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Vapour pressure

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Description of key information

The vapour pressure of the 54% aqueous solution of EDTA-Zn(NH4)2 is expected to be comparable or slightly lower than water.

Key value for chemical safety assessment

Additional information

The commercial product Dissolvine E-ZN-9 (54% EDTA-Zn(NH4)2 aqueous solution) has no ammonia smell (ammonia odour threshold is 0.45 mg/m3).

Read across: The vapour pressure of Ethylenediaminetetraacetic acid, copper diammonium complex, 55% aqueous solution at 20°C is 2.03 ± 0.05 kPa, which is slightly lower than that of pure water (vapour pressure of water is 2.23 kPa at 20°C)

For the solid substance EDTA-Zn(NH4)2 the endpoint can be waived: as the substance is very low volatile and thus has a negligable vapour pressure.

Based on its multiple carboxylic acid salt functionality the pure substance will exhibit negligible vapor 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.