SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 119937
CASRN 119-93-7
Synonymso-Tolidine
3,3'-Dimethylbenzidine
[1,1'-Biphenyl]-4,4'-diamine, 3,3'-dimethyl-
Analytical Method EPA Method 553
Molecular FormulaC14H16N2

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

Use VERY SENSITIVE REAGENT FOR DETECTION OF GOLD (1:10 MILLION DETECTABLE); AND FREE CHLORINE IN WATER CHEM INT FOR AZO DYES AND 3,3'-DIMETHYL-4,4'-BIPHENYLENE DIISOCYANATE Curing agent for urethane resins.
Consumption Patterns Over 75% of DMB is used as a dye & as an intermed in the production of dyestuffs & pigments approximately 20% of DMB is used in the production of polyurethane-based high-strength elastomers, coatings, & rigid plastics.
Apparent Color WHITE TO REDDISH CRYSTALS OR CRYSTAL POWDER
Boiling Point 300 DEG C
Melting Point 129-131 DEG C
Molecular Weight 212.28
Sensitivity Data Skin and eye irritant.
Environmental Impact 3,3'-Dimethylbenzidine is used in dyes, as a reagent for gold and for free chlorine in water, and as a curing agent for urethane resins. 3,3'-Dimethylbenzidine released to soil will have a moderate tendency to sorb to organic matter But is expected to covalently bond to humic material like other aromatic amines. Thus leaching should not be rapid in soils. Based upon screening studies biodegradation may be an important degradative process while hydrolysis will not be important. No information was found about volatilization. In water, 3,3'-dimethylbenzidine will have a low tendency to sorb but should covalently bond to sediments. Bioconcentration in aquatic organisms should not be important, because of its low octanol/water partition coefficient. Biodegradation will probably be significant based on screening studies, while hydrolysis will not. No information was found on photolysis or evaporation. An estimated half-life for vapor phase 3,3'-dimethylbenzidine in the atmosphere is 4.0 hours based upon reaction with photochemically generated hydroxyl radicals. Human exposure to 3,3'-dimethylbenzidine may occur from its use in dyes, reagents, and curing agents for urethane resins.
Environmental Fate TERRESTRIAL FATE: 3,3'-Dimethylbenzidine released to soil will have a moderate tendency to sorb to organic matter (estimated Koc is 447) but should covalently bond to humic material in soil. Thus leaching should not be rapid in soils. Biodegradation may be the most important degradative mechanism for 3,3'-dimethylbenzidine in soil based on screening studies . Hydrolysis will probably not be important. No information was found about volatilization from soil surfaces. AQUATIC FATE: 3,3'-Dimethylbenzidine released to water will have a low tendency to bioconcentrate in aquatic organisms (log Kow is 2.34 and estimated BCF is 35) but should covalently bond to humic material in sediment. Biodegradation is probably an important removal process for 3,3'-dimethylbenzidine in water while hydrolysis is not. No information was found on photolysis or evaporation. ATMOSPHERIC FATE: An estimated half-life for 3,3'-dimethylbenzidine in the vapor phase of the atmosphere is 4.0 hours due to reaction with photochemically-produced hydroxyl radicals.

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