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EC number: 701-028-2 | CAS number: -
Water solubility
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
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