NAME: Nitric Acid

SYNONYM(s): Aqua fortis; White fuming nitric acid (WFNA); Red fuming nitric acid (RFNA); Hydrogen nitrate

IMIS: 1860

CAS: 7697-37-2

NIOSH: RTECS QU5775000

DOT: 2032 44

DESCRIPTION:

Colorless, yellow, or red fuming liquid with an acrid, suffocating odor.
MW: 63
BP: 183 to 251 F
MP: -42 to -61 F

Exposure Limits

OSHA GENERAL INDUSTRY STANDARDS: 2 ppm, 5 mg/m3

OSHA CONSTRUCTION INDUSTRY STANDARDS: 2 ppm, 5 mg/m3 TWA

THRESHOLD LIMIT VALUE: 2 ppm, 5.2 mg/m3 TWA; 4 ppm, 10 mg/m3 STEL

RECOMMENDED EXPOSURE LIMIT: 2 ppm TWA; 4 ppm STEL

Health Factors

SYMPTOM(s): Eye, mucous membrane, skin irritation; delayed pulmonary edema, pneumonitis, bronchitis; dental erosion

HEALTH EFFECTS: Acute lung damage (HE4) Irritation-Eye, Nose, Throat, Skin---Marked (HE14)

ORGAN: Eyes, respiratory system, skin, teeth

Monitoring

SLC1:

MEDIA: Treated Silica Gel Tube (Supelco, ORBO-53; SKC, 226-10-03 or equivalent)
MAX V: 96 Liters   MAX F: 0.2 L/min (TWA)
MAX V: 7.5 Liters   MAX F: 0.5 L/min (STEL)
ANL 1: Ion Chromatography; IC
REF: 2 (OSHA ID-165SG)
SAE: 0.32
CLASS: Partially Validated
NOTE: Phosphoric, Nitric, and Sulfuric Acids may be submitted on the same sample (TWA only). For STEL samples, submit as a separate sample. Make sure that glass fiber filter plug is firmly in contact with silica gel before sampling and before sealing tube for shipment.

SECONDARY SAMPLING/ANALYTICAL METHOD (SAM2):

DEVICE: Detector Tube COMPANY: Sensidyne
PART #: 15L RANGE: 0.2-40 ppm
CLASS: Mfg DEVICE: Detector Tube COMPANY: Draeger
PART #: 67 28311 RANGE: 1-50 ppm
CLASS: Mfg

WIPE:

MEDIA FOR LIQUID SOLUTIONS: Whatman smear tab; Solvent: Deionized . Water