Assay (complexometric , Al₂(SO₄)₃): 51.0 - 59.0 % Identity: passes test Appearance of solution: passes test pH-value (2 %; water): 2.5 - 4.0 Chloride (Cl): ≤ 0.005 % Heavy metals (as Pb): ≤ 0.002 % As (Arsenic): ≤ 0.0003 % Fe (Iron): ≤ 0.005 % V (Vanadium)*: ≤ 0.0001 NH₄ (Ammonium): ≤ 0.01 % Alkali- and alkaline earth metals: ≤ 0.4 % Residual solvents (ICH Q3C): excluded by production process Elemental impurity specifications have been set considering ICH Q3D (Guideline for Elemental Impurities). Class 1-3 elements are not likely to be present above the ICH Q3D option 1 limit, unless specified and indicated (*). Corresponds to Ph Eur, BP
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