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.

ZHOU Kunpeng;LIU Zhiyang;CONG Menglong;MAN Shanxin

Intelligent Manufacturing Technology Key Laboratory,Intelligent Agricultural Machinery Equipment&Technol-ogy Team,College of Engineering,Inner Mongolia Minzu University,Tongliao 028000,China;College of Information Engineering,Jingzhou University(College of Engineering and Technology Yangtze Univer-sity),Jingzhou 434000,China;Alxa League Meteorological Bureau,Alxa 750300,China

光电子快报（英文版）

[1]ZHOU Kunpeng;LIU Zhiyang;CONG Menglong;MAN Shanxin-.Analysis on influencing factors of detecting chemical oxygen demand in water by ultraviolet absorption spec-troscopy)[J].光电子快报（英文版）,2022(12):749-754

Analysis,influencing,factors,detecting,chemical,oxygen,demand,water,by,ultraviolet,absorption,troscopy,Taking,standard,solution,actual,samples,research,object,this,paper,studies,influence,various,environmental,temperature,alkalinity,inorganic,salt,salinity,detection,COD,UV,spectrometry,analyzes,mechanism,draws,relevant,conclusions,results,show,that,absorbance,river,varies,very,little,has,certain,impact,both,but,values,affected,experimental,are,different,ranges,effects,nitrogen,NO2,NO3,can,eliminated,intercepting,spectrum,interval,less,modeling,below,mainly,concentrated,spectral,band,above,This,provides,preliminary,analysis,discussion,laws,quality,parameters,which,basis,selecting,optimal,test,conditions,when,establishing,prediction

0.501574