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pentachloronitrobenzene (Terraclor) Chemical Profile 1/85


      CHEMICAL NAME:      Pentachloronitrobenzene (6)

      TRADE NAME(S):      PCNB, Terraclor, Terra-Coat L205 (48)

      FORMULATION(S):     Wettable powder, 2 emulsifiable concentrate, dust,
                          pastes, 10% granules.  Most often found in
                          combination with other pesticides (48).
                          RTU PCNB is a "ready-to-use" formulation of 24.0%
                          or 2.23 lbs./gal. pentachloronitrobenzene (56).

      TYPE:               Organochlorine fungicide

      BASIC PRODUCER(S):  Olin Corp.
                          P.O. Box 991
                          Little Rock, AR 72203

      STATUS:             General use.  RPAR issued 10/13/77, comment
                          period closed 2/6/78.  Criteria possibly met or
                          exceeded:  oncogenicity.  RPAR terminated 4/19/82
                          through negotiated agreement with registrants to
                          reduce levels of the HCB contaminant and to make
                          label changes to reduce exposure (22).

      PRINCIPAL USES:  Soil application against a wide variety of diseases
      on vegetables, field crops and ornamentals (48).  Used for damping-off
      of cotton; black-root and club-root of cabbage, cauliflower, Brussels
      sprouts, and broccoli; scab and Rhizoctonia of potatoes; southern
      stem and root rot of peanuts; southern blight of tomatoes and
      peppers; root and stem rot and white mold of beans; white rot of
      garlic; bunt of wheat; botrytis storage rot of roses; brown patch
      of lawns; petal blight of azaleas; root rot of Easter lilies;
      flower blight of camellia; stem rot of various ornamentals; and
      crown and black rot of bulbous ornamentals (56).
           RTU PCNB designed for protection of small grains against covered
      smut and oat smut, common smut or bunt, damping-off, seed rot and
      early stages of preemergence damping-off caused by Rhizoctonia (56).

                                   I.  EFFICACY

           Soil pH has little effect on the residual effectiveness (48).

                             II.  PHYSICAL PROPERTIES

      MOLECULAR FORMULA:  C6 Cl5 NO2 (26)

      MOLECULAR WEIGHT:   295.3 (26)

      PHYSICAL STATE:     Colorless needles (pure compound) (26)

      MELTING POINT:      146 C (pure compound); 142-145 C (technical
                          product) (26).

      VAPOR PRESSURE:     0.0133 mmHg at 25 C (pure compound) (26).

      SOLUBILITY:         Practically insoluble in water (pure compound)

                          III.  HEALTH HAZARD INFORMATION





           A.  ACUTE TOXICITY

               ORAL:   LD50 = 1700 mg/kg (rat, technical) (6)
                       LD50 = >12,000 mg/kg (rat) (26)


           In 2-yr. feeding trials rats receiving 2500 mg/kg diet survived

                        IV.  ENVIRONMENTAL  CONSIDERATIONS

           Some hazard to fish and wildlife.  Generally nonphytotoxic,
      although slight burning has been reported in young lettuce.  Injury to
      some vegetables at excessive dosages (48).

           It is highly stable in soil (26).


           The chemical information provided below has been condensed
      from original source documents, primarily from "Recognition and
      Management of Pesticide Poisonings", 3rd ed. by Donald P.  Morgan,
      which have been footnoted.  This information has been provided in
      this form for your convenience and general guidance only.  In
      specific cases, further consultation and reference may be required
      and is recommended.  This information is not intended as a sub-
      stitute for a more exhaustive review of the literature nor for the
      judgement of a physician or other trained professional.

           If poisoning is suspected, do not wait for symptoms to develop.
      Contact a physician, the nearest hospital, or the nearest Poison
      Control Center.

      KNOWN OR SUSPECTED ADVERSE EFFECTS:  Skin irritant (25).

           SKIN CONTACT:  Wash contaminated skin with soap and water (25).

