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Relationship between lead levels on painted surfaces and percent lead in the particles aerosolized during lead abatement.

Authors
Choe-KT; Trunov-M; Menrath-W; Succop-P; Grinshpun-SA
Source
Appl Occup Environ Hyg 2002 Aug; 17(8):573-579
NIOSHTIC No.
20041052
Abstract
Quantifying airborne lead on lead abatement work sites is critical in assessing worker lead exposures. Airborne lead levels depend on both the concentration of aerosolized particles and the percent lead in those particles. The lead level on the painted surface being abated may affect the percent lead in aerosolized particles. Experiments were performed in the University of Cincinnati Environmental Test Chamber (volume approximately 24.3 m3) using wood doors painted with lead-based paint. Three methods were used for paint removal: dry scraping, wet scraping, and dry machine sanding. Particles aerosolized during lead abatement activities were collected on filters using the Button Personal Inhalable Aerosol Samplers (SKC Inc., Eighty Four, PA) mounted in the workers' breathing zone. The filters were subsequently analyzed for percent lead in the particles. A portable X-ray fluorescence (XRF) instrument (NITON-700, NITON Inc., Bedford, MA) was used to measure surface lead levels of the doors. The accuracy of the XRF instrument was verified by testing standard reference materials prepared by the National Institute of Standards and Technology (NIST) and by Princeton Gamma Tech Inc. It was also verified by relating XRF results from painted door surfaces to laboratory lead analysis data obtained from paint chip samples taken from the same painted surfaces (r2 = 0.81, p < 0.001). A highly significant relationship (r2 = 0.83, p < 0.001) was found between the XRF readings and the percent lead in the particles aerosolized during dry scraping. No significant relationship was found for wet scraping (r2 = 0.09, p = 0.56) or dry machine sanding (r2 = 0.002, p = 0.92). The relationship between surface lead levels and percent lead in particles was found to be dependent on the paint removal method. This variation was attributed to the difference in water absorption property of the paint layers and the different particle aerosolization mechanisms inherent in each paint removal method.
Keywords
Lead-compounds; Lead-dust; Paints; Paint-removers; Air-contamination; Employee-exposure; Exposure-assessment; Aerosol-particles; Laboratory-testing; Exposure-chambers; Filters; Sampling-equipment; Analytical-instruments; Samplers; Breathing-zone; Aerosol-sampling; X-ray-fluorescence-analysis; Author Keywords: Lead Abatement; Lead-Based Paint; Airborne Particles; XRF; Percent Lead
CODEN
AOEHE9
CAS No.
7439-92-1
Publication Date
20020801
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2002
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-CCT-510420; Grant-Number-T42-CCT-510520
Issue of Publication
8
ISSN
1047-322X
Source Name
Applied Occupational and Environmental Hygiene
State
OH
Performing Organization
Department of Environmental Health, University of Cincinnati, Cincinnati, Ohio
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