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EC number: 287-370-9 | CAS number: 85480-89-3
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The normal approach to modelling binding behaviour in environmental exposure assessment takes its approach from an inherent assuption that the substance is binding only to the organic components of substrates (i.e. organic carbon present in soils, sediments, and WWTP sludges). This assumption does not apply to EDTMP and its salts.
DTPMP and its salts adsorb strongly to inorganic surfaces, soils and sediments, in model systems and mesocosms; this has implications for the approach to environmental fate modelling. High adsorption is consistent with similar behaviour seen for structural analogues, and other common complexing agents such as EDTA.
The nature of the adsorption is believed to be primarily due to interaction with inorganic substrate. While Koc is the conventional indicator for adsorption, there is not necessarily any interaction with organic carbon present in the substrate in the case of these substances.
Key value for chemical safety assessment
Additional information
The normal approach to modelling binding behaviour in environmental exposure assessment takes its approach from an inherent assumption that the substance is binding only to the organic components of substrates (i.e. organic carbon present in soils, sediments, and WWTP sludges). This assumption does not apply to EDTMP and its salts.
EDTMP and its salts adsorb strongly to inorganic surfaces, soils and sediments, in model systems and mesocosms; this has implications for the approach to environmental fate modelling. High adsorption is consistent with similar behaviour seen for structural analogues, and other common complexing agents such as EDTA.
The nature of the adsorption is believed to be primarily due to interaction with inorganic substrate. While Kocis the conventional indicator for adsorption, there is not necessarily any interaction with organic carbon present in the substrate in the case of these substances.
A log Kocvalue of ca. 3.07 was obtained by evaluating Ksediment-water datain a reliable study conducted according to generally accepted scientific principles (Michael, 1979). River sediments were analysed by using liquid scintillation on day 0, 1,2, 4, and 8. Methods and sample data were represented clearly and the test substance was being described adequately. The result considered as reliable and has been assigned as key study.
A paper (Jaworska, 2002) supported the measured data for water sediment studies.
Studies were also carried out on two phosphonates (Nowack and Stone, 1999), examining adsorption to goethite substrate. Very high and rapid adsorption processes were reported in both cases. Another study (Nowack, 2002) has reported the same phenomena using active sludge as testing medium. These are treated as supporting studies.
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