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Physical & Chemical properties

Partition coefficient

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Link to relevant study record(s)

Reference
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Remarks:
comparable method to OECD guideline, but with some information not present.
Principles of method if other than guideline:
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 concentration of the substance in each phase was determined by Liquid Scintillation Counting (LSC).

GLP compliance:
no
Type of method:
other: equilibrating aqueous solutions of radiolabelled compounds with n-octanol
Partition coefficient type:
octanol-water
Analytical method:
other: Liquid scintillation counting
Key result
Type:
log Pow
Partition coefficient:
-4.1
Remarks on result:
other: No information on pH and temperature stated. Test concentration is 100 ppm
Key result
Type:
Pow
Partition coefficient:
0
Remarks on result:
other: No information on pH and temperature stated. Test concentration is 100 ppm
Key result
Type:
log Pow
Partition coefficient:
0
Remarks on result:
other: No information on pH and temperature stated. Test concentration is 1000 ppm
Key result
Type:
log Pow
Partition coefficient:
-4.1
Remarks on result:
other: No information on pH and temperature stated. Test concentration is 1000 ppm
Details on results:
The measured P values indicate that the Dequest phosphonates are very hydrophilic materials

Table 1: measured octanol/water partition coefficients

Dequest

Concentration in water (ppm)

Measured octanol/water partition coefficient

2041

100

7.9E-05

1000

8.0E-05

log Kow at 100 ppm = -4.1

log Kow at 1000 ppm = -4.1

Conclusions:
Measured Kow values of 7.9E-05 and 8.0E-5 were determined at 100 ppm and 1000 ppm respectively in a reliable study conducted according to generally accepted scientific principles.

Description of key information

log Kow [EDTMP-H]: -4.1

Key value for chemical safety assessment

Log Kow (Log Pow):
-4.1

Additional information

A log Kow value of -4.1 at 100 ppm and 1000 ppm was reported in a reliable study conducted according to generally accepted scientific principles comparable to an appropriate test guideline. Method has been adequately described in the report. The result is considered to be reliable and has been assigned as key study. This is supported by a predicted log Kow value of -4 ±1 using a validated QSAR estimation method. The result from the key study is consistent with a result from available secondary sources, measured at ambient temperature (23°C).

A log Kow value of -4.1 was reported in available secondary sources; full details are not available and the reliability is unassignable. The results are in agreement with the key study.