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Chemical Sampling Information (CSI)
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General Description

Synonyms: 2,4-DCP; DCP

OSHA IMIS Code Number: 0895

Chemical Abstracts Service (CAS) Registry Number: 120-83-2

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: SK8575000

Chemical Description and Physical Properties:

needle-like crystals with a characteristic medicinal taste and odor
molecular weight: 163.0
vapor pressure: 133 kPa @ 53°C
molecular formula: C6H4Cl2O
boiling point: 210°C
melting point: 45°C
flash point: 114°C open cup

Incompatibilities: reacts violently with strong oxidants

Health Factors

Carcinogenic Classification:

International Agency for Research on Cancer (IARC): Group 2B, Possibly carcinogenic to humans [381 KB PDF, 171 pages]

Potential Symptoms: Irritation of eyes, nose, throat, skin; cough, sore throat, shortness of breath; eye redness, pain, burns; skin redness, pain, blisters; INGES. ACUTE: Burning sensation, abdominal pain; labored breathing; weakness, tremor, convulsions; shock or collapse; SKIN ABS.

Health Effects: Acute toxicity (HE4); Irritation-Eyes, Nose, Throat, Skin---Marked (HE14).

Affected Organs: Skin, eyes, CNS

Notes:

  1. OSHA does not have a PEL for 2,4-dichlorophenol (2,4-DCP).
  2. EPA's oral reference dose (daily oral exposure likely to be without an appreciable risk of deleterious effects during a lifetime) for 2,4-DCP is 0.003 mg/kg/day.
  3. Skin contact with liquid 2,4-DCP should be treated as a life-threatening medical emergency, as several deaths from accidental splashing or spraying at work have been reported, and there is no known antidote.
  4. The NOAEL for 2,4-DCP in rats that received it orally in their food for 10 weeks was reported to be 33-49 mg/kg/day.
  5. The measurement of urinary 2,4-DCP is not specific for one parent compound, as it can be a metabolite of the organophosphate pesticides, dichlofention and prothiofos, as well as of the organochlorine pesticides, 1,3-dichlorobenzene, bifenox, diclofop, 2,4-dichlorophenoxybutyric acid, dichloroprop, and nitrofen.

Literature Basis:

  • International Chemical Safety Cards (WHO/IPCS/ILO): 2,4-Dichlorophenol.
  • U.S. EPA Integrated Risk Information System: 2,4-Dichlorophenol (CASRN 120-83-2).
  • Aoyama, H., et al.: A two-generation reproductive toxicity study of 2,4-dichlorophenol in rats. J. Toxicol. Sci. 30(Special issue): 59-78, 2005.
  • Center for Disease Control and Prevention: Occupational fatalities associated with 2,4-dichlorophenol (2,4-DCP) exposure, 1980-1998. MMWR Morb. Mortal. Wkly. Rep. 49(23): 516-518, 2000.
  • Mage, D.T., Allen, R.H., Gondy, G., Smith, W., Barr, D.B. and Needham, L.L.: Estimating pesticide dose from urinary pesticide concentration data by creatinine correction in the Third National Health and Nutrition Examination Survey (NHANES-III). J. Expo. Anal. Environ. Epidemiol. 14(6): 457-465, 2004.
  • Pohanish, R.P. (editor): 2,4-Dichlorophenol. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 826-828.

Date Last Revised: 03/29/2007

Monitoring Methods used by OSHA

Bulk Method:

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

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