Registration Dossier

Administrative data

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
OECD 105

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2018

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Type of method:
flask method

Test material

Constituent 1
Chemical structure
Reference substance name:
Disodium 4-amino-3-[[4-[(2-amino-4-hydroxyphenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate
EC Number:
270-629-5
EC Name:
Disodium 4-amino-3-[[4-[(2-amino-4-hydroxyphenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate
Cas Number:
68460-07-1
Molecular formula:
C28H22N8O8S2.2Na
IUPAC Name:
disodium 4-amino-3-({4-[(2-amino-4-hydroxyphenyl)diazenyl]phenyl}diazenyl)-5-hydroxy-6-(phenyldiazenyl)naphthalene-2,7-disulfonate
Constituent 2
Chemical structure
Reference substance name:
Disodium 4-amino-3-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate
EC Number:
272-559-0
EC Name:
Disodium 4-amino-3-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate
Cas Number:
68877-33-8
Molecular formula:
C28H23N9O7S2.2Na
IUPAC Name:
disodium 4-amino-3-({4-[(2,4-diaminophenyl)diazenyl]phenyl}diazenyl)-5-hydroxy-6-(phenyldiazenyl)naphthalene-2,7-disulfonate

Results and discussion

Water solubility
Key result
Water solubility:
ca. 25 - <= 32 g/L
Conc. based on:
test mat.
Temp.:
20 °C
pH:
ca. 6.2

Any other information on results incl. tables

Table 1: results of preliminary test

due to the intensive dark colour of the solutions visual evaluation was restricted. Therefore, a filter test was carried out to determine the approx. solubilty of the test substance:

the solutions cannot be filtered through a 0.2 µm RC syringe filter: not soluble

the solutions can be filtered through a 0.2 µm RC syringe filter: soluble

water for 0.1 g test item [mL]

0.1

0.5

1

2

10

100

150

approximate solubility [g/L]

> 1000

200 -1000

100 - 200

50 - 100

10 - 50

1 – 10

< 1

(visual) evaluation

not soluble

not

soluble

not

soluble

not

soluble

soluble

soluble

soluble

Table 2: results of flask method

Flask

concentration theor.

concentration found

Recovery

1

24.8 g/L

22.3 g/L

90 %

2

31.9 g/L

28.1 g/L

88 %

Applicant's summary and conclusion