Cr^(6+)、Cd^(2+)对荔枝螺的急性毒性效应  

The Acute Toxicity of Cr^(6+)/Cd^(2+) to Snail Thais clavigera

作　　者：谢佳彦[1] 朱爱意[1] 

机构地区：[1]浙江海洋学院,国家海洋设施养殖工程技术研究中心,浙江舟山316004

出　　处：《水产科学》2014年第5期301-305,共5页Fisheries Science

基　　金：浙江省重点科技创新团队项目(2010R5002)

摘　　要：为探求Cr6+、Cd2+对荔枝螺的急性毒性危害,研究了Cr6+和Cd2+在不同质量浓度及温度条件下对荔枝螺24、48、72、96h的急性毒性效应,采用原子吸收光谱法测定荔枝螺内脏团与腹足肌肉对Cr6+和Cd2+的蓄积能力。试验结果表明,Cr6+和Cd2+对荔枝螺属低、中毒物质。Cr6+和Cd2+安全质量浓度分别为7.94mg/L和0.74mg/L,Cd2+对荔枝螺的毒性比Cr6+约大10倍。高于渔业水质标准值(Cr6+≤0.1mg/L,Cd2+≤0.005mg/L),Cr6+约高79倍,Cd2+高148倍,毒性强弱结果为Cd2+>Cr6+;一定范围内,温度升高,Cr6+和Cd2+对荔枝螺的单位时间致死率和致死速率会增大;在一定温度范围内,荔枝螺对Cr6+和Cd2+的吸收量随温度升高而升高,温度升高可促进荔枝螺对Cr6+、Cd2+的吸收;温度对荔枝螺蓄积Cr6+的能力影响较大,而对Cd2+蓄积的能力影响较小。Cr6+的蓄积因温度而变动,而Cd2+在不同温度下都能被稳定的吸收蓄积。内脏是蓄积两种重金属的主要部位,蓄积能力高于肌肉。The acute toxicity of Cr6＋ /Cd2＋ to snail Thais clavigera was studied in 24 ,48 ,72 and 96 h at varied temperature and densities ,and the accumulation of Cr6＋ /Cd2＋ was analyzed in the viscera and feet of the snail by atomic absorption spectroscopy .The results showed that Cr6＋ was found low‐toxic and Cd2＋ mid‐toxic to the snail ,Cd2＋ being more toxic than Cr6＋ ,with safe concentration of 7 .94 mg/L in Cr6＋ and 0 .74 mg/L in Cd2＋ ,10 times higher toxicity in Cd2＋ than in Cr6＋and much more higher than the fishery water quality standard （Cr6＋ ≤0 .1 mg/L ;Cd2＋ ≤ 0 .005 mg/L） ,and as high 79 times for Cr6＋ as the standard and 148 times for Cd2＋ as the standard .The higher mortality and more rapid death were observed at higher temperature in the snail by Cr6＋ and Cd2＋ in an interval within certain range . Absorption of Cr6＋ and Cd2＋ by the snail was found to be increased with rising temperature within given ranges .Temperature led to higher accumulation of Cr6＋ than the accumulation of Cd2＋ .There was more accumulation of heavy metals in the viscera than in foot muscle .The accumulation of Cr6＋ was varried with temperature ,while the Cd2＋ was constantly absorbed .

关 键 词：荔枝螺 Cr6+ Cd2+ 急性毒性 

分 类 号：S968.31[农业科学—水产养殖]