SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 131113
CASRN 131-11-3
SynonymsDimethyl phthalate
1,2-Benzenedicarboxylic acid, dimethyl ester
Analytical Methods EPA Method 525.2
EPA Method 606
EPA Method 625
EPA Method 8060
EPA Method 8061
EPA Method 8270
Molecular FormulaC10H10O4

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

Use SOLVENT & PLASTICIZER FOR CELLULOSE ACETATE & CELLULOSE ACETATE-BUTYRATE COMPOSITIONS FOR MAKING VARNISHES & CLEAR WHITE OR SLIGHTLY COLORED CLEAR FILMS WHICH MAY BE EXPOSED TO THE SUN IN SOLID ROCKET PROPELLANTS, LACQUERS, COATING AGENTS, SAFETY GLASS, MOLDING POWDERS & PERFUMES SINCE WORLD WAR II HAS BEEN USED EFFECTIVELY AS A MOSQUITO & INSECT REPELLANT. IT IS A PLASTICIZER FOR POLYVINYL ACETATE & HAS A GELLING ACTION ON POLYVINYL CHLORIDE, VINYL CHLORIDE-VINYL ACETATE COPOLYMERS, POLYVINYL ACETAL, & POLYSTYRENE. IT IS COMPATIBLE WITH ACRYLIC RESINS & RUBBERS, IMPROVING THEIR PLASTICITY. PLASTICIZER FOR CELLULOSE ESTER PLASTICS DISPERSING MEDIUM, EG, DYE CARRIER PLASTICIZER IN HAIR SPRAY Cosmetic ingredient. Leech repellant. Used in fuel matrix of double base rocket propellant, fluidized bed coating in manufacture of poly(vinylidene fluoride); plasticizer in cellulose acetate and nitrocellulose, resins, rubber; constituent of rubber. AN EFFECTIVE REPELLANT FOR FLEAS & CHIGGERS. AS REPELLANT FOR FLIES ON HORSES & COWS. MITICIDAL AGENT FOR TREATMENT OF RICKETTSIAL INFECTIONS APPLICATIONS (VET): OVERRATED AS A MITICIDE- CAREFUL LABEL READING WILL OFTEN REVEAL THAT SUCH CLAIMS ARE IMPLIED ONLY & ARE QUESTIONABLE. EFFECTIVENESS AGAINST MANGE MITES HAS ALSO BEEN CLAIMED & QUESTIONED.
Consumption Patterns USED ALMOST ENTIRELY AS A PLASTICIZER IN CELLULOSE ESTER PLASTICS.
Apparent Color OILY-LIQUID; COLORLESS VISCOUS LIQUID AT ROOM TEMP; Pale yellow crystals
Odor Slight ester odor; SLIGHT AROMATIC ODOR
Boiling Point 283.7 DEG C @ 760 MM HG
Melting Point 5.5 DEG C
Molecular Weight 194.19
Density 1.196 @ 15.6 DEG C/15.6 DEG C; 1.1940 @ 20 deg C/20 deg C; 1.189 @ 25 deg C/25 deg C
Sensitivity Data Irritation of nasal passages and upper respiratory system; eye pain. Overexposure to hot vapors or mists of dimethyl phthalate may cause irritation of the nasal passages, mouth and throat. Eye contact with liquid dimethyl phthalate causes pain.
Environmental Impact Dimethyl phthalate (DMP) is released into the environment principally in industrial wastewater from its production and use as a plasticizer and mosquito repellent. Its primary loss mechanism appears to be biodegradation. Half-lives of 8-11 days and 0.2 days has been determined in river water, but no half-lives are available for soil or groundwater although dimethylphthalate is utilized by soil microorganisms and degrades under anaerobic conditions. Little adsorption to soil or sediment will occur. Dimethyl phthalate will not bioconcentrate in fish. If dimethyl phthalate is emitted into the atmosphere it will most likely be as an aerosol and it will be subject to rainout and gravitational settling. Photodegradation by hydroxyl radicals will also occur (estimated half-life 23.8 hr). Humans will be exposed to dimethyl phthalate occupationally and from continued use of mosquito repellent.
Environmental Fate TERRESTRIAL FATE: If spilled on land, dimethyl phthalate should weakly sorb to most soils unless the soil has a very high organic content. Therefore, leaching through most soils to groundwater is expected. It is readily biodegraded, especially after a short period of acclimation; however, no data could be found for environmental samples. AQUATIC FATE: If released into water, dimethyl phthalate (DMP) will primarily remain in the water column since it weakly sorbs to soil and sediment. Biodegradation will be the principal loss process in fresh water with a half-life of <11 days in river water. However based on concentration measurements between sampling points on the Rhine River, the half-life was determined to be only 0.2 days . The rate of biodegradation in sea water is much longer. Although DMP biodegrades under anaerobic conditions, its fate in groundwater is unknown. In situations where biodegradation is less important, other loss processes may be significant such as volatilization (shallow oligotrophic lakes or salt water bays), hydrolysis (alkaline bodies of water), and photolysis (clear surface waters), although data for the latter process are conflicting. ATMOSPHERIC FATE: If released into air, dimethyl phthalate will most probably exist 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 23.8 hr.
Drinking Water Impact DRINKING WATER: Detected in three New Orleans drinking water plants 0.13-0.27 ppb . Philadelphia drinking water but not quantified . Kitakyushu, Japan tap water but not quantified . Detected in treated drinking water from 6 of 14 sites tested in England, 5 drinking water sites were from rivers and 1 was from a groundwater source(6). SURFACE WATER: Merrimack River, Detected, but not quantified . Rhine River at Lobith, The Netherlands 0.3 ppb(7). OTHER: Norway-detected, not quantified in the water phase of rain and snow . EFFL: Mean effluent levels greater than 100 ppb occur from foundries (280 ppb), metal finishing (200 ppb), and the organic chemicals manufacturing plastics (510 ppb) industries . Industries whose maximum effluent levels exceeded 1000 ppb were: Metal finishing (1200 ppb), foundries (3200 ppb), and nonferrous metals manufacturing (1300 ppb) . Dimethyl phthalate was not detected in urban runoff in the Nationwide Urban Runoff Program which included 86 samples from 19 cities across the USA . Fort Polk, La (secondary effluent) 0.77 ppb . Lake Superior-effluent from pulp and paper mill-detected as minor component .

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