铜与腐殖酸对小球藻生长影响的研究

EFFECTS OF COPPER AND FULVIC ACID ON THE GROWTH OF GREEN ALGAE

本文在静态实验条件下,研究了铜-富里酸-藻体系中铜对小球藻的毒性效应及描述毒性效应的定量模型。无富里酸存在时,0.55mg/l的铜可抑制小球藻生长率的50％,当铜浓度为4.3mg/l时,小球藻仍有微弱的生长。水生富里酸对小球藻既有保护作用,又有刺激作用且富里酸太多时抑制小球藻生长。在铜和富里酸对藻类生长的综合影响模型中,小球藻的生长率与铜浓度关系为累积对数正态分布曲线,富里酸对小球藻的刺激作用为负指数曲线关系,富里酸与铜的络合作用可用单配位基络合模型表述,用上述三者的综合模型预测不同富里酸、铜浓度时小球藻的生长率与实测值吻合较好。

The toxic effect of copper on the growth rate of green algae, Chlorella vulgaris, in copper-fulvic acid-algae system was studied. It was shown that copper of 0.55mg L-1 caused a 50% decrease in the growth rate of algae in the medium without fulvic acid and the addition of fulvic acid inhibited the tixic effect of copper. The relationship among the algae growth rate and the concentrations of copper and fulvic acid was quantitatively described using an integrated equation combining cumulative normal distribution curve for the growth,the negative expontial curve for stimulation and the single ligand binding model for the complexation effect. The calculated growth rates of algae at various concentiations of copper and fulvic acid using the model agreed well with the experimental results.