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Chemical Sampling Information (CSI)
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General Description

OSHA IMIS Code Number: 2325

Chemical Abstracts Service (CAS) Registry Number: 7440-25-7

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: WW5505000

NIOSH Pocket Guide to Chemical Hazards, Tantalum (metal, oxide dusts): chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:
solid; appearance, odor, and properties vary depending upon specific compound
Incompatibilities: Strong oxidizers

Exposure Limits

OSHA Permissible Exposure Limit (PEL):
General Industry: 5 mg/m3

Construction Industry: 5 mg/m3 TWA
American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 mg/m3 TWA

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA; 10 mg/m3 STEL


Health Factors

Potential Symptoms: In animals: pulmonary irritation

Health Effects: Apparent low toxicity (HE19)

Affected Organs: None known in humans

Monitoring Methods used by OSHA

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 analysis
    method reference: 2 (OSHA In-House File), 11, 12
    sampling and analytical error: 0.10
    method classification: Fully Validated
    note: Evaluate Gravimetrically. If gross weight is less than PEL do not send to SLTC for analysis.
Wipe Sampling Method:
  • media: Whatman smear tab; Solvent: Deionized water
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Page last updated: 12/28/1993