Registration Dossier
Registration Dossier
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EC number: 274-798-6 | CAS number: 70714-66-8
Endpoint summary
Administrative data
Description of key information
Based on the relevant physical-chemical properties, the known use pattern (release to water) and assuming no biodegradability, DTPMP acid and its salts will partition primarily to water and suspended sediments. In the sewage treatment plant the substance is not expected to degrade, but will be removed on sewage sludge (80%) and be present in the effluent (20%).
Additional information
The distribution in a sewage treatment plant has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2) to be 0% degraded, 20% to water, 80% to sewage sludge and 0% to air (see Section 9 of the CSR for further information). These outputs are based on non-biodegradability and the relevant physical-chemical properties 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 DTPMP, attributed largely to adsorption to amorphous precipitated iron oxides (Nowack, 2002). Measurements of one WWTP performance showed a removal of 93%; another WWTP site showed 95% removal at the biological treatment stage with a further 2% removal at the flocculation (iron salts treatment) step.
DTPMP and its salts adsorb strongly to inorganic surfaces, soils and sediments, in model systems and mesocosms, despite the very low log Kow and this represents a route of abiotic removal from the environment, which has implications for the approach to environmental fate modelling.
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