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General Description

  • Synonyms: tert-Butyl Mercaptan; 2-Methyl-2-propanethiol
  • OSHA IMIS Code Number: R217
  • Chemical Abstracts Service (CAS) Registry Number: 75-66-1
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: TZ7660000; 66128
  • Chemical Description and Physical Properties:
    • molecular weight: 90.19
    • molecular formula: C4H10S
    • boiling point: 63.7-64.2°C

Health Factors

  • Health Effects: Rubber accelerator; may release mercaptobenzothiazole, a sensitizer.

Monitoring Methods used by OSHA


Reference: Nishikawa,Yoshinori; Kuwata, Kazuhira. "Analytical Chemistry" 57, 1985, pp1864-8. Title: Liquid Chromatographic Determination of Low Molecular Weight Alkylthiols in Air via Derivatization with NBD-Chloride (7-Chloro-4-Nitro-2,1,3-Benzoxadiazole) Collection: Sep-PAK Florisil coated with NBD-Cl (Tubes used in OME 40 NBD-CL on XAD-7 may work) Air Vol and FLowrate: 100L at 0.8-1.2L/min Analysis: 2 mL of MeOH were used to dynamically desorb the derivative. The samples stood at room temp for 15 minutes before analysis by HPLC. Column: Develosil ODS-3 10cmx4mm at 30 ° C Eluent: 45/55 acetonitrile/water at 1 mL/min. Detector: UV at 425nm or fluorescent at 425 nm excitation and 510 nm emission. Mercaptans studied: Methyl, ethyl, isopropyl, propyl, 2-methyl-2-propyl, 2-butyl, 2-methyl-1-propyl, and 1-butyl

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