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D-D Mixture - Chemical Profile 6/84

                   D-D (Dichloropropane-dichloropropene mixture)

      CHEMICAL NAME:      A 100% mixture of 1,3-dichloropropene,
                          1,2-dichloropropane, 3,3-dichloropropene,
                          2,3-dichloropropene, and other related chlorinated
                          hydrocarbons (56).

      TRADE NAME(S):      D-D, Nemafene (56)

      FORMULATION(S):     100% liquid mixture of 3 chemicals.  Sometimes
                          mixed with allyl alcohol (herbicide) or
                          chloropicrin (48).

      TYPE:               Soil fumigant-nematicide

      BASIC PRODUCER(S):  Shell Chemical Co.
                          Agricultural Chemicals
                          P.O. Box 3871
                          Houston, TX 77001

      STATUS:             General use

      PRINCIPAL USES:     Controlled dosages are injected into the soil where
      D-D provides fumigant action against plant parasitic nematodes,
      symphylids, and wireworms on a broad range of crops; also preplant
      treatment to control bacterial canker and decline of peach trees, for
      suppression of verticillium wilt, and to control quackgrass in fields
      to be planted to white potatoes in northwestern states, for reduction
      of damaging effects of verticillium wilt in disease-infected land to be
      used for mint production in northwestern states, and as treatment to aid
      in control of field bindweed (perennial morningglory) on bare ground

                                   I.  EFFICACY

           Effective against soil nematodes including root knot, meadow,
      sting and dagger, spiral and sugar beet nematodes (26).
           Pests controlled:  cyst (soybean, golden, tobacco, sugar beet),
      root knot, root lesion or meadow, burrowing, citrus, stem and bulb,
      free living (sting, ring, awl, spiral, lance, pin, stubby-root, stylet,
      dagger), and other plant parasite nematodes, symphylids and wireworms

                             II.  PHYSICAL PROPERTIES

      MOLECULAR FORMULA:  Mixture of C3 H4 Cl2 and C3 H6 Cl2 (principal
                          constituents) (18g).

      PHYSICAL STATE:     Clear amber liquid (pure compound) (26)

      ODOR:               Pungent, garlic-like (18g)

      BOILING POINT:      Approximately 217-340 F (with decomposition) (18g)

      VAPOR PRESSURE:     35 mmHg at 20 C (pure compound) (26)

      SOLUBILITY:         c. 2g/kg water at room temperature (pure compound)

                          III.  HEALTH HAZARD INFORMATION



      ACGIH RECOMMENDED LIMIT:  For dichloropropene (a major constituent of
                                D-D):  TWA (Time Weighted Average) = 1 ppm, 5
                                mg/m3; STEL (Short Term Exposure Limit) = 10
                                ppm, 50 mg/m3.  Skin notation (15a).


           A.  ACUTE TOXICITY

               DERMAL:    LD50 = 2100 mg/kg (rabbit).  It is irritant to
                          human skin (26).

               ORAL:      LD50 = 140 mg/kg (rat); 300 mg/kg (mice) (26).

               INHALATION:  LC50 = 1000 ppm (4 hr. exposure, rat) (18g).



           Animals repeatedly exposed to D-D vapors showed liver and kidney
      injury (18g).
           See 1,3-dichloropropene.

                        IV.  ENVIRONMENTAL  CONSIDERATIONS

           Toxic to plants and germinating seeds (48).
           Does not accumulate in soil even after several annual
      applications.  May reduce nitrifying microorganisms in cold soils and
      thereby change the nitrogen cycle (18g).
           No hazard to wildlife when applied according to recommendations on
      the product label (18g).
           See 1,3-dichloropropene.


           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.


           Oral:  Acute gastrointestinal distress, with congestion and edema
      of lungs.
           Inhalation:  Gasping, refusal to breathe, and extreme respiratory
      distress at concentrations over 1,500 ppm.  Eye and upper respiratory
      irritation appears soon after exposure to vapors.  Repeated exposure
      may give rise to central nervous system depression.
           Dermal:  Severe skin irritation with marked inflammation of skin
      and mucous membranes (18g).

           SKIN CONTACT:  If on skin, immediately flush skin with plenty of
      water for 15 minutes while removing contaminated clothing and shoes or
      boots.  If water is not immediately available, remove excess chemical
      from skin with sorbent material such as a towel or dry soil, then
      proceed at once to a location where water is available.  Get medical
      attention (18g).

           INGESTION:     IF SWALLOWED, call a physician, poison control
      center, or hospital emergency room immediately and follow the
      directions given.  If medical advice is not available, induce vomiting.
      DROWSY PERSON.  To induce vomiting, give one or two glasses of water
      followed by two tablespoons (30 cc or one ounce) Syrup of Ipecac.   For
      a child, give one glass of water followed by one tablespoon (15 cc or
      one-half ounce) Syrup of Ipecac.  If Ipecac is not available, give two
      glasses of water (one glass for a child) and induce vomiting by
      touching finger to back of victim's throat.  Keep victim's head below
      hips while vomiting.  After vomiting has occurred, get medical
      attention.  If you are not successful at inducing vomiting, get medical
      attention immediately.  Do not waste time with further attempts (18g).

           INHALATION:    If inhaled, remove to fresh air.  If not breathing,
      give artificial respiration, preferably mouth to mouth.  If breathing
      is labored, give oxygen.  Get medical attention (18g).

           EYE CONTACT:   If in eyes, immediately flush eyes with water for
      15 minutes.  Get medical attention immediately (18g).


           There is no specific antidote for D-D intoxication (18g).

                        VI.  FIRE AND EXPLOSION INFORMATION

      GENERAL:  Flammable (56)

                                VII.  COMPATIBILITY

           Compatible with other fumigants (48).

                            VIII.  PROTECTIVE MEASURES

      STORAGE AND HANDLING:  D-D must be kept away from heat or open-flame
      (18g).  Hazardous by ingestion, inhalation, or by skin absorption.
      Although toxic to warm-blooded animals, the vapors provide a warning
      of the presence of D-D.  Store in cool place away from dwellings.  Do
      not cut or weld container.  Do not store in or use containers or
      equipment made of aluminum, magnesium, or their alloys (56).

      PROTECTIVE CLOTHING:  When handling or working with D-D wear clean
      body covering including polyethylene, neoprene, or rubber footwear;
      wear eye protection such as chemical workers' goggles (56).

      PROTECTIVE EQUIPMENT:  NIOSH or MESA approved respiratory equipment
      should be worn when liquid D-D is exposed to the atmosphere (56).

                       IX.  PROCEDURES FOR SPILLS AND LEAKS

                                  (800) 424-9300

                               X.  LITERATURE CITED

      15a. American Conference of Governmental Industrial Hygienists.  1983.
               TLVs:  threshold limit values for chemical substances and
               physical agents in the work environment with intended changes
               for 1983-84.  Cincinnati, OH.  93 pp.

      18g. Shell Chemical Company, Agricultural Chemicals.  1982.
               Technical data bulletin:  summary of basic data for
               D-D soil fumigant.  Houston, TX.

      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.