Sandifer R D, Hopkin S P
Ecotoxicology Group, School of Animal and Microbial Sciences, University of Reading.
Chemosphere. 1996 Dec;33(12):2475-86. doi: 10.1016/s0045-6535(96)00348-7.
EC50s for cadmium, copper, lead and zinc were determined for juvenile production of Folsomia candida at pH6.0, 5.0 and 4.5 in a standard laboratory test system. In contrast to most previous studies where metal toxicity was increased at low pHs, in our experiments there was no clear relationship between soil acidity and EC50-reproduction in this species. The EC50-reproduction values (microgram g-1) for cadmium and zinc were similar at all three pHs (pH6.0: Cd 590, Zn 900; pH5.0: Cd 780, Zn 600; pH4.5: Cd 480, Zn 590). In contaminated field sites adjacent to primary zinc smelters, zinc is invariably present in soils at concentrations of at least 50 times that of cadmium. Thus deleterious effects of mixtures of these metals on populations of Collembola in such sites can be attributed to zinc rather than cadmium.
在标准实验室测试系统中，于pH值6.0、5.0和4.5的条件下，测定了镉、铜、铅和锌对白色符氏跳虫幼体生长的半数效应浓度（EC50）。与之前大多数研究中低pH值下金属毒性增加的情况相反，在我们的实验中，该物种的土壤酸度与EC50-繁殖之间没有明显关系。镉和锌的EC50-繁殖值（微克 g-1）在所有三个pH值下都相似（pH6.0：镉590，锌900；pH5.0：镉780，锌600；pH4.5：镉480，锌590）。在靠近初级锌冶炼厂的受污染现场，土壤中锌的含量始终至少是镉的50倍。因此，这些金属混合物对这些地点弹尾目昆虫种群的有害影响可归因于锌而非镉。
