Strontium 4-[(4-chloro-5-methyl-2-sulphonatophenyl)azo]-3-hydroxy-2-naphthoate (1:1)

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Version / remarks:

and ETAD method

Principles of method if other than guideline:

To measure the partition coefficient of pigments utilising the standard OECD Guideline 107 is extremely difficult because of the problems associated with the inherent very low solubilities. The following procedure is used for determining the LogPow of low solubility substances and in particular that of pigments.
The partition coefficient was estimated based on the ratio of the solubilities in n-octanol and in water. The individual solubilities were determined by flask method based on OECD Guideline 105 and the ETAD method.

GLP compliance:

no

Type of method:

flask method

Specific details on test material used for the study:

- Name of test material (as cited in study report): Pigment Rot 52:Sr
- Physical state: powder
- Lot/batch No.: JW111201

Key result

Water solubility:

< 15 µg/L

Conc. based on:

test mat. (total fraction)

Incubation duration:

72 h

Temp.:

23 °C

Remarks on result:

other: mean value of 3 tests

Conclusions:

The water solubility of test substance was determined to be <15 µg/L at 23°C

Description of key information

<15 µg/L at 23 °C

Additional information

The solubility was determined by flask method based on OECD Guideline 105 and the ETAD method. The quantification was analyzed by UV/Vis absorption.

The non-resin-coated test substance is representative pure substance therefore its data has been chosen as the key study.