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Chemical Sampling Information (CSI)
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General Description

Synonyms: Calcium Carbonate; Natural calcium carbonate; Calate

OSHA IMIS Code Number: 1593

IMIS Name History: Limestone prior to 9/1/89

Chemical Abstracts Service (CAS) Registry Number: 1317-65-3

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: EV9580000

NIOSH Pocket Guide to Chemical Hazards, Limestone: chemical description, physical properties, potentially hazardous incompatibilities, and more

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 29 CFR 1910.1000 Table Z-1 - 15 mg/m3 TWA

Maritime: 29 CFR 1915.1000 Table Z-Shipyards - 15 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 10 mg/m3 TWA; The value is for particulate matter containing no asbestos and <1% crystalline silica. (TLV listed under Calcium Carbonate)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 mg/m3 TWA

Health Factors

Potential Symptoms: Irritation of eyes, skin, mucous membranes; cough, sneezing, rhinorrhea (discharge of thin mucous); lacrimation (discharge of tears)

Health Effects: Nuisance Particulates (HE19)

Affected Organs: Eyes, skin, respiratory system

Notes:

  1. A case of pneumoconiosis without pulmonary fibrosis attributed to limestone dust was reported in an office worker, whose unventilated office where he had worked for 24 years was situated within a limestone quarry. The authors cited a 1955 report of pneumoconiosis in limestone miners that was attributed to the presence of silicates (up to 10%).

Literature Basis:

  • NIOSH Pocket Guide to Chemical Hazards: Limestone.
  • International Chemical Safety Cards (WHO/IPCS/ILO): Calcium carbonate.
  • Crummy, F., Carl, I., Cameron, C.H.S. and Heaney, L.G.: A possible case of pneumoconiosis in a limestone quarry worker. Occup. Med. (Lond.) 54(7): 497-499, 2004.
  • Pohanish, R.P. (editor): Calcium Carbonate. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 453-454.

Date Last Revised: 09/28/2005

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Tared 37-mm diameter low-ash polyvinyl chloride filter
    maximum volume: 480 Liters
    maximum flow rate: 2.0 L/min
    current analytical method: Gravimetric
    method reference: OSHA Analytical Method (OSHA PV2121)
    method classification: Partially Validated
    note: OSHA personnel can obtain tared sampling media from the Salt Lake Technical Center.
    note: If the net weight of the sample yields a concentration below the standard for the substance, the Salt Lake Technical Center will perform no further work on that sample. If the net weight corresponds to an amount greater than the standard, the sample may be analyzed for the appropriate element and the result reported as the substance.
    current elemental analysis method: Atomic Absorption Spectroscopy; AAS
    method reference: OSHA Analytical Method (OSHA ID-121)
    method classification: Validated
    note: An elemental analysis is performed for total Calcium and reported as the compound.

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