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Vapour pressure

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Description of key information

The vapour pressure of the 53% aqueous solution of DTPA-Fe(NH4)2 is expected to be comparable or slightly lower than water.

Key value for chemical safety assessment

Additional information

The commercial product Dissolvine D-Fe-6 (53% DTPA-Fe(NH4)2 aqueous solution) has no ammonia smell (ammonia odour threshold is 0.45 mg/m3).

Read across: The vapour pressure of Diethylenetriaminepentaacetic acid, ferric diammonium complex, 53% aqueous solution will be comparable to the vapour pressure of Ethylenediaminetetraacetic acid, copper diammonium complex, 55% aqueous solution at 20°C, which is 2.03 ± 0.05 kPa.

This is slightly lower than the vapour pressure of pure water, which is 2.23 kPa at 20°C)

For the solid substance DTPA-Fe(NH4)2 the endpoint can be waived as the substance is very low volatile and thus has a negligible vapour pressure.

Based on its multiple carboxylic acid salt functionality the pure substance will exhibit negligible vapour pressure. Because of its high polarity the substance always contains a few % of water so the vapour pressure exhibited by this substance is expected to be that of the adherent water.