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Environmental fate & pathways

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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 aluminium potassium fluoride and it is considered that aluminium potassium fluoride will show a similar behaviour in soil.