摘要
本文利用化学平衡模式MINTEQA2研究不同酸度、碱度和有机配体存在下铜的形态分布特点,通过Daphnia magna毒性试验获得形态变化时的毒性变化规律.结果显示:无论是总量(无机形态总量),还是游离态浓度,都不能反映出铜的毒性大小.为此我们提出用活性态浓度来表征铜的毒性大小,较好地解释了不同体系中铜的毒性变化规律.
The influences of pH, alkalinity, and EDTA on speciation of copper was modeled with MINTEQA2 software. The influence of copper speciation on toxicity was assayed by Daphnia magna test. The results show that toxicity of copper was attributed to Cu2+,CuOH+,and Cu (OH)2 (aq) ,not to Cu (CO3)2,CuHCO3,and CuEDTA complex. The results from different treatments can be explained by an empirical expression TP= 4.05 + 2. 86 Ig[Cu* ],where TP is toxic probity and [Cu* ] is defined as 'active copper species' ([Cu*]=[Cu2+]+0.75[CuOH+]+0.70[Cu(OH)2(aq)]).
出处
《环境化学》
CAS
CSCD
北大核心
1998年第1期14-18,共5页
Environmental Chemistry