Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

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). The geometric mean of 1,498 (log Koc 3.18) will be used in the assessment.