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Chemical Sampling Information (CSI)
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General Description

Synonyms: o-Ethyl-o-p-nitrophenyl phenylphosphonothioate; Ethyl p-nitrophenyl benzenethiophosphonate

OSHA IMIS Code Number: 1019

Chemical Abstracts Service (CAS) Registry Number: 2104-64-5

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: TB1925000; 58524

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

Chemical Description and Physical Properties:

yellow solid or brown liquid
molecular weight: 323
vapor pressure: 0.0003 mm at 212°F
melting point: 36°C

Incompatibilities: Strong oxidizers

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 0.5 mg/m3 (Skin)

Construction Industry: 0.5 mg/m3 TWA (Skin)

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): 0.5 mg/m3 TWA (Skin)

Health Factors

Potential Symptoms: Miosis, lacrimation; rhinorrhea; headaches; tight chest, wheezing, laryngeal spasms; salivation; cyanosis; anorexia; nausea, abdominal cramps, diarrhea; paralysis, convulsions; low blood pressure; cardiac irregularities; eye, skin irritation

Health Effects: Cholinesterase inhibition (HE6); LD50 (oral, rat) 26 mg/kg

Affected Organs: Respiratory system, CVS, CNS, eyes, skin, blood cholinestera

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
    analytical solvent: Toluene
    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: Partially Validated
    note: OSHA personnel may obtain sampling tubes from the Salt Lake Technical Center.

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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