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Calcium carbonate (Respirable Fraction)

General Description

  • Synonyms: Aragonite; Oyster Shells; Calcite; Chalk; Limestone; Marble; Marl; Travertine
  • OSHA IMIS Code Number: C130
  • Chemical Abstracts Service (CAS) Registry Number: 1317-65-3; 471-34-1
  • Chemical Description and Physical Properties:
    • solid

Exposure Limits

  • OSHA Permissible Exposure Limit (PEL):
    • General Industry: See Dust (Respirable Nuisance) 5.0 mg/m3 (TABLE Z-3) or Dust, Total 15.0 mg/m3 (TABLE Z-3)
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA

Health Factors

  • Health Effects: Nuisance Particulates (HE19)

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: 480 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 the sample to the Salt Lake Technical Center (SLTC) for analysis.
  • alternate analytical method: Atomic Absorption Spectroscopy; AAS
  • reference: 2 (OSHA ID-121)
  • method classification: Not Validated
  • note: An elemental analysis is performed for total calcium and reported as the compound.

Calcium carbonate is soluble in concentrated mineral acids

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