| Chemical Abstract Number (CAS #) |
117840
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| Synonyms | Di-n-octyl phthalate |
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Dioctyl phthalate | 1,2-Benzenedicarboxylic acid, dioctyl ester |
| Analytical Methods |
EPA Method 606 |
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EPA Method 625 |
EPA Method 8060 |
EPA Method 8061 |
EPA Method 8250A |
| Molecular Formula | C24H38O4 |
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| 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
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| Consumption Patterns | ESSENTIALLY 100% AS A PLASTICIZER
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| Apparent Color | Liquid at room temperature
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| Boiling Point | 220 deg C @ 4 torr
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| Melting Point | -25 deg C
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| Molecular Weight | 390.56
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| Density | 0.978 at 25 deg C
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| Sensitivity Data | IRRITATING TO MUCOUS MEMBRANES .
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| 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.
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| 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
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| 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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