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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Description of key information

Melting point K3EDTA: 252°C (decomposition)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
252 °C

Additional information

Based on read-across from related substance disodium dihydrogen ethylenediaminetetraacetate a melting point value of 252°C was sourced from authoritative handbooks which considered reliable and therefore assigned as key study; melting point values of 240°C and 245°C are obtained from a authoritative database and from a handbook and, therefore, support the key study. In all cases the test substance is decomposed at or below melting temperature. One melting point is reported for the potassium salt dihydrate, but was not used due to reliability concerns.

Due to the similar EDTA-anion of the potassium and sodium salts and under the assumption of the decomposition of the organic anion (and not the inorganic cation) at melting temperature, a read-across is scientifically justified.