Nitric acid |
Synonyms & Trade Names Aqua fortis, Engravers acid, Hydrogen nitrate, Red fuming nitric acid (RFNA), White fuming nitric acid (WFNA) |
CAS No. 7697-37-2 |
RTECS No. QU5775000 |
DOT ID & Guide 2031 157 (other than red fuming)
2032 157 (fuming) |
FormulaHNO3 |
Conversion 1 ppm = 2.58 mg/m3 |
IDLH 25 ppm
See: 7697372 |
Exposure Limits NIOSH REL: TWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3)
OSHA PEL†: TWA 2 ppm (5 mg/m3) |
Measurement Methods
NIOSH 7903;
OSHA ID165SG
See: NMAM or OSHA Methods |
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.] |
MW: 63.0 |
BP: 181°F |
FRZ: -44°F |
Sol: Miscible |
VP: 48 mmHg |
IP: 11.95 eV |
| Sp.Gr(77°F): 1.50 |
Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Liquid, but increases the flammability of combustible materials. |
Incompatibilities & Reactivities Combustible materials, metallic powders, hydrogen sulfide, carbides, alcohols [Note: Reacts with water to produce heat. Corrosive to metals.] |
Exposure Routes inhalation, ingestion, skin and/or eye contact |
Symptoms irritation eyes, skin, mucous membrane; delayed pulmonary edema, pneumonitis, bronchitis; dental erosion |
Target Organs Eyes, skin, respiratory system, teeth |
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Personal Protection/Sanitation (See protection codes)
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) |
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately |
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 |
| See also: INTRODUCTION See ICSC CARD: 0183 See MEDICAL TESTS: 0158 |
