Registration Dossier
Registration Dossier
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EC number: 273-732-3 | CAS number: 69012-32-4 By-product of smelting of phosphate rock, silica and coke in manufacture of phosphorus.
Endpoint summary
Administrative data
Description of key information
Additional information
The poor water solubility of the test substance is causing problems in the performance of many studies. Thus its is proposed to waive the the studies on hydrolysis and adsorption/desortpion due the fact that it is impossible to prepare an adequate solution in water since the tests are technically not feasible.
Also a study on the bioaccumulation in aquatic species is not conducted. A bioconcentration study on fish is technically not feasible as the substance is poorly soluble in water. As shown in the study acc. to the dissolution/transformation protocol most of the elements remain below the detection level. Only F and Si are detectable.
In a dietary study the test substance being a solid, should be ingested by the test organism. Due to the low dissolution of the elements from the particles the bioavailability of the test substance will remain very low. Moreover, only F and Si were detectable and they are not relevant in view of their bioaccumulation potential. Thus a the bioaccumulation study is not expected to yield any useful results and is therefore not proposed.
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