Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
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tetrakis[({bis[4-(dimethylamino)phenyl] and 4-(methylamino)phenyl} or {4-(dimethylamino)phenyl and bis[4-(methylamino)phenyl]} or {tris[4-(dimethylamino)phenyl]}methylium)]C12-(branched and/or linear)-alkyl-(4-sulfonatophenoxy)benzenesulfonate and oxybis[C12-(branched and/or linear)-alkyl-benzenesulfonate].
EC number: 700-759-4 | 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:
- 10 mg/L
- at the temperature of:
- 22 °C
Additional information
- The measured BV1+ concentration is 0.07-0.18 mg/L.
- The measured Dowfax 2A1- concentration is 6.4-14.9 mg/L
- The Violet 88 -1239 concentration is calculated from the ion which is not in excess (so BV1 +) and is 0.12-0.31 mg/L (using a mass ration extrapolation).
Violet 88-1239 is a co-precipitate of Basic Violet 1 (BV1) and DowFax 2A1 as defined in section 1 of the IUCLID dossier with a ratio of 2 moles of BV1 for 1 mole of Dowfax 2A1.
The molecule Violet 88-1239 has no specific absorbance and is therefore identified by the absorbance of both the BV1+ and the Dowfax 2A1 -. In normal conditions, there is no dissociation of the molecule Violet 88-1239, thus when both concentrations (BV1 and Dowfax) are measured as equivalent, it corresponds to the concentrations of the Violet 88 -1239.
Several aqueous extractions have been prepared and analyzed thanks to photometry and then an HPLC has been performed to detect the different fractions (isomers, BV1+, Dowfax).
3 different assays have been performed and the following conclusions have been reached:
Although the manufacturing process is designed to be under stoichiometric conditions, the Dowfax in excess is coming from an excess of Dowfax during the manufacturing. Assays on other dyes have shown that the excess of the starting material could be on either the cation or the anion. Therefore an excess of BV1+ cannot be excluded with another batch. This excess would be in the same range of values (1 to 15 mg/L max). A water solubility value of 10 mg/L is chosen as a median value since it encompasses the excess of ions that are part of the molecule. The solubility of the molecule Violet 8812-39 itself is 0,12-0,31 mg/L. However this value is likely to be overestimated as the use of methanol for the matrix may have solubilized some particles that escaped the filtering process.
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