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《Environmental Science & Technology》 2017-01
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Influence of Relative Humidity on Real-Time Measurement of Indoor PM_(2.5) Concentration

KUANG Cailing;SHANG Min;CUI Hairui;XIAO Daqiao;ZHENG Xiang;CHENG Rong;School of Environment and Natural Resources, Renmin University of China;  
This paper described a laboratory experiment for investigating the impact of relative humidity on concentration of indoor PM_(2.5),which was measured by the laser dust monitor,evaluating the pollution condition of indoor PM_(2.5) truly and objectively.The experiment was carried out with an environmental chamber,in which deionized water,NaCl solution,CaCl_2solution,and E.coli solution were used for the experiment,and the changes of relative humidity and PM_(2.5) at the same time were recorded in the process of humidification to probe into the relationship between the PM_(2.5) real-time measurement value and relative humidity at room temperature.The experiment revealed that rapid humidity changes during the humidification process could greatly affect the PM_(2.5) real-time measurement value;the greater the initial PM_(2.5) concentration was,the more sensitive the interference of relative humidity to the PM_(2.5) real time measurement would be,e.g.when the initial concentration of PM_(2.5) was 500 μg/m~3 the relative humidity of the sensitive change point of real-time measurement value was 60%.Furthermore,the higher the concentration of impurities in water was,the greater the PM_(2.5) real time measurement would be,salt ions and microorganisms,etc in water would greatly increase the scattering effect of droplets on the laser,e.g.when the concentration of NaCl solution was 250 mg/L,and the PM_(2.5) real time measurement more than 1 000 μg/m~3,the corresponding relative humidity was only 36%.
【Fund】: 中国人民大学科学研究基金(中央高校基本科研业务费专项资金资助)项目成果(10XNJ023 15XNLD04)
【CateGory Index】: X831
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