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EC number: 701-024-0 | CAS number: 26038-87-9
Partition coefficient
Administrative data
Link to relevant study record(s)
- Endpoint:
- partition coefficient
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 06 September 2017 to 10 November 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.8 (Partition Coefficient - Shake Flask Method)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7550 (Partition Coefficient, n-octanol / H2O, Shake Flask Method)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- flask method
- Partition coefficient type:
- octanol-water
- Analytical method:
- liquid chromatography
- other: ICP-MS
- Type:
- log Pow
- Partition coefficient:
- -0.9
- Temp.:
- 19.7 °C
- pH:
- >= 8.3 - <= 8.6
- Remarks on result:
- other: Partition coefficient of polyborate moiety.
- Remarks:
- The pH measured for the samples is in the environmental range (5-9) and therefore this was considered to have no impact in the study and the results.
- Type:
- log Pow
- Partition coefficient:
- -2.5
- Temp.:
- 19.7 °C
- pH:
- >= 8.3 - <= 8.6
- Remarks on result:
- other: Partition coefficient for organic moiety.
- Remarks:
- The pH measured for the samples is in the environmental range (5-9) and therefore this was considered to have no impact in the study and the results.
- Details on results:
- The log Pow values were within the acceptable range of ± 0.3 log units.
- Conclusions:
- The partition coefficient (log Pow) of Reaction products of monoethanolamine and boric acid (1:3) in an OECD 107 study conducted under GLP conditions was the following:
- at 19.7°C, pH 7, for the polyborate moiety: -0.9.
- at 19.7°C, pH 7, for the organic moiety: -2.5.
The determined log Pow values were within the acceptable range of ± 0.3 log units. - Executive summary:
The n-octanol/water partition coefficient of the test item was determined according to OECD guideline 107 and EC method A.8. The analytical methods were validated following SANCO/3029/99 rev. 4. The determined partition coefficient (log Pow) at 19.7°C, pH 8.3 -8.6, for the polyborate moiety is -0.9. The determined partition coefficient (log Pow) at 19.7°C, pH 8.3-8.6, for the organic moiety is -2.5.
Reference
Partition coefficient for polyborate moiety:
Ratio |
Analyzed concentration |
Pow |
log Pow |
pH |
||
n-octanol |
water |
individual |
mean |
|||
1:1 |
0.441 |
3.25 |
1.4 x 10-1 |
1.4 x 10-1 |
-0.9 |
8.5 |
|
0.441 |
3.13 |
1.4 x 10-1 |
|
-0.9 |
8.5 |
1:2 |
0.381 |
2.72 |
1.4 x 10-1 |
1.4 x 10-1 |
-0.9 |
8.3 |
|
0.381 |
2.60 |
1.5 x 10-1 |
|
-0.8 |
8.3 |
2:1 |
0.541 |
4.41 |
1.2 x 10-1 |
1.3 x 10-1 |
-0.9 |
8.6 |
|
0.531 |
4.14 |
1.3 x 10-1 |
|
-0.9 |
8.6 |
Mean |
1.4 x 10-1 |
|
-0.9 |
|
||
Standard deviation |
8.9 x 10-3 |
|
|
|
||
|
Partition coefficient for organic moiety:
Ratio |
Analyzed concentration |
Pow |
log Pow |
pH |
||
n-octanol |
water |
individual |
mean |
|||
1:1 |
0.00905 |
2.95 |
3.1 x 10-3 |
3.1 x 10-3 |
-2.5 |
8.5 |
|
0.00942 |
2.93 |
3.2 x 10-3 |
|
-2.5 |
8.5 |
1:2 |
0.00529 |
2.26 |
2.3 x 10-3 |
2.3 x 10-3 |
-2.6 |
8.3 |
|
0.00493 |
2.18 |
2.3 x 10-3 |
|
-2.6 |
8.3 |
2:1 |
0.0189 |
4.26 |
4.4 x 10-3 |
4.4 x 10-3 |
-2.4 |
8.6 |
|
0.0185 |
4.30 |
4.3 x 10-3 |
|
-2.4 |
8.6 |
Mean |
3.3 x 10-3 |
|
-2.5 |
|
||
Standard deviation |
9.3 x 10-4 |
|
|
|
||
|
Description of key information
The partition coefficient (log Pow) of Reaction products of monoethanolamine and boric acid (1:3) in an OECD 107 study conducted under GLP conditions was the following:
- at 19.7°C, pH 7, for the polyborate moiety: -0.9.
- at 19.7°C, pH 7, for the organic moiety: -2.5.
Key value for chemical safety assessment
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