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Environmental fate & pathways


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The data requirements with regard to hydrolysis can be considered to be fulfilled. According to the guidance, this endpoint is specifically needed for organic substances and less relevant for inorganic substances. When mixing lime (chemical) hydraulic with water, a proportion (1010 mg calcium/L; see IUCLID section 4.8) dissolves and dissociates, forming calcium ions (Ca2+) and hydroxyl ions (OH-). The release of hydroxyl ions causes a net pH increase. The rest of the substance remains in suspension. It can be reasonably assumed that in the aquatic environment the substance will be completely dissociated into its ions as the water solubility is relatively high compared to the environmental background concentration of calcium (i.e. 0.2-600 mg/L; median 40.2 mg/L; according to FOREGS Geochemical Baseline Mapping Programme) and due to dilution effects. Furthermore, the OH- ions will react with HCO3- to form water and carbonate ions which react with Ca2+ to form calcium carbonate. Calcium carbonate precipitates and deposits on the sediment. Calcium carbonate is a constituents of natural soils. As such, depending on the properties of the test medium, lime (chemical) hydraulic will be strongly neutralised in the initial period after application.

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