کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4426157 | 1309120 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Uranium uptake and depuration in the aquatic invertebrate Chironomus tentans Uranium uptake and depuration in the aquatic invertebrate Chironomus tentans](/preview/png/4426157.png)
Evaluation of aqueous uranium (U) uptake and depuration in larvae of the midge Chironomus tentans were investigated in two separated experiments. First, a static-renewal experiment was performed with 10-d old C. tentans larvae exposed to 300 μg U/L. The animals steadily accumulated U (Ku = 20.3) approaching steady-state conditions (BAF = 56) in approximately 9–11 d. However, accumulated U was readily depurated (Kd = 0.36) with U tissue concentration decreasing rapidly within 3 d of the larvae being placed in clean water (t1/2 = 1.9 d). Also, the growth of C. tentans larvae appeared to decrease after 6–11 d of U exposure, probably due to the reallocation of resources into U detoxification mechanisms. However, growth significantly increased once C. tentans were transferred to clean water. A separate short-term experiment was performed to evaluate the possible mechanism of U uptake in this invertebrate. Results suggested a passive mechanism of U uptake coupled with an active mechanism of U depuration but no details related to the type of mechanisms or pathway was investigated.
Journal: Environmental Pollution - Volume 158, Issue 5, May 2010, Pages 1696–1701