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Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
29-04-2017 - 29-04-2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental test result performed using standard test guidelines
Qualifier:
according to
Guideline:
OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
GLP compliance:
no
Type of method:
HPLC method
Partition coefficient type:
octanol-water
Specific details on test material used for the study:
Test Item Name : 4-(phenylazo)benzene-1,3-diamine
CAS No. : 495-54-5
Batch No./ Lot no. : KCP/FS/43/17
Physical Appearance : orange powder
Date of manufacturing : 08-01-17
Date of expiry : 08-12-17
Purity : not available in coa
Stability : Stable in recommended storage conditions
Storage Conditions : 1. Ambient Temp (23 to 27 °C)
Precautions : Wear respiratory protection. Avoid contact with skin and eyes. Avoid dust formation. Avoid breathing dust, fume, vapours, mist, spray or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Use only in a chemical fume hood.
Molecular formula : C12-H12-N4
Molecular weight : 212.255
Analytical method:
high-performance liquid chromatography
Key result
Type:
log Pow
Partition coefficient:
2.715
Temp.:
25 °C
pH:
7.32

Test substance

 

K

Log k

Log Pow by Generalized Calibration

Graph

Mean of Log Pow ± S.D.

tR1

1.857

0.9748

-0.0111

2.7168

2.7148±0.003

tR2

1.854

0.9716

-0.0125

2.7127

Conclusions:
The partition coefficient(n-octanol/water) of test substance 4-(phenylazo)benzene-1,3-diamine (CAS No. 495-54-5)was determined as per the HPLC method
(OECD Guideline-117). The Log Pow value was found to be 2.7148 ± 0.003 at 25°C
Executive summary:

The partition Coefficient n-octanol/water of 4-(phenylazo)benzene-1,3-diamine(CAS No.495-54-5) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 117 for testing of Chemicals.The reference substances were chosen according to functional similarity with the test substance and calibration graph was prepared. The reference substances were Benzene, Biphenyl, 4 -Acetylpyridine, Toluene, Ethylbenzene, n-Butylbenzene, Naphthalene having Pow value ranging from 0.5 to 4.6 The Log Pow value was found to be 2.7148 ± 0.003 at 25°C.

Description of key information

The partition coefficient(n-octanol/water) of test substance 4-(phenylazo)benzene-1,3-diamine (CAS No. 495-54-5)was determined as per the HPLC method

(OECD Guideline-117). The Log Pow value was found to be 2.7148 ± 0.003 at 25°C

Key value for chemical safety assessment

Log Kow (Log Pow):
2.715
at the temperature of:
25 °C

Additional information

The partition Coefficient n-octanol/water of 4-(phenylazo)benzene-1,3-diamine(CAS No.495-54-5) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 117 for testing of Chemicals.The reference substances were chosen according to functional similarity with the test substance and calibration graph was prepared. The reference substances were Benzene, Biphenyl, 4 -Acetylpyridine, Toluene, Ethylbenzene, n-Butylbenzene, Naphthalene having Pow value ranging from 0.5 to 4.6 The Log Pow value was found to be 2.7148 ± 0.003 at 25°C.

Supporting data from reliable handbook source and database the octanol-water partition coefficient (Log Kow) of 4-(Phenylazo)benzene-1,3-diamine is determined to be 2.13 indicating that the substance is hydrophillic in nature.( Handbook of Physical Properties of Organic Chemicals and SRC phys prop database).

Both these values indicates that the substance 4-(phenylazo)benzene-1,3-diamine is hydrophillic in nature which in turn is supported by its water solubility.