Assay (iodometric): ≥ 99.0 %

Chloride (Cl): ≤ 0.005 %

Sulfate (SO₄): ≤ 0.02 %

Total nitrogen (N): ≤ 0.005 %

Fe (Iron): ≤ 0.01 %

K (Potassium): ≤ 0.005 %

Na (Sodium): ≤ 0.2 %

Substances precipitated by ammonia: ≤ 0.02 %

Loss on Drying (105 °C): ≤ 1.0 %

for analysis EMSURE® ACS,ISO,Reag. Ph Eur

Synonym(s): 2-Hydroxypropane-1,2,3-tricarboxylic acid, Hydroxytricarballylic acid

Linear Formula: HOC(COOH)(CH2COOH)2 · H2O

Assay (acidimetric, calc. on anhydrous substance): 99.5 - 100.5 %

Identity (IR-spectrum): passes test

Appearance: white to almost white or colorless crystals

Appearance of solution (200 g/l; water): clear (≤ 3 NTU) and not more intense in color than reference solution Y₇, BY₇ or GY₇

In water insoluble matter: ≤ 50 ppm

Chloride (Cl): ≤ 5 ppm

Phosphate (PO₄): ≤ 10 ppm

Sulphate (SO₄): ≤ 20 ppm

Heavy metals (as Pb): ≤ 5 ppm

Al (Aluminium): ≤ 0.2 ppm

As (Arsenic): ≤ 1 ppm

Hg (Mercury): ≤ 1 ppm

Cu (Copper): ≤ 5 ppm

Fe (Iron): ≤ 3 ppm

Fe (Iron, acc. to Reag. Ph  Eur.): suitable to use in the limit test for iron

Pb (Lead): ≤ 0.5 ppm

Oxalates (as C₂H₂O₄): ≤ 50 ppm

Readily carbonisable substance: passes test

Sulfated ash: ≤ 200 ppm

Water (according to Karl Fischer): 7.5 - 8.8 %

Corresponds to ACS, ISO 6353/2, Reag. Ph. Eur.