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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Physical & Chemical properties

Partition coefficient

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partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Principles of method if other than guideline:
Method: other (measured): Monsanto Environmental Sciences method ES-79-M-15: Log Kow of the substance was measured by equilibrating aqueous solutions of radiolabelled compounds with n-octanol. The concentrations of the substance in each phase were determined by Liquid Scintillation Counting (LSC).
GLP compliance:
Type of method:
other: equilibrating aqueous solutions of radiolabelled compounds with n-octanol
Partition coefficient type:
Key result
log Pow
Partition coefficient:
Remarks on result:
other: Temperature and pH not stated

Test concentration 
Kow 50 mg/l      4.46 x 10-4
500 mg/l         3.49 x 10-4

Test concentrations are expressed as active acid.

Kow values of 4.46E-4 and 3.49E-4 were was determined at 100 ppm and 1000 ppm respectively in a reliable study conducted according to generally accepted scientific principles.

Description of key information

Partition coefficient: log Kow -3.4

Key value for chemical safety assessment

Log Kow (Log Pow):

Additional information

A log Kow value of -3.4 was determined for DTPMP-H in a reliable study conducted according to a generally accepted scientific principles. The result is considered to be reliable and has been assigned as key study.

Another log Kow value of -8.2 was reported for DTPMP-H using atom fragment contribution method. The fragment coefficients are supported by a collection of reliable data. Therefore, the calculated result is considered to be suitable for supporting study.