Castor oil, sulfated, ammonium salt

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Water solubility:

> 12.3 - < 31.4 mg/L

Conc. based on:

test mat. (dissolved fraction)

Loading of aqueous phase:

70 mg/L

Incubation duration:

ca. 21 h

Temp.:

20 °C

pH:

> 6.3 - < 7.2

Details on results:

The test item formed a cloudy, translucent or opaque mixture in water depending on the loading rate. It was not possible to produce a true solution with filtration through a 0.1 μm filter; the resultant filtrates presented Tyndall beam effects in all but the lowest loading rate mixtures. It was considered that analysis by total organic carbon was the most appropriate technique for the mixtures.
The limit of quantification for the TOC analysis is considered to be 1 mg/L. The TOC results for the blank solutions in the preliminary test and repeated main test were less than 1 mg/L. Since the blank values were less than the LOQ, the sample solution concentrations have not been corrected for the blank values. However, in the first analysis of the main test , the blank solutions were found to be higher and more variable. Since the duplicate sample solutions were inconsistent (2.2 and 0.9 mg/L), this was
considered to be most likely due to contamination of the blank solution during transfer to the analysis vessel. Therefore, it was not considered appropriate to correct the sample solution concentrations for the mean of the blank solution value.
The concentrations of the 24, 48 and 72 hour samples were within ± 15% and thus there was no observed effect of incubation/shaking time.
filtration, and so the mixture was not fully homogeneous at this loading rate.
The TOC results indicated a loading rate dependency for the water solubility endpoint

Conclusions:

The substance was tested for water solubility following OECD 105. Under the experimental conditions the water solubility was > 12.3 and < 31.4 mg/l (TOC measured) at 20°C.

Executive summary:

The substance was tested for water solubility following OECD 105. The solutions were first prepared as flask method, stirred, filtered and analyused byt Tyndall beam technique. For those solutiosn were no Tyndal effect was observed the TOC determination was performed. Under the experimental conditions the water solubility was > 12.3 and < 31.4 mg/l (TOC measured) at 20°C.

Description of key information

< 31.4 mg/l at 20°C

Key value for chemical safety assessment

Water solubility:

31 mg/L

at the temperature of:

20 °C

Additional information

Based on the experimental result the substance can be regarded as slightly soluble (0.1-100 mg/L). Water solubility was less than 31.4 mg/L using a visual assessment method, Tyndall beam technique.