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Chemical Sampling Information (CSI)
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General Description

Synonyms: Mercaptoacetic Acid; Thiovanic Acid

OSHA IMIS Code Number: 2423

Chemical Abstracts Service (CAS) Registry Number: 68-11-1

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: A15950000; 2482

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 1940 153; UN1940 Corrosive

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

Chemical Description and Physical Properties:
molecular weight: 92.12
boiling point: 123°C
molecular formula: C2H4O2S
Exposure Limits

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 1 ppm, 3.8 mg/m3 TWA (Skin)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 1 ppm TWA (Skin)


Health Factors

Health Effects: LD50 (oral,rat) 0.15 mg/kg

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • sampling media: Midget Impinger containing 15 mL Deionized water
    maximum volume: 120 Liters
    maximum flow rate: 1.0 L/min
    current analytical method: High Performance Liquid Chromatography; HPLC/UV
    method reference: 2 (OSHA In-House File)
    method classification: Not Validated
Conditions: Zorbax C18; 10% methanol 90% water 0.1% H3PO4; 1 mL/min; UV Det: 240; DL 2 ug/sample; C/P DB

Bulk Method: Limit the amount of bulk submitted to one gram or one mL.

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Page last updated: 08/24/1992