[Joint inhibition of benzene and monosubstituted benzenes on ammonia-oxidizing activity of sediment].
The joint inhibitions of benzene and three kinds of monosubstituted benzenes (aniline, phenol and nitrobenzene) on ammonia-oxidizing activity of sediment was investigated in order to study the effects of combined pollutants on nitrification process in the nitrogen cycle. The results showed that the joint inhibiton of 11 different kinds of mixtures, including binary or multi-equitoxic mixtures among benzene, aniline, phenol and nitrobenzene, exhibited different effects on ammonia-oxidizing activity of sediment, among which seven were addictive effect, three were synergistic, and only the mixture of benzene and phenol was antagonism. A conclusion could be made that the addition of nitrobenze to a mixture usually exhibited addictive effect. There was a relationship between the half joint inhibition concentrations (IC50, micromol x L(-1)) of benzene and monosubstituted benzenes on ammonia-oxidizing activity of sediment and the mixed electronegativities (MEs): lgIC50 = 2.197 - 0.236ME. With the increase of mixed electronegativities (MEs), the joint inhibitions of mixtures increased.
Environment Simulation and Pollution Control State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Chun-hong
CH
Dong
Hong-ying
HY
Hu
Dong-bin
DB
Wei
Xia
X
Huang
Yi
Y
Qian
D000641:Ammonia / Q000737:chemistry*; D000814:Aniline Compounds / Q000737:chemistry / Q000378:metabolism; D001554:Benzene / Q000737:chemistry* / Q000378:metabolism; D001555:Benzene Derivatives / Q000737:chemistry* / Q000378:metabolism; D041841:Bradyrhizobiaceae / Q000378:metabolism*; D009578:Nitrobenzenes / Q000737:chemistry / Q000378:metabolism; D010084:Oxidation-Reduction; D019800:Phenol / Q000737:chemistry / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D000814:Aniline Compounds; D001555:Benzene Derivatives; D009578:Nitrobenzenes; D014874:Water Pollutants, Chemical; D019800:Phenol; D000641:Ammonia; C036077:nitrobenzene; D001554:Benzene; C023650:aniline