Registration Dossier

Physical & Chemical properties

Water solubility

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The Solvent Black 46 is a hydrophobic substance, of which the hydrosolubility is protocol-dependent.

Key value for chemical safety assessment

Water solubility:
0.01 mg/L
at the temperature of:
20 °C

Additional information

Solvent Black 46 (SBl 46) is a co-precipitate of Acid Yellow 36 (AY36) and Bacic Violet 3 (BV3) as defined in section 1 of the IUCLID dossier with a ratio of 1:1.

AY 36 represents the anionic part and BV3 represents the cationic part.

The molecule Solvent Black 46 has no specific absorbance and is therefore identified by the respective absorbance of BV3 and AY36.

In normal conditions, there is no dissociation of the molecule SBl 46, thus when both concentrations (BV3 and AY36) are measured as equivalent, it should correspond to the concentration of the entire molecule.

Previous measurements have been performed and have shown that both BV3 and AY 36 could be found as impurities, leading to an excess of one of the starting material, but AY 36 and BV3 cannot coexist in water.

So the observed excess of AY 36 is coming from an excess of AY 36 during the manufacturing process, although the manufacturing process is designed to be under stoichiometric conditions (and also despite the purification steps that should have removed all the soluble components). The presence of BV3 in the extract can be explained by small particles of SBl 46 that have been allowed to go through the filtering membrane (0.20 µm). The dilution step with methanol solubilizes those particles.

It is therefore not possible to distinguish what has been measured: soluble particles of SBl 46 or secondary solubilisation of insoluble particles solubilized by the methanol.

This finding implies that the hydrosolubility of Solvent Black 46 is either not existing or existing but less than 0.01 mg/L.

In the chemical safety report, the value of 0.01 mg/l is used to predict emission concentration (PEC) to the aquatic compartment and to calculate the Log Kow.