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Using a fugacity based model (Mackay Level 1) HMDTMP is predicted to
migrate to the soil and aquatic sediment compartments when modelling
using a substitute log Kow (selected to generate an indicative Koc).
Table: level I outputs using an adjusted log Kow
The Level III program has also been applied, with the default model,
using the same input parameters and
the adjusted log Kow. The resulting distribution between compartments is
Table: Level III outputs using an adjusted log Kow
For the known use pattern, the most likely emission route will be
directly to water. Direct emission to soil via spreading of sludge from
waste water treatment plants is also possible. The results reflect that
most HMDTMP found in air would be precipitated to soil, and that there
is very little movement between soil and water, because transfer via the
air compartment is very slow, for a substance of low volatility. In
water, the adsorption coefficient of HMDTMP results in significant
adsorption to sediment.
The distribution in a sewage treatment plant has been estimated using
the SimpleTreat model (implemented in EUSES 2.1.2) to be 0% degraded,
16% to water, 84% to sewage sludge. These outputs are based on
non-biodegradability, and the properties given above for the
fugacity-modelling of distribution. There is evidence from literature
that wastewater treatment plants using a purification step with iron and
aluminium salt additives to remove phosphorus, can be expected to
achieve more than 90% removal of the analogous phosphonate complexing
agent DTPMP, attributed largely to adsorption to amorphous precipitated
iron oxides (Nowack, 2002).
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