Irstea, UR HBAN - Ecotoxicology, 1 rue Pierre-Gilles de Gennes, CS 10030, F-92761 Antony Cedex, France; FIRE FR-3020, 4 place Jussieu, 75005 Paris, France.
Irstea, UR HBAN - Ecotoxicology, 1 rue Pierre-Gilles de Gennes, CS 10030, F-92761 Antony Cedex, France.
Environ Pollut. 2015 Aug;203:22-30. doi: 10.1016/j.envpol.2015.03.045. Epub 2015 Apr 4.
Metals bioaccumulated in aquatic organisms are considered to be a good indicator of bioavailable metal contamination levels in freshwaters. However, bioaccumulation depends on the metal, the species, and the water chemistry that influences metal bioavailability. In the laboratory, a kinetic model was used to describe waterborne Pb bioaccumulated in Gammarus pulex. Uptake and elimination rate constants were successfully determined and the effect of Ca(2+) on Pb uptake was integrated into the model. Thereafter, accumulated Pb concentrations in organisms were predicted with the model and compared with those measured in native populations from the Seine watershed (France). The predictions had a good agreement with the bioaccumulation levels observed in native gammarids and particularly when the effect of calcium was considered. To conclude, kinetic parameters experimentally derived for Pb in G. pulex are applicable in environmental conditions. Moreover, the consideration of the water's chemistry is crucial for a reliable interpretation of bioaccumulation.
金属在水生生物体内的积累被认为是淡水生物可利用金属污染水平的良好指标。然而，生物积累取决于金属、物种以及影响金属生物利用度的水化学。在实验室中，使用动力学模型来描述在大型蚤中积累的水铅。成功确定了吸收和消除速率常数，并将钙对铅吸收的影响纳入模型中。此后，使用该模型预测了生物体内积累的铅浓度，并将其与来自塞纳河流域（法国）的本地种群中测量的浓度进行了比较。预测结果与在本地大型蚤中观察到的生物积累水平非常吻合，尤其是在考虑钙的影响时。总之，在大型蚤中实验得出的铅动力学参数适用于环境条件。此外，对水化学的考虑对于可靠解释生物积累至关重要。
