Uranium uptake and depuration in the aquatic invertebrate Chironomus tentans

作者：Muscatello Jorgelina R^*; Liber Karsten

来源：Environmental Pollution, 2010, 158(5): 1696-1701.

DOI：10.1016/j.envpol.2009.11.032

• Uranium
• Uranium uptake
• Uranium depuration
• Chironomus tentans

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 mu g U/L The animals steadily accumulated U (K-u = 20.3) approaching steady-state conditions (BAF = 56) in approximately 9-11 d. However, accumulated U was readily depurated (K-d = 0.36) with U tissue concentration decreasing rapidly within 3 d of the larvae being placed in clean water (t(1/2) = 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 ten tans 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 deputation but no details related to the type of mechanisms or pathway was investigated.

• 出版日期2010-5