A dried sludge product resulting from the treatment process of domestic wastewater. The exact processes followed for the production of the dried sludge are: Preliminary + secondary treatment of the wastewater stream, thickening, dehydration and drying of the excess sludge.

Partition coefficient

Link to relevant study record(s)

Reference

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

16 March 2021 – 24 March 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.8 (Partition Coefficient - Shake Flask Method)

Deviations:

no

Remarks:

Although the method described applies only to essentially pure substances soluble in water and n-octanol, it was used to obtain an average partition coefficient of this material which contains a number of different organic & inorganic compounds.

Type of method:

flask method

Partition coefficient type:

octanol-water

Analytical method:

photometric method

Key result

Type:

log Pow

Partition coefficient:

ca. -0.52

Temp.:

20 °C

pH:

ca. 6.98

Details on results:

The Partition Coefficient, log10P of the soluble parts of the sample in octanol and distilled water at 20±2oC was found to be -0.52 ± 0.12. The partition coefficient of the whole sample should be considered indeterminate.

Conclusions:

The Partition Coefficient, log10P of the sample in octanol and distilled water at 20 ± 2 oC was examined by the shake flask method using UV absorption. However, the sample is a mixture of compounds only few of which are soluble, therefore the partition coefficient of the whole sample should be considered indeterminate. Taking into account the soluble parts, the partition coefficient of the substance found to be -0.52 ± 0.12.

Executive summary:

The Partition Coefficient, log₁₀P of the sample in octanol and distilled water at 20 ± 2 ^oC was examined by the shake flask method using UV absorption. However, the sample is a mixture of compounds only few of which are soluble, therefore the partition coefficient of the whole sample should be considered indeterminate. Taking into account the soluble parts, the partition coefficient of the substance found to be -0.52 ± 0.12.  

Description of key information

EU Method A.8 (Partition Coefficient - Shake Flask Method)  

 

Additional information

The sample is a mixture of compounds only few of which are soluble. Hence, the partition coefficient of the whole sample should be considered indeterminate.

However, the test was performed to evaluate the solubility of the soluble parts and was found to be -0.52 ± 0.12.