在不同水硬度下铜对草鱼、鲢和大鳞泥鳅的急性毒性

ACUTE TOXICITY OF COPPER TO THE GRASS CARP,SILVER CARP AND LOACH UNDER DIFFERENT WATER HARDNESS

实验以草鱼、鲢和大鳞泥鳅的鱼苗为材料,测定了水硬度对铜的急性毒性的影响,水硬度在255、141、37和14mg/L(以 CaCO_3计)时铜对草鱼的48小时 LC_(50)分别是519、354、91和76μg/L,96小时 LC_(50)则分别为460、307、67和39μg/L.在同样的硬度条件下,对鲢的48小时 LC_(50)是452、393、71和40μg/L,96小时 LC_(50)分别为452、296、41和31μg/L.大鲢泥鳅鱼苗在硬度260、137、36和10μg/L(以 CaCO_3计)条件下,铜的48小时 LC_(50)为369、305、1113和67μg/L,而96小时 LC_(50)则分别是226、135、67和18μg/L.铜的急性毒性和水硬度之间的关系可用下列方程来描述:草鱼 ln96小时■_(50)=1.1345+0.9051ln 硬度 r=0.99ln96小时■_(50)=2.2118+0.7220ln 硬度 r=0.97鲢 ln96小时■_(50)=0.4564+1.0207ln 硬度 r=0.97ln96小时■_(50)=1.1371+0.9232ln 硬度 r=0.98大鳞泥鳅ln96小时■_(50)=1.2823+0.7506ln 硬度 r=0.99ln96小时■_(50)=2.8635+0.5563ln 硬度 r=0.

This experiment was designed to determine the effect of water hardness on the acute toxicity of copper for fry of grass carp(Ctenopharyngodon idellus),silver carp(Hypophthalnichtys molitrix)and loach (Misgournus mizolepis).At a total hardness of 255,141,37and14mg/L as CaCO_3 for the grass carp fry 48-hour LC_(50) of copper was 519,354,91,76μg/L,and 96-hour Lc_(50) was 460,307,67,39μg/L,resp- ectively.For silver carp fry under the same conditions the 48-hour LC_(50) was 452,393,71,40μg/L, and 96-hour LC_(50) was 452,296,41,31μg/L,respectively.For loach fry the 48-hour LC_(50) was 369,305,113 and 67μg/Lin water having a total hardness of 260,137,36 and 10mg/Las CaCO_3, and 96-hour LC_(50) was 226,135,67 and 18μg/L respectively.The relations between the acute toxicity of copper and the hardness of the water can be described by grass carp:ln:96hr ■_(50)=1.1435+0.9051 ln H r=0.99 ln:48hr■_(50)=2.2118+0.7220 ln H r=0.97 silver carp:ln:96hr■_(50)=0.4564+1.0207 ln H r=0.97 ln:48hr■_(50)=1.1371+0.9232 ln H r=0.98 loach:ln:96hr■_(50)=1.2823+0.7506 ln H r=0.99 ln:48hr■_(50)=2.8635+0.5563 ln H r=0.99