Synonyms: Actybaryte; Artificial Barite; Barium Sulphate; Sulfuric Acid, Barium Salt (1:1)
OSHA IMIS Code Number: B101
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
American Conference of Governmental Industrial Hygenists (ACGIH) Threshold Limit Value (TLV): 10 mg/m3 TWA; The value is for particulate matter containing no Asbestos and <1% crystalline Silica.
National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m3 TWA
Primary Laboratory Sampling/Analytical Method (SLC1):
sampling media: Tared Low Ash Polyvinyl Chloride (LAPVC) filter 5 microns
maximum volume: 960 Liters
minimum volume: 480 Liters
maximum flow rate: 2.0 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.
current 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.
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Barium Sulfate is soluble in concentrated sulfuric acid. The ICP digestion (Sulfuric, Hydrochloric acids) is performed on samples with analysis by AAS.