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Characterizing exposures to airborne metals and nanoparticle emissions in a refinery.

Authors
Miller-A; Drake-PL; Hintz-P; Habjan-M
Source
Ann Occup Hyg 2010 Jul; 54(5):504-513
NIOSHTIC No.
20036745
Abstract
An air quality survey was conducted at a precious metals refinery in order to evaluate worker exposures to airborne metals and to provide detailed characterization of the aerosols. Two areas within the refinery were characterized: a furnace room and an electro-refining area. In line with standard survey practices, both personal and area air filter samples were collected on 37-mm filters and analyzed for metals by inductively coupled plasma-atomic emission spectroscopy. In addition to the standard sampling, measurements were conducted using other tools, designed to provide enhanced characterization of the workplace aerosols. The number concentration and number-weighted particle size distribution of airborne particles were measured with a fast mobility particle sizer (FMPS). Custom-designed software was used to correlate particle concentration data with spatial location data to generate contour maps of particle number concentrations in the work areas. Short-term samples were collected in areas of localized high concentrations and analyzed using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) to determine particle morphology and elemental chemistry. Analysis of filter samples indicated that all of the workers were exposed to levels of silver above the Occupational Safety and Health Administration permissible exposure limit of 0.01 mg m-3 even though the localized ventilation was functioning. Measurements with the FMPS indicated that particle number concentrations near the furnace increased up to 1000-fold above the baseline during the pouring of molten metal. Spatial mapping revealed localized elevated particle concentrations near the furnaces and plumes of particles rising into the stairwells and traveling to the upper work areas. Results of TEM/EDS analyses confirmed the high number of nanoparticles measured by the FMPS and indicated the aerosols were rich in metals including silver, lead, antimony, selenium, and zinc. Results of the survey were used to deduce appropriate strategies for mitigation of worker exposure to airborne metals.
Keywords
Metal-compounds; Metal-fumes; Metal-industry-workers; Metal-refining; Metallic-fumes; Metals; Refineries; Air-quality; Air-quality-measurement; Air-quality-monitoring; Nanotechnology; Aerosols; Aerosol-particles; Author Keywords: aerosol; aerosol mapping; metals; particle; ultrafine
Contact
Arthur Miller, National Institute for Occupational Safety and Health, Spokane Research Laboratory, 315 E. Montgomery Ave, Spokane, WA 99207, USA
CODEN
AOHYA3
CAS No.
7440-22-4; 7439-92-1; 7440-36-0; 7782-49-2; 7440-66-6
Publication Date
20100701
Document Type
Journal Article
Email Address
ALMiller@cdc.gov
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0003-4878
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Annals of Occupational Hygiene
State
WA
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