DOI: 10.1016/j.atmosenv.2019.117249
论文题名: Re-evaluation of BioSampler and its improvement for on-line, time-resolved monitoring of environmental coarse aerosol
作者: Su Y. ; Wang W. ; Wang W. ; Zhai L. ; Shen X. ; Xu J. ; Li Z.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 225 语种: 英语
英文关键词: Aerosols
; Curve fitting
; Drops
; Efficiency
; Function evaluation
; Inductively coupled plasma
; Inductively coupled plasma mass spectrometry
; Mass spectrometers
; Monitoring
; Particle size analysis
; Radioactive elements
; BioSampler
; Coarse aerosols
; Continuous extraction
; Retention efficiencies
; Sampling efficiency
; Extraction
; nanoparticle
; polystyrene
; accuracy assessment
; aerosol
; environmental monitoring
; Gaussian method
; nanoparticle
; performance assessment
; pressure drop
; relative humidity
; theoretical study
; atmospheric pressure
; concentration (parameter)
; environmental monitoring
; environmental temperature
; evaluation study
; flow rate
; humidity
; inductively coupled plasma mass spectrometry
; online monitoring
; particle size
; priority journal
; secondary organic aerosol
学科: BioSampler
; Continuous-extraction BioSampler
; Environmental coarse aerosol
; Monitoring
; Retention efficiency
; Sampling efficiency
中文摘要: BioSampler is now being widely used for bioaerosol sampling. However, the sampling efficiency in wide size range especially for nanoparticles as well as the size-dependent retention efficiency have not been well evaluated until now. Through literature review, theoretic analysis and experiments, this paper reviews the sampling process, collection mechanism and sampling performance of commercial BioSampler including pressure drop as a function of sampling flow rate, the mass loss rate and temperature of the collection fluid as a function of sampling time, the variation of retention efficiency with time, and the sampling efficiency in wide size range from nanometers to microns. The effects of low pressure and high relative humidity on determination of sampling efficiency in literature were carefully analyzed. To compensate the collection fluid loss and extract the insoluble/dissolved sample for further analysis, Continuous-Extraction BioSampler (CEBS) is proposed. The retention efficiency for particles of different sizes as well as the collection efficiency were determined and found to be identical with commercial BioSampler when no steam was introduced into CEBS. Finally, the combination uses of CEBS and Inductively-Coupled-Plasma Mass Spectrometer (ICP-MS) was developed. Exponentially Modified Gaussian (EMG) Model was derived and verified to describe the temporal concentration of the dissolved component originating from individual soluble droplet. Using internal standard calibration method and EMG fitting of signal curve, the target element amount in individual droplet could be determined accurately. For continuously-collected soluble droplet with duration of minutes, the observed signal curve can be described by EMG model and the fitted value of area varies linearly with the sample amount introduced. This paper not only provides comprehensive performance evaluation of commercial BioSampler, but also demonstrates that the proposed CEBS-ICPMS is capable of monitoring environmental coarse aerosol with time resolution of ~17 min. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160886
Appears in Collections: 气候变化与战略
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作者单位: Northwest Institute of Nuclear Technology, P.O. box 69-14, Xi'an, 710024, China
Recommended Citation:
Su Y.,Wang W.,Wang W.,et al. Re-evaluation of BioSampler and its improvement for on-line, time-resolved monitoring of environmental coarse aerosol[J]. Atmospheric Environment,2020-01-01,225