US Dept of Labor

Occupational Safety & Health AdministrationWe Can Help

Boron

General Description

  • Synonyms: amorphous boron
  • OSHA IMIS Code Number: B142
  • Chemical Abstracts Service (CAS) Registry Number: 7440-42-8
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: ED4550000
  • Chemical Description and Physical Properties:
    • odorless, black, hard, solid; brown amorphous powder; crystals
    • element: B
    • molecular weight: 10.81
  • Incompatibilities: Avoid storing with fluorine, chlorine, bromine, iodine, ammonia, nitric acid, sulfur, hydrogen iodide and oxidizing agents.

Health Factors

  • Notes:
    1. Elemental boron does not exist naturally. Occupational exposure to boron is mostly through inhalation of dust during the mining and subsequent processing of borate-containing minerals (e.g., borax, colemanite, boracite, kernite, and ulexite).
    2. EPA's oral reference dose (daily oral exposure likely to be without an appreciable risk of deleterious effects during a lifetime) of boron is 0.2 mg/kg/day (based mainly on animal studies with boric acid).
    3. Although some animal data indicate boron to be an essential element with unknown biochemical mechanism, human requirement of boron as a micronutrient has not been conclusively established.
    4. The California Department of Health Services established a notification level for boron of 1 milligram per liter of drinking water.
  • Date Last Revised: 12/02/2005
  • Literature Basis:
    • California Department of Health Services-Drinking Water Program: Drinking Water Notification Levels, 2005.
    • U.S. EPA Integrated Risk Information System: Toxicological Review of Boron and Compounds (CAS 7440-42-8), 2004 (EPA 635/04/052).
    • Panel on Micronutrients, et al.: Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, D.C.: The National Academies Press, 2000, 800 pp.
    • Pohanish, R.P. (editor): Boron, Boric Acid and Borax. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 355-357.

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
Wipe Sampling Method:
  • Whatman smear tab
  • analytical solvent: Deionized water

** All Trademarks are the property of their respective owners.

Search Chemical Sampling Information

Index

By Name

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

By CAS Number
collage image - OSHA Salt Lake Technical Center
Back to Top

Thank You for Visiting Our Website

You are exiting the Department of Labor's Web server.

The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. The Department of Labor also cannot authorize the use of copyrighted materials contained in linked Web sites. Users must request such authorization from the sponsor of the linked Web site. Thank you for visiting our site. Please click the button below to continue.

Close