|Chemical Abstract Number (CAS #)||
||EPA Method 8270 |
Link to the National Library of Medicine's Hazardous Substances
Database for more details
on this compound.
|Use|| CHEM INTERMED FOR BENZIDINE, AN INTERMED FOR DYES, IN SYNTHESIS
OF PHENYLBUTAZONE (ANTIARTHRITIC DRUG)
Antisludging additive to motor oil, evaluated as agent for insecticidal and insecticidal
synergistic activity, desuckering agent for tobacco plants, reductant in reclamation of rubber,
component of experimental organometallic polymers, use in photochromic resin compositions, in
In mfr of hydrogen peroxide
Some hydroazobenzene derivatives are used as flame-retardant agents. Hydrazobenzene
|Apparent Color|| TABLETS FROM ALCOHOL & ETHER
|Melting Point|| 131 DEG C
|Molecular Weight|| 184.24
|Density|| 1.158 AT 16 DEG C/4 DEG C
|Odor Threshold Concentration|| The warning properties (irritation & odor) of the hydrazines are probably sufficient to
prevent acute poisoning from short exposures. However, in view of the chronic toxicity
properties, the warning properties should not be considered adequate for prolonged exposures.
They have median detectable odor levels of 1 to 10 ppm, but these levels are levels above all
the TLVs adopted for hydrazines except phenylhydrazine. Hydrazines
|Environmental Impact|| Hydrazobenzene may be released into the environment during its production and use as a
chemical intermediate. Available data on its use suggests that its production is very limited.
Hydrazobenzene is in rapid redox equilibrium with azobenzene and under most conditions it will
be quickly converted to it (half life a few minutes) by air, cations such as copper(II) etc.
Degradation will also result from photolysis and possibly biodegradation but these processes
would not compete with oxidation under most conditions. It will also adsorb moderately to soil,
sediment and particulate matter which may increase the oxidation rate by facilitating contact with
environmentally prevalent cations which catalyze its oxidation. Human exposure will be primarily
|Environmental Fate|| TERRESTRIAL FATE: If spilled on land hydrazobenzene would adsorb moderately to
soil and be oxidized to azobenzene by air or cations in the soil.
AQUATIC FATE: If released in water hydrazobenzene will adsorb moderately to sediment and
particulate matter. It undergoes rapid reversible oxidation by dissolved oxygen and
environmentally common cations (eg copper(II)) to azobenzene and will be converted to
azobenzene in aerobic waters. Azobenzene and perhaps hydrazobenzene as well will be
photolyzed in surface water. Hydrazobenzene is apparently biodegradable but this process would
not compete with oxidation under aerobic conditions.
ATMOSPHERIC FATE: If released in the atmosphere hydrazobenzene will degrade by a
combination of air oxidation and photolysis. No rates of oxidation or photolysis could be found
but available information suggests that degradation will be rapid.
AQUATIC FATE: 1,2-Diphenylhydrazine rearranges intramolecularly to benzidine in aq acid.
Although the concn of aq acid that is necessary for this reaction is unlikely to be found in ambient
surface waters, this rearrangement can proceed easily in presence of anionic micelles such as
would be formed from commercial laundry detergents.
|Drinking Water Impact|| DRINKING WATER: Detected, not quantified in finished drinking water .
1,2-Diphenylhydrazine has been found to be present in drinking water at levels of 1 ug/l= 1 ppb.
GROUNDWATER: Hydrazobenzene was detected in groundwater samples at Love Canal,
Niagara Falls, NY .
EFFL: Hydrazobenzene was detected in 1.2% of 1,205 effluents sampled in a national survey at
a median concn less than 10 ug/l .