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).
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
VAPOR PRESSURE: 0.0133 mmHg at 25 C (pure compound) (26).
SOLUBILITY: Practically insoluble in water (pure compound)
III. HEALTH HAZARD INFORMATION
OSHA STANDARD: NA
NIOSH RECOMMENDED LIMIT: NA
ACGIH RECOMMENDED LIMIT: NA
A. ACUTE TOXICITY
ORAL: LD50 = 1700 mg/kg (rat, technical) (6)
LD50 = >12,000 mg/kg (rat) (26)
B. SUBACUTE AND CHRONIC TOXICITY:
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).
V. EMERGENCY AND FIRST AID PROCEDURES
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
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).
NOTES TO PHYSICIAN:
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
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.
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
IN CASE OF EMERGENCY, CALL, DAY OR NIGHT
PESTICIDE TEAM SAFETY NETWORK/CHEMTREC
X. LITERATURE CITED
6. Farm Chemicals Handbook, 66th ed. 1980. G. L. Berg, C. Sine,
S. Meister, and H. Shephard, eds. Meister Publ. Co.,
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.