Registration Dossier
Registration Dossier
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EC number: 238-485-8 | CAS number: 14484-69-6
Endpoint summary
Administrative data
Description of key information
Additional information
Due to the fact that potassium tetrafluoroaluminate is an inorganic substance, only abiotic degradation can be considered. As no information is available on abiotic degradation of potassium tetrafluoroaluminate, data from its structural analogue cryolite (Na3AlF6) is taken into account. In a dissociation and acid/base equilibrium study cryolite was observed to easily dissociate in water into various ions (Dykeman, 1985). Based on the structural analogy it can be expected that also potassium tetrafluoroaluminate will easily dissociate into various ions in water.
As cryolite dissociates in water and the risks are assumed to be determined by fluoride, it is more appropriate to assess the bioaccumulation and adsorption behaviour of fluoride. The availability of inorganic substances and or its dissociated ions for uptake may vary depending on factors such as pH, hardness, temperature and redox conditions, all of which may affect speciation. BCF values will therefore be influenced by water chemistry. A BCF value of 2 L/kg ww as determined for fluoride will be used in the assessment. In a column leaching test, Koc values varying from 603 - 6502 were found for fluoride in 4 different soils, tested at cryolite concentrations varying from 5 - 50 ppm (Dykeman, 1985). As the percentage of fluoride in the molar weight in both substances is practically identical, namely 54% for cryolite and 53.5% for potassium tetrafluoroaluminate, similar Koc values can be expected for potassium tetrafluoroaluminate and it is considered that potassium tetrafluoroaluminate will show a similar behaviour in soil. The geometric mean of 1498 (log Koc 3.18) will be used in the assessment.
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