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General Description

  • Synonyms: S-(O,O-Diisopropylphosphorodithioate) ester of N-(2-mercaptoethyl)benzenesulfonamide; Bensulide; Prefar
  • OSHA IMIS Code Number: B509
  • Chemical Abstracts Service (CAS) Registry Number: 741-58-2
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: TE0250000; 59143
  • Chemical Description and Physical Properties:
    • used to control grasses and broad-leaf weeds in lawn; viscous amber liquid above 34.4°C
    • molecular weight: 398

Health Factors

  • Health Effects: LD50 (oral, rat) 1082 mg/kg

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • XAD-7 Tube (100/50 mg sections, 15/50 mesh)
  • maximum volume: 480 Liters
  • maximum flow rate: 1.0 L/min
  • current analytical method: Gas Chromatography; GC/FPD
  • method reference: 2 (OSHA In-House File)
  • method classification: Not Validated
  • note: OSHA personnel may obtain sampling tubes from the Salt Lake Technical Center (SLTC).
Wipe Sampling Method:
  • Glass Fiber Filter
Bulk Method:
  • Limit the amount of bulk submitted to one gram or one mL.

3% OV-1 on Chrom W 80/100 inlet: 250 detector: 250 oven temperature: 230°C C/P WEB 7-83

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