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Chemical Sampling Information (CSI)
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General Description

Synonyms: Ethanethiol

OSHA IMIS Code Number: 1220

Chemical Abstracts Service (CAS) Registry Number: 75-08-1

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: KI9625000; 33703

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN2363 129 Flammable Liquid

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

Chemical Description and Physical Properties:

molecular weight: 62.14
molecular formula: C2H6S
ODRTHRS: 0.76 ppb
boiling point: 36°C

Incompatibilities: Strong oxidizers

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 10 ppm, 25 mg/m3 Ceiling

Construction Industry: 0.5 ppm, 1 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.5 ppm, 1.3 mg/m3 TWA

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

Health Factors

Potential Symptoms: Headaches; nausea; mucous membrane, irritation; in animals: incoordination; weakness; pulmonary irritation; liver, kidney damage; cyanosis

Health Effects: Odor (HE20); Irritation-Nose, Throat---Mild (HE16)

Affected Organs: Respiratory system; in animals: liver, kidneys

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Coated Glass Fiber Filter (37 mm Gelman Type A) Coating is 5% (w/v) Mercuric Acetate solution
    analytical solvent: 20 mL-25% HCl, 5 mL-Methylene Chloride
    maximum volume: 150 Liters
    maximum flow rate: 0.2 L/min
    current analytical method: Gas Chromatography; GC/FPD
    method reference: 1 (NIOSH 2542)
    sampling analytical error: 0.16
    method classification: Partially Validated
    note: Protect samples from light until analysis.

Articles: Reference: Knarr, Richard D.; Rappaport, Stephen M. "Am. Ind. Hyg. Assoc. J." 1981, 42.

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • device: Detector Tube
    company: Gastec
    part #: 72
    range: 1-120 ppm
    class: Mfg

  • device: Detector Tube
    company: MSA
    part #: 454206
    range: 0.5-100 ppm
    class: Mfg

  • device: Detector Tube
    company: Kitagawa
    part #: 165A
    range: 1-160 ppm
    class: Mfg

  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 0.8 ppm @ 3.3 um
    class: Mfg

  • device: Instrumentation
    company: Organic Vapor Analyzer
    part #: Organic Vapor Analyzer
    class: Mfg

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