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Comparison of Three Real-Time Measurement Methods for Airborne Ultrafine Particles in the Silicon Alloy Industry

View Article: PubMed Central - PubMed

ABSTRACT

The aim of this study was to compare the applicability and the correlation between three commercially available instruments capable of detection, quantification, and characterization of ultrafine airborne particulate matter in the industrial setting of a tapping area in a silicon alloy production plant. The number concentration of ultrafine particles was evaluated using an Electric Low Pressure Impactor (ELPITM), a Fast Mobility Particle Sizer (FMPSTM), and a Condensation Particle Counter (CPC). The results are discussed in terms of particle size distribution and temporal variations linked to process operations. The instruments show excellent temporal covariation and the correlation between the FMPS and ELPI is good. The advantage of the FMPS is the excellent time- and size resolution of the results. The main advantage of the ELPI is the possibility to collect size-fractionated samples of the dust for subsequent analysis by, for example, electron microscopy. The CPC does not provide information about the particle size distribution and its correlation to the other two instruments is somewhat poor. Nonetheless, the CPC gives basic, real-time information about the ultrafine particle concentration and can therefore be used for source identification.

No MeSH data available.


Ultrafine PM concentration as a function of collection time, as recorded by the ELPI and the FMPS during two different days of measurement. Results from day 1 are shown on the left, day 2 on the right.
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ijerph-13-00871-f006: Ultrafine PM concentration as a function of collection time, as recorded by the ELPI and the FMPS during two different days of measurement. Results from day 1 are shown on the left, day 2 on the right.

Mentions: Figure 3 shows scatterplots together with regression analyses between the instrument results. The correlation between ELPI and FMPS is very good on day 1, and on day 2 the FMPS seems to measure high concentrations (by a factor of two) as discussed before. Between the ELPI and CPC the best correlation was found on day 2. For the ultrafine fraction of the ELPI and FMPS, the correlation is insufficient, which is further discussed below. The correlations were confirmed by Spearman’s rank correlation coefficient, which showed a correlation of FMPS to ELPI of ρ = 0.959 (Figure 2, left: day 1) and 0.957 (Figure 2, right: day 2), respectively. The correlation between the CPC and the other two instruments is lower; for FMPS to CPC, ρ = 0.814 (day 1) and ρ = 0.666 (day 2). For ELPI to CPC, ρ = 0.882 (day 1) and ρ = 0.862 (day 2) and for ELPI UFP to FMPS UFP, ρ = 0.541 (day 1) and ρ = 0.715 (day 2). ELPI UFP compared to FMPS UFP concentrations are shown in Figure 6.


Comparison of Three Real-Time Measurement Methods for Airborne Ultrafine Particles in the Silicon Alloy Industry
Ultrafine PM concentration as a function of collection time, as recorded by the ELPI and the FMPS during two different days of measurement. Results from day 1 are shown on the left, day 2 on the right.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036704&req=5

ijerph-13-00871-f006: Ultrafine PM concentration as a function of collection time, as recorded by the ELPI and the FMPS during two different days of measurement. Results from day 1 are shown on the left, day 2 on the right.
Mentions: Figure 3 shows scatterplots together with regression analyses between the instrument results. The correlation between ELPI and FMPS is very good on day 1, and on day 2 the FMPS seems to measure high concentrations (by a factor of two) as discussed before. Between the ELPI and CPC the best correlation was found on day 2. For the ultrafine fraction of the ELPI and FMPS, the correlation is insufficient, which is further discussed below. The correlations were confirmed by Spearman’s rank correlation coefficient, which showed a correlation of FMPS to ELPI of ρ = 0.959 (Figure 2, left: day 1) and 0.957 (Figure 2, right: day 2), respectively. The correlation between the CPC and the other two instruments is lower; for FMPS to CPC, ρ = 0.814 (day 1) and ρ = 0.666 (day 2). For ELPI to CPC, ρ = 0.882 (day 1) and ρ = 0.862 (day 2) and for ELPI UFP to FMPS UFP, ρ = 0.541 (day 1) and ρ = 0.715 (day 2). ELPI UFP compared to FMPS UFP concentrations are shown in Figure 6.

View Article: PubMed Central - PubMed

ABSTRACT

The aim of this study was to compare the applicability and the correlation between three commercially available instruments capable of detection, quantification, and characterization of ultrafine airborne particulate matter in the industrial setting of a tapping area in a silicon alloy production plant. The number concentration of ultrafine particles was evaluated using an Electric Low Pressure Impactor (ELPITM), a Fast Mobility Particle Sizer (FMPSTM), and a Condensation Particle Counter (CPC). The results are discussed in terms of particle size distribution and temporal variations linked to process operations. The instruments show excellent temporal covariation and the correlation between the FMPS and ELPI is good. The advantage of the FMPS is the excellent time- and size resolution of the results. The main advantage of the ELPI is the possibility to collect size-fractionated samples of the dust for subsequent analysis by, for example, electron microscopy. The CPC does not provide information about the particle size distribution and its correlation to the other two instruments is somewhat poor. Nonetheless, the CPC gives basic, real-time information about the ultrafine particle concentration and can therefore be used for source identification.

No MeSH data available.