| Assay (alkalimetric) | 
99.8 – 100.5 % | 
| Identity | 
passes test | 
| Appearance of the substance | 
passes test | 
| Solidification temperature | 
≥ 15.6 °C | 
| Foreign organic substances | 
passes test | 
| Formic acid, Formates and other oxidable impurities (as HCOOH) | 
≤ 0.10 % | 
| Heavy metals (as Pb) | 
≤ 0.0005 % | 
| Chloride (Cl) | 
≤ 0.0002 % | 
| Sulphate (SO₄) | 
≤ 0.0005 % | 
| Al (Aluminium) | 
≤ 0.00005 % | 
| As (Arsenic) | 
≤ 0.00010 % | 
| Cu (Copper) | 
≤ 0.0005 % | 
| Fe (Iron) | 
≤ 0.0005 % | 
| Hg (Mercury) | 
≤ 0.00010 % | 
| Pb (Lead) | 
≤ 0.00005 % | 
| Zn (Zinc) | 
≤ 0.0005 % | 
| Other residual solvents (ICH Q3C) | 
…excluded by production process | 
| Reducing substances (Ph Eur) | 
passes test | 
| Substances reducing potassium permanganate | 
passes test | 
| Evaporation residue | 
≤ 0.005 % | 
| 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, JP, USP, E260 
Conforms to the purity criteria on food additives according to the current European Commission Regulation. | 
 
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