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EC number: 216-407-3
CAS number: 1576-35-8
p-TSH is not readily biodegradable according to OECD Guideline no. 301C.
The hydrolytic half life of p-TSH at 20 °C was:
138.63 h at pH 4
38.51 h at pH 7
40.77 h at pH 9
These data suggest that p-TSH will degrade hydrolytically at
environmentally relevant pH and temperature conditions. The primary
degradation products are hydrazine and p-Toluenesulfonic acid.
Once released into the water environment, p-TSH will readily - due to
hydrolysis - be degraded into primarily hydrazine and p-Toluenesulfonic
Some retention of the waste water within in the industrial settings can
be expected. The travelling time from p-TSH is released into waste water
until arrival in the STP can vary quite much - in dependence of the
distance to plant and the flow velocity. Typically, the flow velocity in
the sewer is about 1 m/s, and with an average distance between the point
of discharge and STP of 10 km, a retention time in the sewer of
approximately 3 hours is calculated. In the sewer, a pH above 7 is usual
(in order to limit the concentration of free H2S and to limit
the corrosion due to the presence of sulfuric acid).
The overall retention time in a standard SimpleTreat sewage treatment
plant (STP) is approximately 15 hours. Overall, a total retention time
of 1 day = 24 hours is assessed to be a reasonable value to apply for
the risk assessment. A pH between 7 - 8 is expected in the sewer and the
sewage treatment plant.
In conclusion, a total hydrolytic transformation of approximately 65%
before final discharge into the environment is assessed to be a
reasonable value to use for the environmental risk assessment.
The hydrolytic half life of p-TSH at 20 degrees celcius was:
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