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EC number: 701-200-7
CAS number: -
The molecules of the multiconstituent substance ionise under aqueous
conditions in the environment to form potassium, aluminium and fluoride
ions which will combine to form various inorganic salts and organic
The concept of biodegradation does not apply to inorganic substances.
Due to the dissociation behaviour of this multiconstituent substance,
its bioaccumulation cannot be assessed. Given its ionic nature, the
substance is expected to partition favourably to water rather than
organic and fatty media.
As no information is available on adsorption/desorption of reaction mass
of potassium aluminium tetrafluoride and tripotassium
hexafluoroaluminate, data from its structural analogue cryolite is taken
into account. As cryolite dissociates in water and the risks are assumed
to be determined by fluoride, it is more appropriate to assess the
adsorption behaviour of fluoride. 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 approx.
53% for aluminium potassium fluoride, similar Koc values can be expected
for multiconstituent aluminium potassium fluoride and it is considered
that aluminium potassium fluoride 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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