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Chemical Sampling Information (CSI)
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General Description

Synonyms: Difonate; ENT 25,796; N-2790; Stauffer N-2790; Ethyl s-phenyl ethyl phosphonothiolthionate; Diphonate; Dyfonate prior to 9/1/89

OSHA IMIS Code Number: 2685

Chemical Abstracts Service (CAS) Registry Number: 944-22-9

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: TA5950000; 58367

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN2903 131 Poison, Flammable Liquid

Chemical Description and Physical Properties:

light yellow liquid, soil insecticide
molecular weight: 246
boiling point: 0.013 kPa : 130°C

Exposure Limits

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.1 mg/m3 TWA (Skin); Appendix A4 (Not Classifiable as a Human Carcinogen)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.1 mg/m3 TWA (Skin)

Health Factors

Health Effects: Cholinesterase inhibition (HE6); LD50 (oral,rat) 3 mg/kg

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: 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.

Conditions: HPLC/UV; ACN extraction; u Bondapak C18; 80% methanol 20% water; 0.9 mL/min; UV det: 254; Retention time, 8.25 min; 1.2 ng/inj; C/P GFL 2/83

Wipe Sampling Method:

  • sampling media: Glass fiber filter

Bulk Method:

  • Limit the amount of bulk submitted to one gram or one mL.

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