Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Chemosphere. 2010 Aug;80(9):1031-5. doi: 10.1016/j.chemosphere.2010.05.030. Epub 2010 Jun 14.
The biological toxicity of lanthanides on marine monocellular algae was investigated. The specific objective of this research was to establish the relationship between the abundance in the seawater of lanthanides and their biological toxicities on marine monocellular algae. The results showed that all single lanthanides had similar toxic effects on Skeletonema costatum. High concentrations of lanthanides (29.04+/-0.61 micromol L(-1)) resulted in 50% reduction in growth of algae compared to the controls (0 micromol L(-1)) after 96 h (96 h-EC50). The biological toxicity of 13 lanthanides on marine monocellular algae was unrelated with the abundance of different lanthanide elements in nature, and the "Harkins rule" was not appropriate for the lanthanides. A mixed solution that contained equivalent concentrations of each lanthanide element had the same inhibition effect on algae cells as each individual lanthanide element at the same total concentration. This phenomenon is unique compared to the groups of other elements in the periodic table. Hence, we speculate that the monocellular organisms might not be able to sufficiently differentiate between the almost chemically identical lanthanide elements.
研究了镧系元素对海洋单细胞藻类的生物毒性。本研究的具体目的是建立海水中镧系元素丰度与其对海洋单细胞藻类生物毒性之间的关系。结果表明，所有单一的镧系元素对中肋骨条藻都有相似的毒性作用。在 96 小时（96 h-EC50）后，高浓度的镧系元素（29.04+/-0.61 微摩尔/升）导致藻类生长减少 50%，而对照（0 微摩尔/升）。海洋单细胞藻类对 13 种镧系元素的生物毒性与自然界中不同镧系元素的丰度无关，“哈金斯规则”不适用于镧系元素。在相同的总浓度下，含有各镧系元素当量浓度的混合溶液对藻类细胞的抑制作用与单一镧系元素相同。与周期表中其他元素组相比，这种现象是独特的。因此，我们推测单细胞生物可能无法充分区分几乎化学性质相同的镧系元素。
