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《Chemical Journal of Chinese Universities》 2015-07
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Investigation on the Factors Affecting Hydrogen Peroxide Concentrations in Natural Biofilm Systems

DONG Deming;SUN Jiaqian;ZHAO Tianyu;LI Ming;HUA Xiuyi;LIANG Dapeng;GUO Zhiyong;Key Lab of Groundwater Resources and Environment of Ministry of Education,Key Lab of Water Resources and Aquatic Environment of Jilin Province,College of Environment and Resources,Jilin University;  
In this study,hydrogen peroxide( H2O2) was selected as a representative of reactive oxygen species( ROS) to investigate the effect of factors,such as light / dark variation,dark pretreatment of biofilms,biofilm quantity,presence of ligands and p H value of the solutions,on H2O2 concentrations in natural biofilmswater systems. The results indicated that H2O2 concentration increased rapidly under illumination,and the H2O2 concentration decreased( to about 2 / 3) when the systems switched to darkness. Dark pretreatment significantly reduced both the H2O2 concentrations and the increasing rate. The increase and decrease of biofilm quantity led to corresponding change of H2O2 concentrations in the systems. The presence of organic ligands reduced the H2O2concentrations( by about 1 / 2—1 / 3). H2O2 concentrations in neutral and acidic systems( p H= 7 and 5) were about 1. 5 times as high as that in basic system( p H = 9). These factors affected H2O2 concentrations in the biofilm systems by affecting three key processes,which were H2O2 generation of natural biofilms,H2O2 decomposition and H2O2 removal by biofilms.
【Fund】: 国家自然科学基金(批准号:21277056);; 国家“水体污染控制与治理”科技重大专项项目(批准号:2012ZX07202009)资助~~
【CateGory Index】: TQ123
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