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Shenzhen, China

Watson J.G.,Desert Research Institute | Watson J.G.,CAS Institute of Earth Environment | Chow J.C.,Desert Research Institute | Chow J.C.,CAS Institute of Earth Environment | And 5 more authors.
Aerosol and Air Quality Research | Year: 2011

Eight different PM 10 samplers with various size-selective inlets and sample flow rates were evaluated for upwind/ downwind assessment of fugitive dust emissions from two sand and gravel operations in southern California during September through October 2008. Continuous data were acquired at one-minute intervals for 24 hours each day. Integrated filters were acquired at five-hour intervals between 1100 and 1600 PDT on each day because winds were most consistent during this period. High-volume (hivol) size-selective inlet (SSI) PM 10Federal Reference Method (FRM) filter samplers were comparable to each other during side-by-side sampling, even under high dust loading conditions. Based on linearregression slope, the BGI low-volume (lovol) PQ200 FRM measured ~18% lower PM 10levels than a nearby hivol SSI in the source-dominated environment, even though tests in ambient environments show they are equivalent. Although the TSI Dust Trak DRX PM 10 concentrations did not equal those from the hivol SSI, both instruments were highly correlated (R = 0.9) at the two downwind sites. Multiple size ranges from the TSI DustTrak DRX and Grimm optical particle counters (OPC) allowed the identification of spatial non-uniformity for sources within and outside the facilities. Narrow dust plumes were only detected by some of the continuous instruments across the sampler array. Upwind PM 10 concentrations at one of the locations were higher than the downwind concentrations owing to a high concentration of industrial and vehicular activities. The shorter-duration measurements and quantification of super-coarse (> 10 μm) particles with high deposition velocities available from optical particle counters is needed to evaluate the effects of local emissions on both upwind and downwind samples. © Taiwan Association for Aerosol Research.


Cauda E.,Centers for Disease Control and Prevention | Sheehan M.,West Chester University | Gussman R.,BGI Co. | Kenny L.,UK Health and Safety Executive | Volkwein J.,Centers for Disease Control and Prevention
Annals of Occupational Hygiene | Year: 2014

Two prototype cyclones were the subjects of a comparative research campaign with a diesel particulate matter sampler (DPMS) that consists of a respirable cyclone combined with a downstream impactor. The DPMS is currently used in mining environments to separate dust from the diesel particulate matter and to avoid interferences in the analysis of integrated samples and direct-reading monitoring in occupational environments. The sampling characteristics of all three devices were compared using ammonium fluorescein, diesel, and coal dust aerosols. With solid spherical test aerosols at low particle loadings, the aerodynamic size-selection characteristics of all three devices were found to be similar, with 50% penetration efficiencies (d 50) close to the design value of 0.8 μm, as required by the US Mine Safety and Health Administration for monitoring occupational exposure to diesel particulate matter in US mining operations. The prototype cyclones were shown to have 'sharp cut' size-selection characteristics that equaled or exceeded the sharpness of the DPMS. The penetration of diesel aerosols was optimal for all three samplers, while the results of the tests with coal dust induced the exclusion of one of the prototypes from subsequent testing. The sampling characteristics of the remaining prototype sharp cut cyclone (SCC) and the DPMS were tested with different loading of coal dust. While the characteristics of the SCC remained constant, the deposited respirable coal dust particles altered the size-selection performance of the currently used sampler. This study demonstrates that the SCC performed better overall than the DPMS. © 2014 Published by Oxford University Press on behalf of the British Occupational Hygiene Society 2014.


Trademark
BGI Inc. | Date: 2013-08-14

air sampling and monitoring equipment for sampling and monitoring particulate matter.


Trademark
BGI Inc. | Date: 2013-08-14

electronic instrument for determining the accuracy of air sampling and monitoring equipment.


Trademark
BGI Inc. | Date: 2013-08-14

electronic instrument for determining the accuracy of air sampling and monitoring equipment.

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