摘要
研究了正常溶氧(5.5～6.0 mg/L)和过饱和溶氧(10～12 mg/L)条件下亚硝酸盐和氨氮对中国对虾的急性毒性效应。试验结果表明,正常溶氧条件下,亚硝酸盐对中国对虾的48 h LC_(50)值和96 h LC_(50)值(95%可信限)分别为69.43 mg/L(58.53～82.36 mg/L),43.80 mg/L(37.57～51.06 mg/L),非离子氨对中国对虾的48 h LC_(30)值和96h LC_(50)值(95%可信限)分别为1.36 mg/L(1.15～1.61 mg/L)和0.98 mg/L(0.83～1.16 mg/L);而过饱和溶氧条件下亚硝酸盐对中国对虾的48 h LC_(50)值和96 h LC_(50)值(95%可信限)分别为94.80 mg/L(79.77～112.66 mg/L),58.64 mg/L (51.40～66.90 mg/L);非离子氨对中国对虾的48 h LC_(50)值和96 h LC_(50)值(95%可信限)分别为2.37 mg/L(2.0j～2.75 mg/L)和1.52 mg/L(1.30～1.77 mg/L)。亚硝酸盐和非离子氨对中国对虾均具有一定的毒性,无论在正常溶氧还是过饱和溶氧条件下,非离子氨对中国对虾的毒性都大于亚硝酸盐,同时高溶氧的存在使中国对虾对这两种物质毒性耐受能力得以提高,且过饱和溶氧对非离子氨毒性的影响程度高于亚硝酸盐。
The acute toxic effects of nitrite and non-ion ammonia on Fenneropenaeus chinensis were studied at normal （5.5-6.0 mg/L） and hyperoxic （10-12 mg/L） dissolved oxygen levels. The results showed that the 48h and 96h median lethal concentrations （LC50） （95 % confidence limits） of nitrite for F. chinensis at normal oxygen level were 69. 43mg/L （58.53-82.36 mg/L） and 43.80 mg/L （37.57-51.06 mg/L）, respectively; and those of non-ion ammonia were 1.36 mg/L （1. 15-1. 61 mg/L） and 0. 98 mg/L （0.83-1. 16 rag/L）, respectively. However, under hyperoxic conditions, the 48h and 96h LC50 （95 % confidence limits） of nitrite for F. chinensis were 94. 80 mg/L （79. 77-112. 66 mg/L） and 58. 64 mg/L （51.40-66.90 mg/L）, respectively; and those of non-ion ammonia were 2.37 mg/L （2.05-2.75 mg/L） and 1.52 mg/L （1.30-1.77 mg/L）, respectively. Both nitrite and ammonia-nitrogen were found to be toxic to F. chinensis; yet the toxic effects of non-ion ammonia were more significant than that of nitrite, irrespective of oxygen levels. At the same time, F. chinensis could tolerate much higher concentrations of nitrite or non-ion ammonia under hyperoxic conditions; and compared to nitrite, the toxicity of non-ion ammonia was more easily alleviated by the hyperoxic conditions.
出处
《海洋水产研究》
CSCD
北大核心
2007年第6期1-6,共6页
Marine Fisheries Research
基金
国家科技支撑计划项目(2006BAD09A03)和国家883计划项目(2006AA100305)共同资助
关键词
亚硝酸盐
非离子氨
中国对虾
急性毒性
Nitrite Non-ion ammonia Fenneropenaeus chinensis Acute toxicity
