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EC number: 255-037-7 | CAS number: 40690-89-9
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:
- November 16, 2016 - November 17, 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.8 (Partition Coefficient - HPLC Method)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- HPLC method
- Partition coefficient type:
- octanol-water
- Analytical method:
- high-performance liquid chromatography
- Key result
- Type:
- log Pow
- Partition coefficient:
- 4.8
- Temp.:
- 25 °C
- Remarks on result:
- other: pH not determined
- Executive summary:
The partition coefficient n-octanol/water of the test item Disperse Orange 73 was determined according to the HPLC method.
It was found to be: log POW = 4.8
Reference
Calculation of the partition coefficient log POW
The program KOWWIN (part of EPI Suite) was used for calculating the log POW of the test item. The calculated value was 5.68.
Therefore according to the guidelines the partition coefficient n-octanol/water of the test item at room temperature was determined by the HPLC method.
HPLC method
The results from the HPLC method are summarized in Table2 to Table7.
Table2: Determination of the dead time t0
Dead time marker |
tR / min 1stinjection |
tR / min 2stinjection |
tR / min |
Formamide |
1.04 |
1.04 |
1.04 |
Dead time: t0 = 1.04 min
Table3: Calibration data 1st injection
Calibration substance |
tR / min |
k |
log k |
log POW 1) |
2-Butanone |
1.238 |
0.19 |
-0.73 |
0.3 |
Acetanilide |
1.311 |
0.26 |
-0.59 |
1.0 |
Cinnamyl alcohol |
1.575 |
0.51 |
-0.29 |
1.9 |
2,6-Dichlorobenzonitrile |
2.011 |
0.93 |
-0.03 |
2.6 |
Allyl phenyl ether |
2.918 |
1.80 |
0.25 |
2.9 |
Benzophenone |
2.607 |
1.50 |
0.18 |
3.2 |
Cumene |
5.433 |
4.20 |
0.62 |
3.7 |
Diphenyl ether |
4.971 |
3.76 |
0.58 |
4.2 |
Fluoranthene |
10.239 |
8.81 |
0.94 |
5.1 |
4,4’-DDT |
25.842 |
23.75 |
1.38 |
6.5 |
1)OECD guideline 117, adopted 2004
Regression:
Parameters: a = 2.509
b = 2.747
r2= 0.9809
Table4: log POWof the test item – 1st injection
Test item |
tR/ min |
k |
log k |
log POW |
Disperse Orange 73 |
7.905 |
6.57 |
0.82 |
4.75 |
Table5: Calibration data 2nd injection
Calibration substance |
tR / min |
k |
log k |
log POW 1) |
2-Butanone |
1.239 |
0.19 |
-0.73 |
0.3 |
Acetanilide |
1.312 |
0.26 |
-0.59 |
1.0 |
Cinnamyl alcohol |
1.577 |
0.51 |
-0.29 |
1.9 |
2,6-Dichlorobenzonitrile |
2.011 |
0.93 |
-0.03 |
2.6 |
Allyl phenyl ether |
2.919 |
1.80 |
0.25 |
2.9 |
Benzophenone |
2.604 |
1.49 |
0.17 |
3.2 |
Cumene |
5.429 |
4.20 |
0.62 |
3.7 |
Diphenyl ether |
4.964 |
3.75 |
0.57 |
4.2 |
Fluoranthene |
10.219 |
8.79 |
0.94 |
5.1 |
4,4’-DDT |
25.746 |
23.66 |
1.37 |
6.5 |
1)OECD guideline 117, adopted 2004
Regression:
Parameters: a = 2.507
b = 2.751
r2= 0.9808
Table6: log POWof the test item – 2nd injection
Test item |
tR/ min |
k |
log k |
log POW |
Disperse Orange 73 |
7.890 |
6.56 |
0.82 |
4.75 |
The results of the 1st and 2nd determination are summarized inTable7.
Table7: log POWof the test item – summary
Test item |
log POW |
||
1stinjection |
2ndinjection |
Mean value |
|
Disperse Orange 73 |
4.75 |
4.75 |
4.8 |
The partition coefficient POWof the test item was determined to be:
log POW = 4.8
Description of key information
The partition coefficient n-octanol/water of the test itemDisperse Orange 73 was determined according to the HPLC method.
It was found to be:
log POW= 4.8
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 4.8
- at the temperature of:
- 25 °C
Additional information
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