<< Back to Chemical Sampling Information

Chemical Sampling Information (CSI)
Search (use word(s)/phrase)
Table of Contents
By Name
A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

By CAS Number
Quick Links
General Description

Synonyms: alpha-Naphthyl thiourea; alpha-Naphthyl thiocarbamide; 1-Naphthyl-thiourea; N(1-Naphthyl)-2-thiourea; Alphanaphthyl Thiourea

OSHA IMIS Code Number: 0235

Chemical Abstracts Service (CAS) Registry Number: 86-88-4

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: YT9275000; 86993

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN1651 153 Poison

Chemical Description and Physical Properties:

colorless, odorless solid
molecular weight: 202
vapor pressure: approx. 0 mm
boiling point: Decomposes
melting point: 388°F

Incompatibilities: Strong oxidizers

Exposure Limits

OSHA Permissable Exposure Limit (PEL):

    General Industry: 0.3 mg/m3

    Construction Industry: 0.3 mg/m3 TWA

American Conference of Governmental Industrial Hygenists (ACGIH) Threshold Limit Value (TLV): 0.3 mg/m3 TWA; Appendix A4 (Not Classifiable as a Human Carcinogen)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.3 mg/m3 TWA

Health Factors

Carcinogenic Classification:

International Agency for Research on Cancer (IARC): Group 3, not classifiable as to its carcinogenicity to humans (alpha-Naphthylthiourea)

Potential Symptoms: Vomiting; dyspnea; cyanosis; coarse pulmonary rales; mild liver damage

Health Effects: Cumulative Endocrine (thyroid and adrenal) damage (HE3) LD50 (oral, rat) 6 mg/kg

Skin Irritation: Eczema

Affected Organs: Respiratory system

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Polytetrafluoroethylene (FA) Filter, 1.0 micron
    analytical solvent: Methanol
    maximum volume: 480 Liters
    maximum flow rate: 2.0 L/min
    current analytical method: High Performance Liquid Chromatography; HPLC/UL58.
    method reference: 1 (NIOSH S-276)
    sampling and analytical error: 0.09
    method classification: Fully Validated

Conditions: column: C18 mobile phase: 50:50 Methanol: Water detector wavelength: 254nm detection limit: 0.13 mg/m3

Wipe Sampling Method:

  • sampling media: Glass Fiber Filter
    analytical solvent: Dry

Bulk Method:

  • Limit the amount of bulk submitted to one gram or one mL.
** All Trademarks are the property of their respective owners.