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Barium Sulfate (Respirable Fraction)

General Description

  • Synonyms: Actybaryte; Artificial Barite; Barium Sulphate; Sulfuric Acid, Barium Salt (1:1)
  • OSHA IMIS Code Number: B104
  • Chemical Abstracts Service (CAS) Registry Number: 7727-43-7
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: CR0600000; 11862
  • Chemical Description and Physical Properties:
    • molecular weight: 233.40
    • molecular formula: O4S.Ba

Exposure Limits

  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • Tared Low Ash Polyvinyl Chloride (LAPVC) filter 5 microns preceded by 10 mm Nylon Cyclone
  • maximum volume: 816 Liters
  • minimum volume: 408 Liters
  • maximum flow rate: 1.7 L/min
  • current analytical method: Gravimetric
  • method reference: 11, 12
  • sampling and analytical error: 0.10
  • method classification: Fully Validated
  • note: Field method. If the gross weight of the sample yields a concentration below the standard for the air contaminate, do not submit sample to SLTC for analysis.
  • alternate analytical method: Atomic Absorption Spectroscopy; AAS
  • method reference: (OSHA ID-121)
  • method classification: Not Validated
  • note: Submit as a separate sample. An elemental analysis is + performed for Barium and reported as the compound.
Conditions:

Barium Sulfate is soluble in concentrated sulfuric acid. The ICP digestion (Sulfuric, Hydrochloric acids) is performed on samples with analysis by AAS.

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