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Chemical Sampling Information (CSI)
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General Description

Synonyms: N-Methyl Aniline; MA; Methyl Aniline; N-Methylaniline

OSHA IMIS Code Number: 1972

Chemical Abstracts Service (CAS) Registry Number: 100-61-8

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: BY4550000; 8347

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 2294 153; UN2294 Keep Away From Food

NIOSH Pocket Guide to Chemical Hazards, Monomethyl Aniline: chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:

yellow to light-brown liquid with a weak, ammonia-like odor
molecular weight: 107
boiling point: 384°F
vapor pressure: <1 mm
melting point: -112°F

Incompatibilities: Strong acids, strong oxidizers

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 2 ppm, 9 mg/m3

Construction Industry: 2 ppm, 9 mg/m3 TWA (Skin)

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.5 ppm, 2.2 mg/m3 TWA (Skin)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.5 ppm TWA (Skin)

Health Factors

Potential Symptoms: Weakness, dizziness; headaches; dypsnea; cyanosis, methemoglobinemia; pulmonary edema; liver, kidney damage

Health Effects: Methemoglobinemia (HE13); Anemias (HE12)

Affected Organs: Respiratory system, liver, kidney, blood

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Midget Fritted Glass Bubbler (MFGB) containing 10 mL 0.05M H2SO4
    maximum volume: 100 Liters
    maximum flow rate: 1.0 L/min
    current analytical method: Gas Chromatography; GC/FID
    method reference: 1 (NIOSH 3511) [16 KB PDF, 3 pages]
    sampling and analytical error: 0.15
    method classification: Fully Validated

On-Site Sampling Techniques/Methods:

  • device: Detector Tube
    company: Gastec
    part #: 181
    range: 2.5-45 ppm
    class: Mfg
  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 1.9 ppm @ 9.4 um
    class: Mfg
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