SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 117840
CASRN 117-84-0
SynonymsDi-n-octyl phthalate
Dioctyl phthalate
1,2-Benzenedicarboxylic acid, dioctyl ester
Analytical Methods EPA Method 606
EPA Method 625
EPA Method 8060
EPA Method 8061
EPA Method 8270
Molecular FormulaC24H38O4

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

Use USED AS A PLASTICIZER IN PLASTICS & RUBBER MATERIALS PLASTICIZER FOR CELLULOSE ESTER RESINS PLASTICIZER FOR POLYSTYRENE RESINS PLASTICIZER FOR VINYL RESINS (EG, POLYVINYL CHLORIDE) Dye carrier Used for film, wire, cables, and adhesives. From table
Consumption Patterns ESSENTIALLY 100% AS A PLASTICIZER
Apparent Color Liquid at room temperature
Boiling Point 220 deg C @ 4 torr
Melting Point -25 deg C
Molecular Weight 390.56
Density 0.978 at 25 deg C
Sensitivity Data IRRITATING TO MUCOUS MEMBRANES .
Environmental Impact Di(n-octyl)phthalate (DNOP) is released into the environment principally in industrial wastewater from its production and use in plasticizers. It will adsorb strongly to sediment and particulate matter and slowly biodegrade with acclimation. The half-life for removal from the aqueous phase was reported to be 5 days in an ecosystem study. It bioconcentrates in algae and other aquatic organisms. The data for fish are contradictory but bioconcentration is probably important in species where little or no metabolism occurs. If di(n-octyl) phthalate is emitted into the atmosphere as an aerosol it will be subject to gravitational settling and photodegradation by hydroxy radicals (estimated half-life 14 hr.). Humans will be exposed to di(n-octyl)phthalate occupationally and possibly from using plastic containers for food that contains DNOP as a plasticizer.
Environmental Fate TERRESTRIAL FATE: If spilled on land di(n-octyl)phthalate (DNOP) will sorb strongly to soil and therefore should not readily leach into the groundwater. However, it has been found in drinking water whose source is groundwater. While di(n-octyl)phthalate is biodegradable, biodegradation is much slower than with dialkyl phthalate esters derived from shorter chain alcohols especially under anaerobic conditions and more acclimation is required. No experimental data could be found containing rates of degradation in soil. AQUATIC FATE: When released into water, di(n-octyl) phthalate (DNOP) will adsorb to sediment and particulate matter in the water column. Di(n-octyl)phthalate will biodegrade although at a slower rate than with shorter chained dialkyl phthalates and acclimation is required. In two sewage treatment plants, no biodegradation was observed at all. In a model terrestrial-aquatic ecosystem, 50% of the di(n-octyl)phthalate disappeared from the water in 5 days. Its fate in groundwater is unknown. However it is quite resistant to anaerobic biodegradation. ATMOSPHERIC FATE: If released into air, di(n-octyl) phthalate will probably be as an aerosol and be subject to gravitational settling. It will be attacked by photochemically produced hydroxyl radicals resulting in an estimated half-life of 13.8 hr. (12/80)] TERRESTRIAL FATE: Phthalates will slowly leach or volatilize from plastics whether in normal use or in landfills. Higher temperature will increase both rates. The presence of organics in water can appreciably increase the rate of leaching (and presumably shift the equilibrium for phthalate adsorbed to soil or sediment toward the aqueous phase). Surfactants, fulvic acid, dispersed fats or oils, or other substances with substantial hydrophobic character are likely candidates for solubilizing phthalates in the environment. Phthalates
Drinking Water Impact DRINKING WATER: Detected, not quantified in 3 aquifer-derived drinking water supplies in Erie County, NY . SURFACE WATER: USA - 14 Heavily industrialized rivers (204 samples) 1 sample > 1ppb, Hudson River Basin 2 ppb . Lake Superior (Red Rock Ontario) 0.7 ppb . Lower Tennessee River below Calvert City, KY (sediment/water sample) - 150 ppb . Unspecified USA river below speciality chemical company 1-20 ppb . 0.1 ug/l; Nipigon Bay, Lake Superior, Ontario. From table Phthalate esters in freshwater & marine sediments is 0.7 ug/kg, Nipigon Bay, Lake Superior, Ontario. From table Phthalate esters in fresh and marine waters: Lake Ontario (lakewide), 2-50 ug/l; Lake Erie (lakewide), 7-6 ug/l; Lake Huron (lakewide), 8-3 ug/l; Lake Superior (lakewide), <0.1 ug/l. From Table; Phthalate esters EFFL: The only industry whose mean effluent level of di(n-octyl) phthalate exceeds 50 ppb is foundries (340 ppb avg, 2800 ppb max) . Di(n-octyl) phthalate was detected at concn of 0.4-1 ppb and 4% detection frequency in urban runoff in Little Rock, AK, Bellvue, WA, and Eugene, OR, 3 of the 19 cities (86 samples) across the USA monitored in the Nationwide Urban Runoff Program . Fort Polk, LA (secondary effluent) - detected, not quantified . 15-55 ug/l; pulp and paper mill effluent. From table

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