           INGESTION:  Ingestions of small amounts (less than 10 mg/kg
      body weight) occurring less than an hour before treatment, are probably
      best treated by:  Syrup of Ipecac, followed by 1-2 glasses of water.
      Dose for adults and children over 12 years:  30 ml.  Dose for children
      under 12 years:  15 ml (25).

           EYE CONTACT:   Flush contaminated eyes with copious amounts of
      fresh water for 15 minutes (25).


      INGESTIONS of LARGE amounts (more than 10 mg/kg) occurring less than an
      hour before treatment, should probably be treated by gastric lavage:
      A.   INTUBATE stomach and ASPIRATE contents.
      B.   LAVAGE stomach with slurry of ACTIVATED CHARCOAL in 0.9% saline.
           Leave 30-50 gm activated charcoal in the stomach before
           withdrawing tube.
      C.   SODIUM SULFATE, 0.25 gm/kg in tap water, as a cathartic.
           CAUTION:  Hydrocarbons (kerosene, petroleum distillates) are
                     included in some formulations of these chemicals.
                     Ingestions of very LARGE AMOUNTS may cause CNS
                     depression.  In this case, IPECAC IS CONTRAINDICATED.
                     Also, gastric intubation incurs a risk of HYDROCARBON
                     PNEUMONITIS.  For this reason observe the following
                     (1)  If the victim is unconscious or obtunded and
                          facilities are at hand, insert an ENDOTRACHEAL TUBE
                          (cuffed, if available) prior to gastric intubation.
                     (2)  Keep victim's HEAD BELOW LEVEL OF STOMACH during
                          intubation and lavage (Trendelenburg, or left
                          lateral decubitus, with head of table tipped
                          downward).  Keep victim's head turned to the left.
                     (3)  ASPIRATE PHARYNX as regularly as possible to remove
                          gagged or vomited stomach contents.
      INGESTIONS occurring MORE THAN an HOUR before treatment are probably
      best treated only by ACTIVATED CHARCOAL, 30-50 gm and SODIUM or
      MAGNESIUM SULFATE, 0.25 gm/kg, as described above.
      There are no specific antidotes for these chemicals.  Because
      manifestations of toxicity do occasionally occur in peculiarly
      predisposed individuals, MAINTAIN CONTACT with victim for at least 72
      hours so that unexpected adverse effects can be treated promptly (25).

                        VI.  FIRE AND EXPLOSION INFORMATION

           To be developed.

                                VII.  COMPATIBILITY

           Compatible with other fungicides and insecticides except those
      alkaline in reaction.  Noncorrosive with low volatility (48).

                            VIII.  PROTECTIVE MEASURES

      STORAGE AND HANDLING:  Store in a cool dry place (56).

                       IX.  PROCEDURES FOR SPILLS AND LEAKS

                                  (800) 424-9300

                               X.  LITERATURE CITED

       6.  Farm Chemicals Handbook, 66th ed.  1980.  G. L. Berg, C. Sine,
               S. Meister, and H. Shephard, eds.  Meister Publ. Co.,
               Willoughby, OH.

      22.  U.S. Environmental Protection Agency, Office of Pesticide
               Programs.  1983.  June 1983 status report on rebuttable
               presumption against registration (RPAR) or special review
               process, registration standards and the data call in
               programs.  Washington, DC.  45 pp.

      25.  Morgan, D.P.  1982.  Recognition and management of
               pesticide poisonings, 3rd ed.  U. S. Environmental Protection
               Agency, Washington, DC.  120 pp.

      26.  The Pesticide Manual:  A World Compendium, 6th ed.  1979.  C. R.
               Worthing, ed.  The British Crop Protection Council, Croydon,
               England.  655 pp.

      48.  Harding, W.C.  1979-80.  Pesticide profiles, part two:  fungicides
               and nematicides.  Univ. Maryland, Coop. Ext. Service Bull.
               283, 22 pp.

      56.  Farm Chemicals Handbook, 70th ed.  1984.  R. T. Meister, G. L.
               Berg, C. Sine, S. Meister, and J. Poplyk, eds.  Meister
               Publishing Co., Willoughby, OH.