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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Water solubility

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Administrative data

Link to relevant study record(s)

Description of key information

It is not possible to measure TNPP in water.  A new study (VU 2021) which employed TNPP packed in a generator column (per OECD 105) could not generate a measurable concentration of  TNPP in order to conduct a hydrolysis study of TNPP.  This study used an analytical method for measuring TNPP with an LOQ of 0.05 mg.L-1 (same as prior work by TNO).  This is the value used in the October 2008 draft EU RAR for quantitative assessment and has thus be used in the REACH registration. It is likely that the true water solubility limit of TNPP is much lower than this value. The October 2008 draft RAR included a sensitivity analysis for water solubility and found the range to be between 0.05 and 3x10-16 mg/L. The lower end of this range comes from modelled results using WSKOW and a range of log Kow values. 

Key value for chemical safety assessment

Water solubility:
50 µg/L
at the temperature of:
24 °C

Additional information