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Determination of an Occupational Exposure Guideline for Manganese Using the Benchmark Method

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  • Harvey J. Clewell
  • Gregory A. Lawrence
  • Donald B. Calne
  • Kenny S. Crump

Abstract

An occupational risk assessment for manganese (Mn) was performed based on benchmark dose analysis of data from two epidemiological studies providing dose‐response information regarding the potential neurological effects of exposure to airborne Mn below the current Occupational Safety and Health Administration (OSHA) Permissible Exposure Level (PEL) of 5 mg Mn/m3. Based on a review of the scientific evidence regarding the toxicity of Mn, it was determined that the most appropriate measure of exposure to airborne Mn for the subclinical effects measured in these studies is recent (rather than historical or cumulative) concentration of Mn in respirable (rather than total) particulate. For each of the studies analyzed, the individual exposure and response data from the original study had been made available by the investigators. From these two studies benchmark concentrations calculated for eight endpoints ranged from 0.09 to 0.27 mg Mn/m3. From our evaluation of these results, and considering the fact that the subtle, subclinical effects represented by the neurological endpoints tested in these studies do not represent material impairment, we believe an appropriate occupational exposure guideline for manganese would be in the range of 0.1 to 0.3 mg Mn/m3, based on the respirable particulate fraction only, and expressed as an 8‐hour time‐weighted average.

Suggested Citation

  • Harvey J. Clewell & Gregory A. Lawrence & Donald B. Calne & Kenny S. Crump, 2003. "Determination of an Occupational Exposure Guideline for Manganese Using the Benchmark Method," Risk Analysis, John Wiley & Sons, vol. 23(5), pages 1031-1046, October.
    • Handle: RePEc:wly:riskan:v:23:y:2003:i:5:p:1031-1046
    DOI: 10.1111/1539-6924.00379
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    References listed on IDEAS

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    1. Kenny S. Crump, 1995. "Calculation of Benchmark Doses from Continuous Data," Risk Analysis, John Wiley & Sons, vol. 15(1), pages 79-89, February.
    2. Kenny S. Crump, 1998. "On Summarizing Group Exposures in Risk Assessment: Is an Arithmetic Mean or a Geometric Mean More Appropriate?," Risk Analysis, John Wiley & Sons, vol. 18(3), pages 293-297, June.
    3. J. Michael Davis & Annie M. Jarabek & David T. Mage & Judith A. Graham, 1998. "The EPA Health Risk Assessment of Methylcyclopentadienyl Manganese Tricarbonyl (MMT)," Risk Analysis, John Wiley & Sons, vol. 18(1), pages 57-70, February.
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