PMID- 22464753
OWN - NLM
STAT- MEDLINE
DCOM- 20120803
LR  - 20120423
IS  - 1873-3336 (Electronic)
IS  - 0304-3894 (Linking)
VI  - 217-218
DP  - 2012 May 30
TI  - Impact of two particle measurement techniques on the determination of N95 class 
      respirator filtration performance against ultrafine particles.
PG  - 51-7
LID - 10.1016/j.jhazmat.2012.02.058 [doi]
AB  - The purpose of this experimental study was to compare two different particle 
      measurement devices; an Electrical Low Pressure Impactor (ELPI) and a Scanning 
      Mobility Particle Sizer (SMPS), to measure the number concentration and the size 
      distribution of NaCl salt aerosols to determine the collection efficiency of 
      filtering respirators against poly disperse aerosols. Tests were performed on 
      NIOSH approved N95 filtering face-piece respirators (FFR), sealed on a manikin 
      head. Ultrafine particles found in the aerosols were also collected and observed 
      by transmission electron microscopy (TEM). According to the results, there is a 
      systematic difference for the particle size distribution measured by the SMPS and 
      the ELPI. It is largely attributed to the difference in the measurement 
      techniques. However, in spite of these discrepancies, reasonably similar trends 
      were found for the number concentration with both measuring instruments. The 
      particle penetration, calculated based on mobility and aerodynamic diameters, 
      never exceeded 5% for any size range measured at constant flow rate of 85 L/min. 
      Also, the most penetrating particle size (MPPS), with the lowest filtration 
      efficiency, would occur at a similar ultrafine size range <100 nm. With the ELPI, 
      the MPPS was at 70 nm aerodynamic diameter, whereas it occurred at 40 nm mobility 
      diameter with the SMPS.
CI  - Copyright (c) 2012 Elsevier B.V. All rights reserved.
FAU - Mostofi, Reza
AU  - Mostofi R
AD  - Department of Building, Civil and Environmental Engineering Concordia University, 
      Montreal, Quebec, Canada.
FAU - Noel, Alexandra
AU  - Noel A
FAU - Haghighat, Fariborz
AU  - Haghighat F
FAU - Bahloul, Ali
AU  - Bahloul A
FAU - Lara, Jaime
AU  - Lara J
FAU - Cloutier, Yves
AU  - Cloutier Y
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20120302
PL  - Netherlands
TA  - J Hazard Mater
JT  - Journal of hazardous materials
JID - 9422688
SB  - IM
MH  - Filtration/*instrumentation
MH  - Particle Size
MH  - *Respiratory Protective Devices
EDAT- 2012/04/03 06:00
MHDA- 2012/08/04 06:00
CRDT- 2012/04/03 06:00
PHST- 2011/10/27 00:00 [received]
PHST- 2012/02/21 00:00 [revised]
PHST- 2012/02/22 00:00 [accepted]
PHST- 2012/04/03 06:00 [entrez]
PHST- 2012/04/03 06:00 [pubmed]
PHST- 2012/08/04 06:00 [medline]
AID - S0304-3894(12)00215-4 [pii]
AID - 10.1016/j.jhazmat.2012.02.058 [doi]
PST - ppublish
SO  - J Hazard Mater. 2012 May 30;217-218:51-7. doi: 10.1016/j.jhazmat.2012.02.058. 
      Epub 2012 Mar 2.