Reconstructing historical exposures to elongate mineral particles (EMPs) in the taconite mining industry for 1955-2010.

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  • Additional Information
    • Source:
      Publisher: Informa Healthcare Country of Publication: England NLM ID: 101189458 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1545-9632 (Electronic) Linking ISSN: 15459624 NLM ISO Abbreviation: J Occup Environ Hyg Subsets: MEDLINE
    • Publication Information:
      Publication: London : Informa Healthcare
      Original Publication: Philadelphia, PA : Taylor and Francis, c2004-
    • Subject Terms:
      Iron* ; Silicates*; Air Pollutants, Occupational/*analysis ; Dust/*analysis ; Minerals/*analysis ; Mining/*history ; Occupational Exposure/*analysis; History, 20th Century ; History, 21st Century ; Humans ; Minnesota ; National Institute for Occupational Safety and Health, U.S. ; Occupational Exposure/history ; United States
    • Abstract:
      As part of ongoing epidemiological studies for assessing the association between exposure to dust from taconite operations and the development of respiratory diseases, the goal of this study was to reconstruct the exposures of workers to elongate mineral particle (EMP) in the Minnesota taconite mining industry from 1955-2010. Historical NIOSH-7400 and equivalent EMP personal exposure data were extracted from two sources: (1) the Mine Safety and Health Administration (MSHA) online database recorded for all inspection results since 1978 with 655 EMP monitoring records from 1978-2010 for 13 MSHA Mine IDs associated with this study; and (2) the mining companies' internal monitoring reports contained 96 personal EMP exposure records. NIOSH-7400 EMP personal exposures were measured for workers in different jobs in all active mines in 2010 by obtaining 1,285 personal samples. After data treatment, all data were grouped into seven mines and eight departments. Within each mine-department, the yearly EMP mean concentration in f/cc for each year of operation was predicted using two approaches. The performance of two approaches varied by situation. The assumptions underlying each approach described in this article have limitations. A linear regression based on limited historical measurements and those made in 2010-2011 (Approach 1) does not yield reasonable and plausible values of the slope. Approach 2 assumes that the EMP and the respirable dust in the same department share the same historical time trend. This approach allowed us to avail of the more reasonable slope estimates from the historical respirable dust data set and yielded more plausible historical exposure estimates for most locations. This work with two different job exposure matrix (JEMs) provides a unique research opportunity to study the potential impact of exposure assessment to epidemiological results. Both JEMs are being used to assess associations between EMP and respiratory disease in epidemiological studies.
    • Grant Information:
      R01 OH010418 United States OH NIOSH CDC HHS
    • Contributed Indexing:
      Keywords: Elongate Mineral Particles (EMP); [Formula: see text]This peer-reviewed paper was presented at the 2018 International Occupational Hygiene Association meeting.; job-exposure matrix (JEM); respirable dust; respirable silica; retrospective exposure reconstruction; taconite mining
    • Accession Number:
      0 (Air Pollutants, Occupational)
      0 (Dust)
      0 (Minerals)
      0 (Silicates)
      12249-26-2 (taconite)
      E1UOL152H7 (Iron)
    • Publication Date:
      Date Created: 20191025 Date Completed: 20200722 Latest Revision: 20200722
    • Publication Date:
      20240829
    • Accession Number:
      10.1080/15459624.2019.1676431
    • Accession Number:
      31647751