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EC number: 701-237-9
CAS number: -
solubility: Commercially available HEDP (1-2Na) in the form of aqueous
solution products at typically approx 20% w/w are miscible in water.
Furthermore the commercial availability of aqueous solutions at this
typical concentration shows that HEDP (1-2Na) salt is soluble up to at
least 20% w/w. The disodium salt of HEDP is 'freely soluble' in water
based on a standard chemical data handbook.
In support of the Key data, it is notable that in general, phosphonate
salts are highly hydrophilic and extremely water soluble. Free acids are
less soluble than the salts; however, aqueous solutions in excess of 1%
active acid material can be prepared.
The parent acid (HEDP-H) substance was reported as very soluble in water
with a concentration of 69% at 20°C but it is not clear from the source
report whether this is expressed as %w/w, %v/v or %w/v. Since the
solution density is much higher than 1, the equivalent water solubility
in g/L using density and concentration is reported as ≥690 g/L. In
addition, as the value is known to be extremely high, the exact value is
considered not significant for the chemical safety assessment for human
health or environment and this limit value is therefore sufficient and
is considered to be reliable.
A measured water solubility of 774 g/L at 20°C for the tetrasodium salt
of HEDP is available.
A water solubility value of 680
g/L was reported in secondary literature for HEDP acid. The original
reference was not available for review and no further information is
available. The reliability of this result is not assignable and has been
assigned to be supporting study.
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