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Chemical Sampling Information (CSI)
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General Description

Synonyms: Dimethylamine, anhydrous

OSHA IMIS Code Number: 0928

Chemical Abstracts Service (CAS) Registry Number: 124-40-3

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: IP8750000; 31609

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN1032 118 Flammable Gas (Anhydrous); UN1160 132 Flammable Liquid (Solution)

Chemical Description and Physical Properties:

    molecular weight: 45
    boiling point: 44°F
    vapor pressure: 1.7 atm
    melting point: -134°F

Incompatibilities: Strong oxidizers, chlorine, mercury

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 10 ppm, 18 mg/m3

Construction Industry: 10 ppm, 18 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 ppm, 9.2 mg/m3 TWA; 15 ppm, 27.6 mg/m3 STEL; Appendix A4 (Not Classifiable as a Human Carcinogen)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 ppm TWA

Health Factors

Potential Symptoms: Nose, throat irritation; sneezing, coughing, dyspnea; pulmonary edema; conjunctivitis; burns skin, mucous membranes; dermatitis

Health Effects: Irritation-Eye, Nose, Throat, Skin---Marked (HE14) Cumulative liver, testicular damage (HE3)

Affected Organs: Respiratory system, skin, eyes

Additional Information:

  • Occupational Health Guidelines for Chemical Hazards. US Department of Health and Human Services (DHHS), National Institute for Occupational Safety and Health (NIOSH) Publication No. 81-123, (1981, January). Provides a table of contents of guidelines for many hazardous chemicals. The files provide technical chemical information, including chemical and physical properties, health effects, exposure limits, and recommendations for medical monitoring, personal protective equipment (PPE), and control procedures.
Monitoring Methods used by OSHA

Primary Sampling/Analytical Method (SLC1):

  • sampling media: Coated XAD-7 Tube (80/40 mg sections, 20/50 mesh); Coating is 10% (w/w) NBD-Chloride.
    analytical solvent: Tetrahydrofuran
    maximum volume: 10 Liters
    maximum flow rate: 0.2 L/min
    current analytical method: High Performance Liquid Chromatography; HPLC/FLU/VIS
    method reference: 2 (OSHA 34)
    sampling and analytical error: 0.09
    method classification: Fully Validated
    note: OSHA personnel may obtain sampling tubes from the Salt Lake Technical Center.

Conditions:

  • column: Radial CN
    mobile phase: 80:20 Isooctane:Water
    flouresence detector wavelength:
      excitation: 465
      emissions: 525
    detection limit: 2.8 ng/inj

Secondry Sampling/Analytical Method (SAM2):

  • device: Detector Tube
    company: Gastec
    part #: 180
    range: 1-60 ppm
    class: Mfg
  • device: Detector Tube
    company: MSA
    part #: 92115
    range: 5-100 ppm
    class: Mfg
  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 1.2 ppm @ 8.8 um
    class: Mfg
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