Registration Dossier
Registration Dossier
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EC number: 700-615-0 | CAS number: -
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Determination and significance of the water solubility value.
Key value for chemical safety assessment
- Water solubility:
- 0.01 mg/L
- at the temperature of:
- 22 °C
Additional information
To simplify the description, Sepisol fast Violet 3B was represented as a co-precipitate of Direct Blue 87 [DB87] (CAS 1330-39-8; EC: 215-538-3) and Basic Violet 3 [BV 3] (CAS 548 -62 -9 and CE: 208-953 -6) as defined in section 1 of the IUCLID dossier with an average ratio of 2.843 moles of BV3 for 1 mole of DB87.
DB87 represents the anionic part and BV3 represents the cationic part.
The molecule Sepisol Fast Violet 3B has no specific absorbance and is therefore identified by the absorbance of both BV3+ and DB87 -. In normal conditions, there is no dissociation of the molecule Sepisol Fast Violet 3B, thus when both concentrations (V3B and DB87) 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 DB87 could be found as impurities. Therefore an excess of DB87 cannot be excluded with another batch. This DB87 excess would generally be in the range: 0 - 1.2 mg/L maximum and most generally: 0.3 mg/L. For BV3, historical values lie from 0 up to 18 mg/L. Most generally: 0 - 3 mg/L. An average value for the BV3 concentraiton is 2 mg/L.
This finding implies that the hydrosolubility of Sepisol Fast Violet 3B is either not existing or existing but less than 0.01 mg/L. No dissociation of the molecule in water is expected. Although the manufacturing process is designed to be under stoichiometric conditions, the BV3+ excess is coming from an excess of BV3 during the manufacturing process (and also despite the purification steps that should have removed all the soluble components).
Even though it has been shown that the solubility of Sepisol Fast Violet 3B is less than 0.01 mg/L or not existing, an average value for the Sepisol fast Violet 3B hydrosolubility of 2 mg/L has been used for the ecotoxicity and biodegradation assay, which corresponds to the excess of the cation.
Therefore, in the chemical safety report, the value of 0.01 mg/l is used to predict emission concentration (PEC) to the quatic compartment.
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