Gimbert Frédéric, Mench Michel, Coeurdassier Michaël, Badot Pierre-Marie, de Vaufleury Annette
University of Franche-Comté, Department of Environmental Biology, EA 3184 MR UsC INRA, Place Leclerc, 25030 Besançon Cedex, France.
Environ Pollut. 2008 Apr;152(3):736-45. doi: 10.1016/j.envpol.2007.06.044. Epub 2007 Aug 13.
The proper use of bioaccumulation in the assessment of environmental quality involves accounting for chemical fluxes in organisms. Cadmium (Cd) accumulation kinetics in a soil-plant-snail food chain were therefore investigated in the field under different soil contamination (from 0 to 40 mg kg(-1)), soil pH (6 and 7) and season. Allowing for an accurate and sensitive assessment of Cd transfer to snails, toxicokinetics appears an interesting tool in the improvement of risk assessment procedures and a way to quantify metal bioavailability for a defined target. On the basis of uptake fluxes, snails proved to be sensitive enough to distinguish moderate soil contaminations. The soil pH did not appear, in the range studied, as a modulating parameter of the Cd transfer from soil to snail whereas the season, by influencing the snail mass, may modify the internal concentrations. The present data specifying a time integrated assessment of environmental factors on metal bioavailability and transfer to terrestrial snails should ensure their rational use in environmental biomonitoring.
在环境质量评估中正确使用生物累积涉及考虑生物体中的化学通量。因此，在田间研究了不同土壤污染（0至40 mg kg(-1)）、土壤pH值（6和7）和季节条件下土壤-植物-蜗牛食物链中镉（Cd）的累积动力学。考虑到对Cd向蜗牛转移进行准确和灵敏的评估，毒理学动力学似乎是改进风险评估程序的一个有趣工具，也是量化特定目标金属生物有效性的一种方法。基于吸收通量，蜗牛被证明足够敏感，能够区分中等程度的土壤污染。在所研究的范围内，土壤pH值似乎不是Cd从土壤向蜗牛转移的调节参数，而季节通过影响蜗牛体重，可能会改变其体内浓度。目前关于环境因素对金属生物有效性及向陆地蜗牛转移的时间综合评估数据，应能确保其在环境生物监测中的合理应用。
