Document Detail

Analysis of airborne and waterborne particles around a taconite ore processing facility.
MedLine Citation:
PMID:  18221826     Owner:  NLM     Status:  MEDLINE    
Since the mid-1970s, samples of airborne and waterborne fibrous particulates have been collected in the area of the Northshore Taconite Ore Processing Facility by the Minnesota Department of Health (MDH), the Minnesota Pollution Control Agency (PCA), and the University of Minnesota. Indirect sample preparation has consistently been used although other aspects of the sampling methods and sites have varied and analytical procedures were altered over time as more accurate and precise microscopy methods were developed (i.e., phase contrast optical microscopy, transmission electron microscopy, transmission electron microscopy with energy dispersive spectroscopy). In the mid-1970s, levels of airborne fibrous particulate in the Silver Bay area averaged from 0.00030 to 0.03 f/ml. This level was significantly greater than levels of similar particulates in the St. Paul, MN area, although two of the Silver Bay sampling sites, considered individually, did not indicate levels of fibrous particulate markedly different than that seen in St. Paul. More recent sampling data (i.e., 1990-2001) indicate mean concentration of airborne fibrous particulates (amphibole-like fibrous particulates) of 0.0020 f/ml with a range of values from 0.0001 to 0.0140 f/ml. Such levels are not significantly different from those seen in other non-urban environments in the US and Europe. Concentrations of fibrous particulates in water samples were higher in the mid-1970 when iron ore tailings were being deposited in Lake Superior, but since the tailings have been deposited on land waterborne levels of fibrous particulate in the Beaver River have remained relatively constant averaging in the range of 7.5 MFL. This level is only slightly in excess of the current EPA drinking water standard for fibrous particulates. Review and consideration of this data is important in determining the potential health risks associated with airborne and waterborne fibrous particulates in the areas of the Northshore Taconite Ore Processing Facility.
Charles W Axten; David Foster
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Publication Detail:
Type:  Journal Article     Date:  2007-12-07
Journal Detail:
Title:  Regulatory toxicology and pharmacology : RTP     Volume:  52     ISSN:  1096-0295     ISO Abbreviation:  Regul. Toxicol. Pharmacol.     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-11-05     Completed Date:  2009-01-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8214983     Medline TA:  Regul Toxicol Pharmacol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  S66-72     Citation Subset:  IM    
Health Risk Solutions, LLC, 1606 Maddux Lane, McLean, VA 22101, USA.
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MeSH Terms
Environmental Exposure / analysis*
Environmental Monitoring / methods*
Iron / analysis*
Microscopy, Electron, Transmission
Microscopy, Phase-Contrast
Mineral Fibers / analysis
Particulate Matter / analysis*
Risk Assessment
Silicates / analysis*
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Mineral Fibers; 0/Particulate Matter; 0/Silicates; 0/Water Pollutants, Chemical; 12249-26-2/taconite; 7439-89-6/Iron

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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