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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Decomposition of the test substance (> 340 °C) before the melting point is reached.

Key value for chemical safety assessment

Additional information

A TGA/DTA curve and FTIR spectra for characterization of sodium nitrilo-triacetate monohydrate were determined.

Sodium nitrilo-triacetate monohydrate shows a reversible dehydration between 120°C and 215°C. The second transition is degradation beginning slowly at 340°C, the rapidly at 390°C until 421°C, with maximum weight loss rate occurring at 410°C. After this initial degradation phase further slower degradation occurs. Remaining sample has transformed from a white crystalline solid to a black char.

Thus, the decomposition is beginning slowly at 340°C.

Several additional handbook and database data confirm, that the test substance decomposes before reaching the melting point.