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Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
13-02-2018 – 19-02-2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental test result performed using standard OECD test guidelines.
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Principles of method if other than guideline:
The water solubility determination of test item N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2-amine (CAS No. 93964-07-9) was done as per the OECD guideline 105 by spectrophotometric analytical method as per OECD 101.
GLP compliance:
not specified
Type of method:
other: By spectrophotometric analytical method
Specific details on test material used for the study:
- Name of the test material: N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2-amine
- Regulatory name: N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2-amine
- Molecular formula: C32H37N5
- Molecular weight: 491.6793 g/mol
- Smiles: CCCCC(CC)CNc1ccc2ccccc2c1/N=N/c3ccc(cc3C)/N=N/c4ccc(cc4)C
- InChI: 1S/C32H37N5/c1-5-7-10-25(6-2)22-33-31-19-15-26-11-8-9-12-29(26)32(31)37-36-30-20-18-28(21-24(30)4)35-34-27-16-13-23(3)14-17-27/h8-9,11-21,25,33H,5-7,10,22H2,1-4H3/b35-34+,37-36+
- Substance type: Organic
Physical form: Dark red clear liquid
Key result
Water solubility:
0.019 mg/L
Conc. based on:
test mat.
Temp.:
25 °C
Remarks on result:
other: Insoluble in water

WATER SOLUBILITY: PRELIMINARY TEST

0.1g of test item was taken in 100 ml beaker. DI water was added in increasing amount in sequence of 0.1 ml, 0.5 ml, 1.0 ml,

2.0 ml, 10.0 ml and 100.0 ml with intermediate stirring.

For poorly soluble substances: Preliminary water solubility of test item was found 0.1g in > 100 ml DI water. For analytical determination 100 mg of test item was dissolved in 100 ml of DI water. The solution was kept for 96 hrs on stirring and absorbance was recorded. Concentration detected on the basis of standard curve was 0.2879 mg/L. Five times the concentration recoded from preliminary solubility was used for confirmatory study.

WATER SOLUBILITY: CONFIRMATORY TEST

Five times the concentration recorded from preliminary solubility = 0.2879 mg/L × 5 = 1.4395 mg/L was used for confirmatory

study. Two separate solution of 1.4395 mg in 1000 ml DI water were prepared and kept for stirring for 48 hrs and 72 hrs. After

the completion of stirring period the absorbance for all the two solution were recorded and concentration was detected on the

basis of standard curve. Table 2 refers to the same.

Sample stirring

Concentration obtained on

Dilution factor

Solubility value obtained

 

the basis of standard curve

 

(mg/L)

24 hour

-

-

-

48 hour

0.0155

-

0.0155

72 hour

0.0228

-

0.0228

 

Considering the water solubility for 48 hrs and 72 hrs the mean water solubility was calculated as follows:

  Mean water solubility value for 48 hour run sample + 72 hour run sample

 =(0.0155+0.0228)/2

  =0.0191 mg/L


Conclusions:
The water solubility for the test item N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2-amine was found to be 0.0191 mg/L at 25°C.
Executive summary:

The water solubility determination of test item N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2- amine (CAS No. 93964-07-9) was done as per the OECD guideline 105 by spectrophotometric analytical method as per OECD 101. The solubility of (N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2-amine of CAS No: 93964-07-9 )in water was found to be 0.0191 mg/L at 25°C.

Description of key information

The water solubility for the test item N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2-amine was found to be 0.0191 mg/L at 25°C.

Key value for chemical safety assessment

Water solubility:
0.019 mg/L
at the temperature of:
25 °C

Additional information

The water solubility determination of test item N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2- amine (CAS No. 93964-07-9) was done as per the OECD guideline 105 by spectrophotometric analytical method as per OECD 101. The solubility of (N-(2-ethylhexyl)-1-[[2-methyl-4-[(4-methylphenyl)azo]phenyl]azo]naphthalen-2-amine of CAS No: 93964-07-9 )in water was found to be 0.0191 mg/L at 25°C.