Nitric acid
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CAS
7697-37-2
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HNO3
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RTECS
QU5775000
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Synonyms & Trade Names
Aqua fortis, Engravers acid, Hydrogen nitrate, Red fuming nitric acid (RFNA), White fuming nitric acid (WFNA)
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DOT ID & Guide
2031 / 157 (other than red fuming)
2032 / 157 (fuming)
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Exposure
Limits
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NIOSH REL: TWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3)
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OSHA PEL†: TWA 2 ppm (5 mg/m3)
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IDLH
25 ppm
See: 7697372
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Conversion
1 ppm = 2.58 mg/m3
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Physical Description
Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.]
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MW: 63.0
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BP: 181°F
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FRZ: -44°F
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Sol: Miscible
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VP: 48 mmHg
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IP: 11.95 eV
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Sp.Gr(77°F): 1.50
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Fl.P: NA
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UEL: NA
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LEL: NA
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Noncombustible Liquid, but increases the flammability of combustible materials.
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Incompatibilities & Reactivities
Combustible materials, metallic powders, hydrogen sulfide, carbides, alcohols [Note: Reacts with water to produce heat. Corrosive to metals.]
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Measurement Methods
NIOSH 7903; OSHA ID165SG
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash (pH<2.5), Quick drench (pH<2.5)
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
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Respirator Recommendations
NIOSH/OSHA
Up to 25 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
(APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern¿
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern¿
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern¿/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, mucous membrane; delayed pulmonary edema, pneumonitis, bronchitis; dental erosion
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Target Organs
Eyes, skin, respiratory system, teeth
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See also: INTRODUCTION
See ICSC CARD: 0183 See MEDICAL TESTS: 0158
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