| Agent Name |
Tantalum, metal and tantalum oxide, dust |
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| CAS Number |
7440-25-7; 1314-61-0 |
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| Formula |
Ta, O5-Ta2 |
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| Major Category |
Metals |
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| Synonyms |
Tantalum metal; Tantalum-181; Tantalum compounds; [NIOSH] Tantalic acid anhydride; Tantalum penta oxide; Tantalum pentoxide; [ChemIDplus] |
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| Category |
Metals, Inorganic Compounds |
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| Description |
Metal: Steel-blue to gray solid or black, odorless powder; [NIOSH] A rare, lustrous, transition metal; [Wikipedia] |
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| Sources/Uses |
Rare element in earth's crust, about 0.003% for tantalum and niobium together; Obtained from the minerals columbite, tantalite, and microlite; Used to make capacitors, rectifiers, chemical-resistant and heat-resistant equipment, high-speed tools, dental and surgical implants, pen points, and parts for furnaces, aircraft, and nuclear reactors; [HSDB] |
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| Comments |
"A 10 yr study of tantalum gauze use in the repair of hernias revealed no effects from the gauze itself." Chemical workers and welders exposed to tantalum and niobium dust for 3-24 years at concentrations up to 120 mg/m3 had radiological evidence of pulmonary fibrosis. [HSDB] |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| TLV (ACGIH) |
5 mg/m3, as Ta |
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| PEL (OSHA) |
5 mg/m3, as Ta |
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| MAK |
4 mg/m3, inhalable fraction(metal), 1.5 mg/m3, respirable fraction(metal) |
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| IDLH (NIOSH) |
2500 mg/m3, as Ta |
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| Excerpts from Documentation for IDLHs |
Basis for revised IDLH: No inhalation toxicity data are available on which to base an IDLH for tantalum metal and oxide dust. |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: TANTALUM COMPOUNDS TANTALUM
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