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EC number: 267-956-0
CAS number: 67953-76-8
A number of simulation studies are available and provide a consistent
weight of evidence for a lack of significant biodegradation under STP
and aquatic simulation conditions in the absence of other factors.
Although biodegradation in sediment has not been demonstrated for HEDP-H
and its salts, the role of abiotic removal processes is
significant. The key data for sediment adsorption are from the study by
Michael (undated) (refer to Section 5.4.1 for further information about
this test). There is no evidence for desorption occurring. Effectively
irreversible binding is entirely consistent with the known behaviour of
complexation and binding within crystal lattices. The high levels of
adsorption which occur are therefore a form of removal from the
environment. The potassium salt can be expected to have equivalent
properties. After approximately 40-50 days, the phosphonate is >95%
bound to sediment with only 5% extractable by ultrasonication and use of
0.25N HCl-xylene solvent (based on radiolabelling) in river and lake
water microcosms (Monsanto internal report, cited by Gledhill and
Feijtel, 1992). 66-80% removal (binding) is seen after 11 days in the
same test. In the context of the exposure assessment, largely
irreversible binding is interpreted as a removal process; 5% remaining
after 40 - 50 days is equivalent to a half-life of 10 days which is
significant for the environmental exposure assessment on the regional
and continental scales. This abiotic removal rate is used in the
chemical safety assessment of HEDP-H and its salts.
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