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Environmental fate & pathways

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The substance is a multi-constituent substance and no data on the environmental fate and pathways is available for the substance itself. Data is presented for one of the major constituents, hematite (Fe2O3), and for the lead impurity. Data for the environmental fate and pathways section could mostly be waived because the major constituents of the substance are both inorganic and insoluble in water. Exception is the section on adsorption/desorption where information concerning Kd values was gathered for one of the major constituents: Diiron trioxide.

For the impurity LEAD: In assessing the ecotoxicity of metals in the various environmental compartments (aquatic, terrestrial and sediment), it is assumed that toxicity is not controlled by the total concentration of a metal, but by the bioavailable form. For metals, this bioavailable form is generally accepted to be the free metal-ion in solution. In the absence of speciation data and as a conservative approximation, it can also be assumed that the total soluble lead pool is bioavailable. All reliable data on ecotoxicity and environmental fate and behaviour of lead and lead substances were therefore selected based on soluble Pb salts or measured (dissolved) Pb concentration. 

The reliable data selected for the environmental fate and behaviour of lead are all based on either monitoring data of prevailing lead concentrations in water, soil, sediment, suspended matter and organisms or on experimental results with lead (di)nitrate and lead chloride. All reliable data are expressed based on elemental Pb concentrations and grouped together in a read-across approach and will be used for all lead substances because upon dissolution of lead substances, the Pb-ion is the controlling adsorption and bioaccumulation species.

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