摘要
[目的]探索重金属在不同水温条件下对双壳贝类的毒性效应。[方法]采用静态急性毒性试验的方法研究了在21、25和29℃条件下水体中不同浓度的Hg2+、Cd2+及Zn2+对三角帆蚌幼蚌存活的影响。[结果]在3种水温条件下,3种重金属离子对三角帆蚌幼蚌的毒性大小依次为:Hg2+>Cd2+>Zn2+。水温在21、25和29℃条件下,3种重金属对三角帆蚌幼蚌的96 h半致死浓度(LC50)分别为:Hg2+分别是3.4359、0.1292和0.1087 mg/L;Cd2+分别是6.3459、1.0037和0.3879 mg/L;Zn2+分别是116.9288、4.9515和2.8497mg/L。当水温从21℃升至25℃时,Hg2+、Cd2+和Zn2+对幼蚌的毒性分别增强了26.6、6.3和23.6倍;水温从25℃升至29℃时,Hg2+、Cd2+和Zn2+的毒性分别增强了1.2、2.6和1.7倍。[结论]水温是重金属急性毒性效应的影响因素,随着温度的升高,重金属的毒性逐渐增强。
[ Objective ] The study aimed to explore the toxic effect of heavy metals on the mussel under different water temperature. [ Method ] Effects of Hg^2＋ , Cd^2＋ and Zn^2＋ with different concn, on the survival of Hyriopsis cumingii juveniles after exposure to individual metal were studied under water temperature of 21, 25 and 29℃ by static acute toxicity test. [ Result] Under 3 kinds of water temperatures, the toxicant degree of 3 kinds of heavy metals to H. cumingii juveniles in order was Hg^2＋ 〉 Cd^2＋ 〉 Zn^2＋ . Under water temperature of 21, 25 and 29 ℃, the 96 h LC5o of the 3 kinds of heavy metal ions to H. cumingii juveniles were as follows： Hg^2＋ was 3.4359, 0. 129 2 and 0. 108 7 mg,/L resp. Cd^2＋ was 6. 3459, 1. 003 7 and 0. 387 9 mg/L resp. Zn^2＋ was 116. 928 8, 4. 951 5 and 2. 849 7 mg/L. The toxicity of Hg^2＋ , Cd^2＋ and Zn^2＋ to the juveniles enhanced 26.6, 6.3 and 23.6 times resp. when the water temperature rose from 21 ℃ to 25 ℃, while those enhanced 1.2, 2.6 and 1.7 times resp. when the water temperature rose from 25 ℃ to 29℃. [ Conclusion] The temperature was an important factor to influence the acute toxicity of heavy metals. The toxicity of heavy metals was increasesed gradually as the water temperature rose.
出处
《安徽农业科学》
CAS
北大核心
2009年第14期6468-6471,共4页
Journal of Anhui Agricultural Sciences
基金
浙江省重大科技专项项目(2007C12028 )。
