乙二胺四乙酸二钾盐二水合物 [EDTA二钾盐]，Ethylenediaminetetraacetic acid dipotassium salt dihydrate；for analysis, ≥99.0%

Assay (complexometric; calculated on dried substance): ≥ 99.0 %
Identity (IR): conforms
Identity (Potassium): conforms
Appearance of solution (50 g/l; water): Clear and colourless
pH (50 g/l; water): 4.0 - 5.0
In water insoluble matter: ≤ 0.003 %
Chloride (Cl): ≤ 0.004 %
Sulfate (SO₄): ≤ 0.01 %
Cyanide (CN): ≤ 0.001 %
Heavy metals (as Pb): ≤ 0.0005 %
Cu (Copper): ≤ 0.0001 %
Fe (Iron): ≤ 0.001 %
Nitrilotriacetic acid: ≤ 0.05 %
Loss on drying (150 °C; 6 h): 8.5 - 9.5 %

 

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