Measurements of fine and ultrafine particles formation in photocopy centers in Taiwan

Abstract This study investigates the levels of particulate matter smaller than 2.5 μm (PM 2.5 ) and some selected volatile organic compounds (VOCs) at 12 photocopy centers in Taiwan from November 2004 to June 2005. The results of BTEXS (benzene, toluene, ethylbenzene, xylenes and styrene) measurements indicated that toluene had the highest concentration in all photocopy centers, while the concentration of the other four compounds varied among the 12 photocopy centers. The average background-corrected eight-hour PM 2.5 in the 12 photocopy centers ranged from 10 to 83 μg m −3 with an average of 40 μg m −3 . The 24-h indoor PM 2.5 at the photocopy centers was estimated and at two photocopy centers exceeded 100 μg m −3 , the 24-h indoor PM 2.5 guideline recommended by the Taiwan EPA. The ozone level and particle size distribution at another photocopy center were monitored and indicated that the ozone level increased when the photocopying started and the average ozone level at some photocopy centers during business hour may exceed the value (50 ppb) recommended by the Taiwan EPA. The particle size distribution monitored during photocopying indicated that the emitted particles were much smaller than the original toner powders. Additionally, the number concentration of particles that were smaller than 0.5 μm was found to increase during the first hour of photocopying and it increased as the particle size decreased. The ultrafine particle (UFP, −3 during photocopying. The decline of UFP concentration was observed after the first hour and the decline is likely attributable to the surface deposition of charged particles, which are charged primarily by the diffusion charging of corona devices in the photocopier. This study concludes that ozone and UFP concentrations in photocopy centers should be concerned in view of indoor air quality and human health. The corona devices in photocopiers and photocopier-emitted VOCs have the potential to initiate indoor air chemistry during photocopying and result in the formation of UFP.

[1]  C. Weschler,et al.  Co-formation of hydroperoxides and ultra-fine particles during the reactions of ozone with a complex VOC mixture under simulated indoor conditions , 2005 .

[2]  S. K. Brown,et al.  Assessment of pollutant emissions from dry-process photocopiers. , 1999, Indoor air.

[3]  V. Cooray,et al.  NOx production in spark and corona discharges , 2001 .

[4]  Charles J. Weschler,et al.  Measurements of the Hydroxyl Radical in a Manipulated but Realistic Indoor Environment , 1997 .

[5]  Chia-wei Lee,et al.  Characteristics and health impacts of volatile organic compounds in photocopy centers. , 2006, Environmental research.

[6]  Peder Wolkoff,et al.  Organic compounds in indoor air—their relevance for perceived indoor air quality? , 2001 .

[7]  M. Sánchez-Quevedo,et al.  Siderosilicosis due to photocopier toner dust , 1994, The Lancet.

[8]  P Wolkoff,et al.  Formation of strong airway irritants in terpene/ozone mixtures. , 2000, Indoor air.

[9]  J. Loiseau,et al.  Numerical simulation of ozone axial and radial distribution in a cylindrical oxygen-fed ozonizer , 1994 .

[10]  Shuji Fujii,et al.  Indoor air quality for chemical and ultrafine particle contaminants from printers , 2007 .

[11]  F. Dobbs,et al.  Negative air ionisation and the production of hydrogen peroxide , 2003 .

[12]  Linda Sheldon,et al.  Evaluation of a Test Method for Measuring Indoor Air Emissions from Dry-Process Photocopiers. , 1998, Journal of the Air & Waste Management Association.

[13]  P. Wolkoff,et al.  Photocopiers and indoor air pollution , 1999 .

[14]  G Ramachandran,et al.  Comparison of Short-Term Variations (15-Minute Averages) in Outdoor and Indoor PM2.5 Concentrations , 2000, Journal of the Air & Waste Management Association.

[15]  P Wolkoff,et al.  Organic compounds in office environments - sensory irritation, odor, measurements and the role of reactive chemistry. , 2006, Indoor air.

[16]  H. K. Fai,et al.  Characterization of VOCs, ozone, and PM10 emissions from office equipment in an environmental chamber , 2001 .

[17]  P. Hopke,et al.  Experimental study of ion-induced nucleation by radon decay , 1993 .

