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Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
Version / remarks:
1995
GLP compliance:
no
Type of method:
flask method
Partition coefficient type:
octanol-water
Analytical method:
photometric method
Type:
Pow
Partition coefficient:
8.579
Temp.:
20 °C
Remarks on result:
other: pH n.a.
Type:
log Pow
Partition coefficient:
0.929
Temp.:
20 °C
Remarks on result:
other: pH n.a.

At 96 hours values reached equilibrium, and so this value was considered for final calculations making duplicate determinations of every ratio o/w. Concentration of mother solution: W1 = 0.0406 g / 100ml = 0.4060 g/l.

ratio o/w water phase c(g/l) n-octanol phase c(g/l) Pow log Pow average log Pow
70/30 0.0325 0.3302 10.1615 1.006960 10.015
70/30 0.0332 0.3286 9.9108 0.996109
50/50 0.0427 0.3633 8.5091 0.929883 0.9328
50/50 0.0422 0.3638 8.6258 0.935798
30/70 0.0549 0.3825 6.9608 0.842656 0.8530
30/70 0.0525 0.3835 7.3005 0.863352
pH of test solution n.a.
average Pow 8.5788 average log Pow 0.929
std. dev. Pow 1.4528 std. dev. log Pow 0.074
Conclusions:
log Pow = 0.929 at 20 °C.
Executive summary:

Method

Partition coefficient determined by shake flask method according to OECD guideline 107.

Results

log Pow = 0.929 at 20 °C; pH value, not available.

Description of key information

0.929

Key value for chemical safety assessment

Log Kow (Log Pow):
0.929
at the temperature of:
25 °C

Additional information