SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 126727
CASRN 126-72-7
SynonymsTris(2,3-dibromopropyl)phosphate
1-Propanol, 2,3-dibromo-, phosphate
Molecular FormulaC9H15Br6O4P

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

Use SRP: FORMER USES: IT HAS BEEN RECOMMENDED FOR USE IN PHENOLIC RESINS, PAINTS, PAPER COATINGS AND RUBBER. TRIS(2,3-DIBROMOPROPYL) PHOSPHATE IS USED MAINLY IN POLYESTER AND CELLULOSIC ACETATE FABRICS, BUT IT HAS ALSO BEEN USED IN ACRYLIC FABRICS. IT MAY BE ADDED TO TEXTILES BY THE PRODUCER, ALTHOUGH ADDN BY DYERS AND FINISHERS IS BELIEVED TO BE MORE USUAL, AT A LEVEL OF 6-10% BY WT. ITS ADDN TO POLYURETHANE FOAMS IS THE MAJOR USE IN PLASTICS; RELATIVELY SMALL AMOUNTS ARE BELIEVED TO BE USED AS AN ADDITIVE TO POLYSTYRENE FOAM. RIGID FOAMS CONTAINING TRIS(2,3-DIBROMOPROPYL) PHOSPHATE ARE USED IN INSULATION, FURNITURE, AUTOMOBILE INTERIOR PARTS AND WATER FLOATATION DEVICES. Highly active flame retardant used in clear cast acrylic sheet, lacquers, styrene-butadiene rubber (SBR), latexes, and cured unsaturated polyesters. tris(2,3-dibromo-1-propyl) phosphate (TRIS) is no longer used in the United States. Major uses for TRIS were in plastics and flame retardant additive used in children's nightwear. Other applications included the treatment of packaging, draperies, institutional bedding, toys, doll clothing, and wigs.
Apparent Color VISCOUS, PALE YELLOW LIQUID; Dense, nearly colorless liquid
Melting Point FP: 5.5 DEG C
Molecular Weight 697.93
Density 2.27 AT 25 DEG C
Environmental Impact Tris(2,3-dibromopropyl) phosphate (TRIS) is not currently produced or used in the United States but was used as a flame retardant in plastics and synthetic fibers. Environmental release in the past has been shown to result from textile finishing plants and laundering of the finished product. Based on the high estimated soil sorption coefficient, TRIS is expected to leach only slowly to groundwater when released to soil. Since TRIS possesses six bromine atoms, hydrolysis is expected to occur at the alkyl bromide position at a significant rate upon release to water and soil especially under basic conditions. Volatilization from water may also occur. Biodegradation of TRIS occurs in activated sludge, but no data were available regarding biodegradation in natural soils and waters. Photolysis of TRIS in soil and water is not expected to be important. Because of its low vapor pressure, TRIS is expected to be mostly sorbed to particulate matter in air and removed from the atmosphere by gravitational settling. The estimated half-life for the reaction of vapor phase TRIS with atmospheric photochemically generated hydroxyl radicals is 3.74 days. Tris(2,3-dibromopropyl) phosphate has been detected but not quanitified in soil and air particulate matter collected in Arkansas.
Environmental Fate TERRESTRIAL FATE: An estimated log Koc (3.29) suggests strong adsorption to soil . Based on this Koc value and the low measured water solubility of the technical chemical (8.0 mg/l, tris(2,3-dibromopropyl) phosphate (TRIS) is expected to leach only slowly to groundwater. The water solubility of pure TRIS may be lower than the solubility of the technical grade chemical and so the extent of leaching of the pure chemical may be even lower than the Koc above suggests. No data on the biodegradation or photolysis of TRIS in the soil were available. AQUATIC FATE: A biodegradation half-life of 19.7 hours was obtained for tris(2,3-dibromopropyl) phosphate (TRIS) in a laboratory activated sludge system at 21 deg C. No data concerning the biodegradation of TRIS in natural waters were available. Phosphoric acid methyl and ethyl esters slowly hydrolyze at pH 7 and 25 deg C . The longer alkyl group of tris(2,3-dibromopropyl)phosphate would be expected to impart an even longer half-life to TRIS. Although hydrolysis of the phosphate ester is not expected to be significant, hydrolysis involving the bromide atoms on the propyl groups may occur, especially under basic conditions. ATMOSPHERIC FATE: Because of its low vapor pressure tris(2,3-dibromopropyl) phosphate (TRIS) is expected to be mostly sorbed to particulate matter in the atmosphere and therefore would be susceptible to removal by gravitational settling. An atmospheric half-life of 3.74 days has been estimated for the reaction of the vapor phase (TRIS) with hydroxyl radicals. No data on the photolysis of TRIS were available. Direct photolysis is not expected to be a major fate process since TRIS should not absorb sunlight.

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