US EPA

1510030 

Technical Report 

Dissociation of Hexavalent Chromium from Primer Paint Particles into Simulated Mucus Fluid 

Moran, MP; Lapuma, PT 

2005 

Govt Reports Announcements & Index (GRA&I), Issue 23, 2005 

107 

Master's thesis. litary relies heavily on chromate primer paints to protect equipment from corrosion. Epidemiological studies link chromate exposure to cancer however limited studies suggest exposure to chromate paint particles does not increase the risk of lung cancer. The particle size and paint type may hinder chromate released into lung fluid. To simulate particle deposition in the mucosal layer of the lungs, a viable cascade impactor collected paint particles into porcine-based simulated lung fluid (SLF). Samples were tested after 24 hours for dissolved and total chromate to determine the fraction of Cr(exp +6)(exp +6) that dissociated from the particles into the Porcine-SLF. In strontium chromate paints, 0.65-2.1 microns sized particles released significantly less chromate than 2.1-7.0 micron sizes. Barium chromate paints only released 3-7% of its chromate, while strontium based paints released from 20-90%. This method demonstrates a technique to evaluate the bioavailability of contaminants from any type of aerosols. 

Fluids; Chromium; Mucous membranes; Paint primers; Lung cancer; Particle size; Aerosols; Corrosion; Chromates; Deposition; Viability; Dissociation; Samplers; Strontium; Chromate paint particles; Slf(Simulated lung fluid)