"E 345 (i) TRIMAGNESIUM DICITRATE |
Synonyms | Magnesium citrate; trimagnesium citrate |
Definition |
Einecs | 222-093-9 |
Chemical name | Trimagnesium bis (2-hydroxypropane-1,2,3- tricarboxylate), anhydrous |
Chemical formula | (C6H5O7)2 Mg3 |
Molecular weight | 451,12 (anhydrous) |
Assay | 15,0-16,5 % Mg on dry substance/matter equal to 92,8-102,1 % trimagnesium dicitrate anhydrous |
Description | White or almost white, fine, slightly hygroscopic powder |
Appearance of a solution | Not more opalescent than ref. susp. III and not more intensely coloured than ref. sol. Y7 or BY6 |
Identification |
Test for citrate | Positive |
Test for magnesium | Positive |
pH (5 % solution) | 6,0-8,5 |
Solubility | Soluble in water, practically insoluble in ethanol (96 %), it dissolves in diluted hydrochloric acid. |
Particle size | by STEM method – Median (D50) particle size (number-based) not below 130 nmby laser diffraction method – Median (D50) particle size (mass-based) not below 50 μm |
Purity |
Loss on drying | Maximum 3,5 %, determined on 1000 g by drying in an oven at 180 ± 10 °C for 5 h |
Oxalic/oxalate | ≤ 280 mg/kg (0,028 %) as oxalic acid |
Sulfates | ≤ 2000 mg/kg (0,2 %) |
Calcium | ≤ 2000 mg/kg (0,2 %) |
Iron | ≤ 100 mg/kg |
Mercury | ≤ 0,1 mg/kg |
Lead | ≤ 1 mg/kg |
Cadmium | ≤ 0,1 mg/kg |
Arsenic | ≤ 1 mg/kg |
Not identified material | No process or product related impurities. The unintended presence of hydrated forms of trimagnesium dicitrate such as the nonahydrate cannot be excluded." |