六价铬对黄颡鱼仔鱼和稚鱼的急性毒性效应研究

The Acute Toxicity of Hexavalent Chromium on Pelteobagrus fulvidraco Fry and Fingerling

利用静水式鱼类急性毒性测试法,分别以黄颡鱼(Pelteobagrus fulvidraco)仔鱼和稚鱼为受试对象,通过六价铬的急性毒性试验,获得24、48、72、96 h相应的半数致死浓度LC50值,比较了六价铬对黄颡鱼仔鱼和稚鱼的致毒敏感性,计算了六价铬对黄颡鱼的安全质量浓度并对六价铬对于黄颡鱼急性毒性等级进行了评价。旨在通过开展我国本土水生生物的急性毒性效应的研究,获得相应的毒理学数据,为推导符合我国生态分区特点的水质基准提供基础信息。结果表明,在水温为(23±2)℃条件下,六价铬对黄颡鱼仔鱼24、48、72、96 h的半数致死浓度LC50分别为28.32、21.99、17.70、15.79 mg.L-1,而对黄颡鱼稚鱼24、48、72、96 h的LC50分别为138.5、88.36、68.55、57.98 mg.L-1,说明黄颡鱼仔鱼对于六价铬毒性的敏感性明显高于稚鱼。六价铬对黄颡鱼仔鱼和稚鱼的安全浓度分别为1.579、5.798 mg.L-1,依据急性毒性结果和鱼类急性毒性分级标准,六价铬对于黄颡鱼毒性等级属于中等毒性。

The acute toxicity of hexavalent chromium to fry and fingerling of Pelteobagrus fulvidraco,including 24 h LC50,48 h LC50,72 LC50 and 96 h LC50 values,was determined with the static test method in this study,the toxicity sensitivity of fry and fingerling was analyzed,the safety concentration of hexavalent chromium to Pelteobagrus fulvidraco was calculated and the fish acute virulence classification was evaluat-ed.The results showed that under the test condition of water temperature（23±2）℃,the 24 h LC50,48 h LC50,72 LC50 and 96 h LC50 values of hexavalent chromium to fry and fingerling of Pelteobagrus fulvidraco were 28.32,21.99,17.70,15.79 mg.L-1 and 138.5,88.36,68.55,57.98 mg.L-1,respectively.It indicated that the toxicity of Pelteobagrus fulvidraco fry was obviously higher than that of fingerling.The native aquat-ic toxicological data obtained from this study could be used to derive the water quality criteria for the protection of aquatic organisms.Based on these acute toxic values and the fish acute virulence classification standard,hexavalent chromium had the moderate toxicity to Pelteoba-grus fulvidraco.