Norwood W P, Borgmann U, Dixon D G
Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
Environ Pollut. 2006 Oct;143(3):519-28. doi: 10.1016/j.envpol.2005.11.041. Epub 2006 Feb 7.
Bioaccumulation of As, Co, Cr and Mn by the benthic amphipod Hyalella azteca in Burlington City tap (Lake Ontario) water was measured in 4-week tests. Bioaccumulation increased with exposure concentration and demonstrated an excellent fit to a saturation model (r(2): 0.819, 0.838, 0.895 and 0.964 for As, Co, Cr and Mn, respectively). The proportion of total body Mn eliminated during a 24-h depuration period decreased as Mn body concentration increased, apparently due to a saturation of the elimination rate. The high maximum body concentration of 116,000 nmol g(-1) appears to result from the saturation of the Mn excretion which is slightly greater than the maximum Mn uptake rate. Elimination rates for As, Co and Cr were not dependent on body concentration. The four elements were not physiologically regulated in Hyalella. Their body concentrations should be good indicators of bioavailability and useful for environmental assessment.
在为期4周的测试中，测定了底栖双足类动物阿兹特克透明溞在伯灵顿市自来水（安大略湖）中对砷、钴、铬和锰的生物累积情况。生物累积量随暴露浓度的增加而增加，并且与饱和模型拟合良好（砷、钴、铬和锰的r²分别为0.819、0.838、0.895和0.964）。在24小时的净化期内，随着体内锰浓度的增加，体内总锰消除的比例下降，这显然是由于消除率饱和所致。高达116,000 nmol g(-1)的最大体内浓度似乎是由于锰排泄的饱和导致的，其略大于最大锰摄取率。砷、钴和铬的消除率不依赖于体内浓度。这四种元素在阿兹特克透明溞中不受生理调节。它们的体内浓度应该是生物可利用性的良好指标，并且对环境评估有用。
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