title: [Inhibition of aromatics on ammonia-oxidizing activity of sediment].
abstract: The inhibition of 24 aromatics on ammonia-oxidizing activity of nitrifying bacteria in sediment was measured. The effects of the kind, number and position of substituted groups on ammonia-oxidizing activity of nitrifying bacteria were discussed. The inhibition of mono-substituted benzenes on ammonia-oxidizing activity of nitrifying bacteria were in order of -OH > -NO2 > -NH2 > -Cl > -CH3 > -H. The position of substituted groups of di-substituted benzenes also affected the inhibition, and the inhibitions of dimethylbenzenes(xylene) were in order of meta-> ortho-> para-. The increase in number of substituted group on benzene-ring enhanced the inhibition of aromatics studied in this study on nitrifying bacteria. There was a linear relationship between inhibition (IC50, mumol.L-1) of aromatics on ammonia-oxidizing activity and total electronegativity (sigma E) of aromatics: lgIC50 = 14.72 - 0.91 sigma E.
authors.affiliation: Environment Simulation and Pollution Control State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Chun-hong
authors.initials: CH
authors.lastname: Dong
authors.forename: Hong-ying
authors.initials: HY
authors.lastname: Hu
authors.forename: Dong-bin
authors.initials: DB
authors.lastname: Wei
authors.forename: Xia
authors.initials: X
authors.lastname: Huang
authors.forename: Yi
authors.initials: Y
authors.lastname: Qian
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D001555:Benzene Derivatives / Q000494:pharmacology*; D019015:Geologic Sediments; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship
chemical_list: D001555:Benzene Derivatives; D000641:Ammonia