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EC number: 267-956-0
CAS number: 67953-76-8
Although biodegradation in soil has not been demonstrated for HEDP-H and
its salts, the role of abiotic removal processes is significant.
The key data for soil 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. 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 in the regional and continental scales. This abiotic
removal rate is used in the chemical safety assessment of HEDP-H and its
Two reliable studies of biodegradation in soil are available. Soil
biodegradation rates of between 6.7 and 28.2% over 119 days in four
soils were determined (Saeger et al., 1977). A soil biodegradation rate
of 47% over 148 days in silt-loam soil was determined (Saeger 1978).
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