摘要
应用１４Ｃ毒死蜱研究了５种淡水水生物对毒死蜱（１４Ｃｃｈｌｏｒｐｙｒｉｆｏｓ）的吸收、分布、消长的规律。结果表明：５种生物在１４Ｃ毒死蜱的水溶液中暴露４ｈ，均能迅速吸收１４Ｃ毒死蜱，经过２４ｈ，５种生物对１４Ｃ毒死蜱的ＣＦ（浓集系数）从高至低的顺序为：食蚊鱼＞石螺＞扁卷螺＞浮萍＞西洋菜。当暴露２４或４８ｈ，３种试验动物对１４Ｃ毒死蜱吸收的量已达高峰。食蚊鱼、石螺和扁卷螺的ＣＦ分别为３７５、２４９６９和３０。两种植物对１４Ｃ毒死蜱的吸收高峰是在暴露４和２４ｈ。浮萍和西洋菜的ＣＦ分别为２８５４和７７８。不论动物或植物种类，当ＣＦ达高峰后，其比活度均随时间的延长而下降。本生态系统各种生物对试验水溶液中１４Ｃ毒死蜱吸收４ｈ后，水中１４Ｃ的放射性活度迅速降低为原来的６７％，２４ｈ后降低为原来的一半，在第４ｄ以后，由于试验生物排出含有１４Ｃ的排泄物，因而水中１４Ｃ放射性活度略有升高。
The absorption, distribution, dynamics of chlorpyrifos in five fresh water organisms were studied. The results showed that all organisms tested absorbed 14 C chlorpyrifos rapidly in si mulation ecosystem for 4 h of exposure. The concentration factors (CF) of 14 C chlorpyrifos in the organisms were in order of Gambusia affinis>Bellarnya purificata>Planorbis sp.> Lenna polyrrhiza>Naslurtium officincles on the 2nd day of the experiment. The absorption of 14 C chlorpyrifos by three kinds of animals showed that the 14 C radioactivity reached peaks after 24 h or 48 h of exposure to the pesticide. The concentration factors of Gambusia affinis (48 h), Bellarnya purificata (48 h) and Planorbis sp.(24 h) were 375,249 69 and 30 respectively. The absorption peaks expressed in concentration factors in Lenna polyrrhiza and Naslurtium officincles, were 28 54 and 7 78 at 4 and 24h respectively. After the absorption peaks, the radioactivity in all experimental animals and plants decreased with increase of time. After 4 h, the radioactivity in water rapidly decreased to 67% of the original and it decreased to about one half of the original after 24 h. Then the radioactivity of 14 C in water slightly increased due to the excreta of the organisms.
出处
《核农学报》
CAS
CSCD
1998年第5期286-292,共7页
Journal of Nuclear Agricultural Sciences
关键词
农药
生物富集
水生生物
浓集系数
吸收
毒死蜱
C chlorpyifos, aquatic organisms, concentration factors, accumulation, distribution
