RESUMO
The present study was carried out by treating 100 gm soil with 1 UCi of 14C-Lindane. The untreated and treated soil were layered on the bottom of separate all glass aquarium tanks. These tanks were prepared as aquatic ecosystem model. The experiments were proceeded at pH 7.0, 8.2 and 5.5 and at 35 degrees C and 15 degrees C in complete darkness and light for 60 days. The obtained data revealed that, the higher temperature the higher loss of 14C from treated soil. Also the acidity of the media reduced the efficiency of 14C-recovery from the soil at 25 degrees C and 15 degrees C. In addition the obtained data illustrated that, the distribution and bioaccumulation ratio (BR) of radioactive material by fish was many times higher than that of algae and snail. Furthermore, BR of fish and snail proved to be pH depended. While BR of algae was generally higher in the light than in the dark. Finally it can be observed that, the total recovery of 14C-Lindane in the light was higher than in the dark at all conditions of the experiment. From the obtained data it can be concluded that, the amount of radioactive material recovered from soil or trapped as 14CO2 was to some extent pH dependent.