[18]  Z. Grabarczyk.  Effectiveness of indoor air cleaning with corona ionizers , 2001 .

[19]  W. Weathers,et al.  Formation of Polyketones in Irradiated Toluene/Propylene/NO x /Air Mixtures , 2001 .

[20]  J. Yu,et al.  Atmospheric photooxidation of alkylbenzenes-I. Carbonyl product analyses , 1997 .

[21]  M. Tanaka,et al.  Mechanism of ozone generation in air-fed ozonisers , 1979 .

[22]  W. Weathers,et al.  Impact of aerosol liquid water on secondary organic aerosol yields of irradiated toluene/propylene/NOx/(NH4)2SO4/air mixtures , 2000 .

[23]  P N Breysse,et al.  An evaluation of employee exposure to volatile organic compounds in three photocopy centers. , 2000, Environmental research.

[24]  E J Reed,et al.  Biological impact of small air ions. , 1976, Science.

[25]  Richard P. Turco,et al.  From molecular clusters to nanoparticles: Role of ambient ionization in tropospheric aerosol formation , 2001 .

[26]  J. Seinfeld,et al.  Enhancement of brownian and turbulent diffusive deposition of charged aerosol particles in the presence of an electric field , 1989 .

[27]  R. Mermelstein,et al.  Acute Toxicity Studies of Xerox Reprographic Toners , 1994 .

[28]  Jun-fu Zhou,et al.  Ozone emitted during copying process--a potential cause of pathological oxidative stress and potential oxidative damage in the bodies of operators. , 2003, Biomedical and environmental sciences : BES.

[29]  P J Lioy,et al.  Ozone and limonene in indoor air: a source of submicron particle exposure. , 2000, Environmental health perspectives.

[30]  Daniel J. Rader,et al.  Aerosol Wall Losses in Electrically Charged Chambers , 1985 .

[31]  Charles J. Weschler,et al.  Indoor ozone/terpene reactions as a source of indoor particles , 1999 .

[32]  P Wolkoff,et al.  The modern office environment desiccates the eyes? , 2006, Indoor air.

[33]  Paul Lioy,et al.  Ozone-initiated reactions with mixtures of volatile organic compounds under simulated indoor conditions. , 2003, Environmental science & technology.

[34]  B. V. Pedersen,et al.  Influence of personal characteristics, job-related factors and psychosocial factors on the sick building syndrome. Danish Indoor Climate Study Group. , 1989, Scandinavian journal of work, environment & health.

[35]  G. Dekan,et al.  Granulomatous pneumonitis and mediastinal lymphadenopathy due to photocopier toner dust , 1996, The Lancet.

[36]  Kerrie Mengersen,et al.  Characteristics of particle number and mass concentrations in residential houses in Brisbane, Australia , 2003 .

[37]  R. Kamens,et al.  Characterization of secondary aerosol from the photooxidation of toluene in the presence of NOx and 1-propene. , 2001, Environmental science & technology.

[38]  John H. Seinfeld,et al.  Secondary Organic Aerosol from the Photooxidation of Aromatic Hydrocarbons: Molecular Composition , 1997 .

[39]  Per Axel Clausen,et al.  Comparison Of Volatile Organic Compounds From Processed Paper And Toners From Office Copiers And Printers: Methods, Emission Rates, And Modeled Concentrations , 1993, Indoor Air.

[40]  P. Hopke,et al.  Nanometer and ultrafine aerosols from radon radiolysis , 1993 .

[41]  Sergey A. Grinshpun,et al.  Removal of fine and ultrafine particles from indoor air environments by the unipolar ion emission , 2004, Atmospheric Environment.

[42]  Kelly W Leovic,et al.  Measurement of Indoor Air Emissions from Dry-Process Photocopy Machines. , 1996, Journal of the Air & Waste Management Association.

[43]  Y. Aizawa,et al.  Negative effect of photocopier toner on alveolar macrophages determined by in vitro magnetometric evaluation. , 2002, Industrial health.

[44]  Jen-Shih Chang,et al.  Mechanism of the ozone formations in a near liquid nitrogen temperature medium pressure glow discharge positive column , 1988 .

[45]  H. Blome,et al.  Untersuchung von Emissionen aus Bürogeräten , 2003 .