SPECTRUM

Chemical Fact Sheet

117-80-6
Chemical Abstract Number (CAS #) 117806
CASRN 117-80-6
SynonymsDichlone
Phygon
1,4-Naphthoquinone, 2,3-dichloro-
Analytical Method EPA Method 8081
Molecular FormulaC10H4Cl2O2

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use SEED DISINFECTANT; FUNGICIDE FOR FOLIAGE AND TEXTILES; INSECTICIDE; ORGANIC CATALYST. EFFECTIVE SUBSTITUTE FOR BOTH SULFUR & COPPER IN CONTROL OF VARIOUS FUNGUS DISEASES OF FRUIT TREES & ON VEGETABLES. Used to control blue-green algae in ponds, lakes, and swimming pools. /FORMER USE: CHEM INT-EG, FOR DIATHIANON. /Treatment for fruit, vegetable, field crops, ornamentals, resident/commercial outdoor areas. For brown rot of stone fruit; scab on apples, pears; blossom blights.
Consumption Patterns (1975): 9.1X10 7 g. (1978): 9.1X10 7 g, est to have been exclusively for seed treatment of vegetables, mainly tomatoes, peas, and beans. APPLES, 67%; OTHER DECIDUOUS FRUIT & SEED TREATMENT, 33% (1982 FUNGICIDE USE)
Apparent Color GOLDEN YELLOW NEEDLES OR LEAFLETS FROM ALCOHOL.
Boiling Point 275 DEG C AT 2 MM HG
Melting Point 195 DEG C
Molecular Weight 227.05
Sensitivity Data ONE SERIOUS DRAWBACK TO ITS USE IS THE FACT THAT THE CHEMICAL MAY CAUSE SKIN IRRITATION. IRRITATING TO MUCOUS MEMBRANES. OCCUPATIONAL EXPOSURE OF HUMANS TO DUST OF 2,3-DICHLORO-1,4-NAPHTHOQUINONE IN CONCN OF 0.7-6 MG/CU M CAUSED EYE IRRITATION.
Environmental Impact Dichlone may be released to the air or in wastewater during its formulation and use as a fungicide on fruits, vegetables, field crops and seed as well as for treating textiles and as a catalyst. It is no longer produced in the US. If emitted to the air it will generally be in the form of aerosol and dust and be subject to gravitational settling as well as photooxidation by ozone and hydroxyl radical (estimated half-life in the vapor 1.25 hr). If released into water it will hydrolyze with a half-life of 5 days at neutral pH and faster at alkaline pHs. Photodegradation will also occur in surface waters but the rate of degradation could not be found. Degradation will be fast in moist soil (half-life 1 day) but somewhat slower in dry soil (half-life of months). In field application, it will degrade during the growing season and not leach below about 6 inches. Human exposure will primarily be occupational to agricultural and industrial workers who use this chemical.
Environmental Fate TERRESTRIAL FATE: In a field test, the results of which were somewhat erratic due to lack of analytical sensitivity, dichlone applied to an apple orchard soil declined in concentration during the growing season and was not detected in the soil the following year. During the growing season, some dichlone was detected 4-6 inches below the surface . Dichlone degrades in moist and air-dried soil with half-lives of 1 day and somewhat under 3 months, respectively . AQUATIC FATE: When released into water, dichlone will hydrolyze with a half-life of 5 days at neutral pH. Hydrolysis will be faster at alkaline pH. It will also slowly photodegrade, however no rate for this process could be found. ATMOSPHERIC FATE: Dichlone emitted to the air will be largely as dust or aerosols and be subject to gravitational settling. It will also be subject to photodegradation in the vapor phase with an estimated half-life of 1.25 hr.

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