EDTA DISODIUM SALT (pack size 1 kg)

A salt of an organic acid (Ethylenediaminetetraacetic Acid, disodium salt) used in aqueous solutions with other reagents and inert materials for the preparation of cleaning mixtures and poultices to be applied to stone surfaces and frescoes. EDTA disodium salt, for its property of complexing calcium within crusts and for its good solubility (better than tetrasodium salt), is used in the AB 57 poultice (I.C.R. formulation - Rome). It is besides a strong chelating agent of a great many metallic cations, as iron and copper; this property can be utilized to remove stains of rust or copper green from stone surfaces, wood, plasters, etc…



PHYSICAL AND CHEMICAL PROPERTIES:



- Formula: [CH2N(CH2COOH)CH2COONa]2·2H2O

- Appearance: white crystals

- Assay: 99% min.

- Specific gravity: 0.8 - 1.1 kg/l at 20°C

- pH: 4,5-5 in 10% aqueous solution