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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties

Partition coefficient

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Description of key information

log Kow < -1.1 

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
23 °C

Additional information

The test substance is an aqueous solution in 40 % acetic acid. Basic Yellow 28 Acetate is only stable in presence of significant concentrations of free acetic acid; it can not be isolated as such. Therefore, the exact water or n-octanol solubility of Basic Yellow 28 Acetate cannot be determined.

The water solubility of Basic Yellow 28 as methyl sulfate at 20 °C was determined to be 8.8 g/L.

The partition coefficient n-octanol/water of Basic Yellow 28 as methyl sulfate was determined to be log KOW = -1.1

Basic Yellow 28 with the acetate counter-anion has a considerably higher solubility in acetic acid solution. The common marketed product contains 40 % of Basic Yellow 28 Acetate, hence the solubility is higher than 400 g/L. It should therefore have a distinctly lower log Kow than the methyl sulfate salt.