4-[[5-(anilino)carbonyl-2-methoxyphenyl]azo]-3-hydroxynaphthalene-2-carboxamide

Partition coefficient

Link to relevant study record(s)

Reference

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

The study was conducted between 13 September 2000 and 7 December 2000.

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:

yes (incl. QA statement)

Type of method:

HPLC method

Partition coefficient type:

octanol-water

Specific details on test material used for the study:

Identity: ST463.
Appearance: magenta powder
Storage conditions: room temperature
Batch number: 6558
Expiry date: August 2001
Purity: 99.4%
Date received: 1 August 2000

Analytical method:

high-performance liquid chromatography

Key result

Type:

log Pow

Partition coefficient:

4.2

Temp.:

30 °C

Remarks on result:

other: pH not reported

The below table presents the primary data from which the calibration curve was generated.

Sample	Component	tr(minutes)	K	Log10k	Log10Pow
Standard Run A (t0= 0.853 minutes)	Etyhlbenzoate	3.509	3.114	0.493	2.6
	Benzophenone	3.816	3.474	0.541	3.2
	Naphthalene	5.548	5.504	0.741	3.6
	Benzylbenzoate	6.354	6.449	0.809	4.0
	Phenanthrene	10.978	11.870	1.074	4.5
	Triphenylamine	25.967	29.967	1.469	4.7
Sample A (t0= 0.860 minutes)	ST463 (test substance)	8.173	8.503	0.930	4.15
Sample B (t0= 0.862 minutes)	ST463 (test substance)	8.246	8.566	0.933	4.16
Standard Run B (t0= 0.860 minutes)	Etyhlbenzoate	3.555	3.134	0.496	2.6
	Benzophenone	3.867	3.497	0.544	3.2
	Naphthalene	5.638	5.556	0.745	3.6
	Benzylbenzoate	6.461	6.513	0.814	4.0
	Phenanthrene	11.167	11.985	1.079	4.5
	Triphenylamine	26.368	29.660	1.472	5.7

The mean calibration curve produced was: log₁₀P_ow = 2.92 log₁₀k + 1.43

where:

k = capacity factor = t'_r / t₀ = t_r - t₀ / t₀

and t'_r = true retention time obtained by substracting deadtime, or t₀ if I.D.S. from measured retention time of sample or reference.

The test samples analysied at 516 nm were re-run at 230 nm to obtain deadtime values as I.D.S was not detectable at the original wavelength.

ST463 was thus determined to have a log₁₀P_ow value of 4.2

Conclusions:

The test substance was found to have a log10Pow value of 4.2.

Executive summary:

The partition coefficient of the substance was determined using the HPLC method. The study was conducted to OECD Method No.117 amd EEC Method A8.

The test substance was found to have a log₁₀P_ow value of 4.2.

Description of key information

The partition coefficient of the substance was determined using the HPLC method. The study was conducted to OECD Method No.117 and EEC Method A8.

The test substance was found to have a log₁₀P_ow value of 4.2.

Key value for chemical safety assessment

Log Kow (Log Pow):

4.2

at the temperature of:

30 °C