe.
出处
《中山大学学报（自然科学版）》
CSCD
1995年第4期59-63,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
