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Chemical Sampling Information (CSI)
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General Description

Synonyms: 4-Amino-6-t-Butyl-3-(Methylthio)-as-Triazin-5(4H)-one prior to 9/1/89

OSHA IMIS Code Number: A175

Chemical Abstracts Service (CAS) Registry Number: 21087-64-9

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: XZ2990000; 84134

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

Chemical Description and Physical Properties:

colorless crystals soluble in alcohols, slightly soluble in water
molecular weight: 214.32
molecular formula: C8H14N4OS
melting point: 125°C

Exposure Limits

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

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: OSHA Versatile Sampler (OVS-2) - 13 mm XAD-2 tube (270/140 mg sections, 20/60 mesh) with Glass Fiber Filter enclosed
    maximum volume: 240 Liters
    maximum flow rate: 1.0 L/min
    current analytical method: Gas Chromatography; GC/FPD
    method reference: 2 (OSHA In-House File)
    method classification: Partially Validated

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