A field investigation into the characteristics and formation mechanisms of particles during the operation of laser printers and photocopiers  

作　　者：Qiang Wang Daizhi An Zhengquan Yuan Rubao Sun Wei Lu Lili Wang 

机构地区：[1]Chinese People’s Liberation Army Center for Disease Control and Prevention,Beijing 100071,China

出　　处：《Journal of Environmental Sciences》2023年第4期697-707,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.81973003);the Army Logistics Research Plan of China (No.AEP14C001)。

摘　　要：Indoor particle release from toner printing equipment (TPE) is a major health concern and has received wide attention.In this study,nine printing centers were randomly selected and three working phases were simulated,namely,non-working,normal printing/copying,and heavy printing/copying.The dynamics of the ozone (O_(3)),volatile organic compound (VOC),and particle emissions from TPE were determined by portable detectors.Results showed that particles,VOCs,and O_(3)were indeed discharged,and particles and VOCs concentrations remained at high levels.Among them,44%of the rooms represented high-level particle releases.Submicrometer-sized particles,especially nanoparticles,were positively correlated with VOCs,but were inversely proportional to the O_(3)concentration.Four elements,Ca,Al,Mg and Ni,were usually present in nanoparticles because of the discharge of paper.Si,Al,K,Ni and Pb were found in the submicrometer-sized particles and were consistent with the toner composition.The potential particle precursors were identified,which suggested that styrene was the most likely secondary organic aerosol (SOA) precursor.Overall,the use of the toner formulation and the discharge of paper attribute to the TPE-emitted particles,in which styrene is a specific monitoring indicator for the formation of SOA.

关 键 词：Toner-based printing equipment Particulate matter OZONE Volatile organic compound Secondary organic aerosol precursor 

分 类 号：TP334.84[自动化与计算机技术—计算机系统结构] X51[自动化与计算机技术—计算机科学与技术] TU834.8[环境科学与工程—环境工程]