首页|Analysis on influencing factors of detecting chemical oxygen demand in water by ultraviolet absorption spec-troscopy
Analysis on influencing factors of detecting chemical oxygen demand in water by ultraviolet absorption spec-troscopy
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Taking the standard solution and actual water samples as the research object,this paper studies the influence of various environmental factors(temperature,alkalinity(pH),inorganic salt ions and salinity)on the detection of chemical oxy-gen demand(COD)in water by ultra-violet(UV)spectrometry,analyzes the influence mechanism,and draws relevant conclusions.The results show that the UV absorbance of the COD standard solution and the actual river water samples varies very little with temperature.The value of pH has certain impact on both the standard solution and the actual water samples,but the pH values of the affected experimental samples are in different ranges.The effects of nitrogen salt ions(NO2-and NO3-)on the UV absorption spectra can be eliminated by intercepting the UV spectrum interval less affected for modeling.The influence of salinity values below 35％o on the UV absorption spectrum of water is mainly concentrated in the spectral band of 200-250 nm,and the influence above 250 nm is very little.This paper provides a preliminary analysis and discussion on the influence mechanism and laws of various environmental factors in the detection of water quality parameters by UV spectrometry,which provides an experimental basis for selecting the optimal test conditions when establishing the COD prediction model.
College of Information Engineering,Jingzhou University(College of Engineering and Technology Yangtze Univer-sity),Jingzhou 434000,China
Alxa League Meteorological Bureau,Alxa 750300,China
国家自然科学基金Scientific Research Projects of Colleges and Universities in Inner Mongolia Autonomous RegionBasic Scientific Research Foundation of Universities Directly under Inner Mongolia Autonomous Region
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