硝基苯及其主要降解中间产物对发光菌联合急性毒性的影响

研究了硝基苯及其主要降解中间产物邻硝基苯酚、间硝基苯酚和对硝基苯酚对明亮发光杆菌的单一毒性及多元混合联合毒性的影响.采用毒性单位法（TU）、加和指数法（AI）以及混合毒性指数法（MTI）进行了评价.实验结果表明，硝基苯、邻硝基苯酚、间硝基苯酚和对硝基苯酚半致死浓度的-log EC50值分别为3.21、3.40、3.30和4.15.这4种有机物二元、三元和四元混合溶液的生物毒性主要表现为部分相加或协同作用.

Joint Toxicity of Nitrobenzene and Intermediate Products to Photobacterium Phosphoreum

There were many intermediate products in the process of nitrobenzene wastewater pretreatment. Some of the intermediate products were more toxic than nitrobenzene, which had bad effect on the microbe in biological treatment. So the toxicity assessment was necessary. The single toxicity and joint toxicity of nitrobenzene and its primary intermediate products (o nitrophenol, m nitrophenol and p nitrophenol) in wastewater were studied by using the method of photobacterum phosphoreum in this paper. The joint toxicity of multiple mixtures was evaluated by three evaluation methodology: Toxic Unit (TU), Additive Index(AI) and Mixture Toxicity Index(MTI). The results suggest that the -log EC50 value of the single toxicity for nitrobenzene, o nitrophenol, m nitrophenol and p nitrophenol is 3.21, 3.40, 3.30 and 4.15, respectively. The joint toxicity of multiple mixtures is primary additive action or synergistic action.