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The results of the transformation/dissolution tests in aqueous media (IUCLID 5.6.) and of the aquatic toxicity tests documented in this section 6 all consistently demonstrate the very limited solubility of slag, lead-zinc smelting. For this reason, the testing for soil toxicity is waived, because exposure to zinc ions in the pore water is anticipated to be very limited. Slag, lead-zinc smelting is very stable also in soils. The results on soil toxicity obtained with soluble or slightly soluble zinc compounds are not considered relevant for slag, lead-zinc smelting.