Registration Dossier
Registration Dossier
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EC number: 205-187-4 | CAS number: 135-37-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
For EDG a worst-case log Koc of 1 was calculated (Mensink, 2013, EPIWIN4.1, MCI method).
Additionally, the sorption characterictics of the structurally comparable trisodium nitrilotriacetate (Na3NTA) were determined in studies conducted by Dunlap et al. (1971), Bolton et al. (1993) & Baek & Clesceri (1986). These results clearly indicate that the substance is not strongly adsorbed to soils and sediments.
Key value for chemical safety assessment
- Koc at 20 °C:
- 10
Other adsorption coefficients
- at the temperature of:
- 20 °C
Additional information
For EDG a worst-case log Koc of 1 was calculated (Mensink, 2013, EPIWIN4.1, MCI method). In the same report also a log Kow of - 8.27 was calculated. As the water solubility is high (75 -80% w/w at 20C), the substance is considered hydrophilic.
Additionally, data for the structurally comparable NTA have been used to illustrate and confirm the sorption characteristics.
Trisodium nitrilotriacetate (Na3NTA) is a highly water-soluble organic substance. The aqueous solubility of Na3NTA is 640 g/L. It is also very hydrophilic, judging by its log octanol-water partition coefficient of -13.2 at pH 7. In addition, a relevant adsorption of Na3NTA onto the oragnic fraction of soils, sediments or suspended solids is not expected due to the ionic structure of the substance. However, interaction with the mineral phase may be possible.
This assumption is supported by the studies conducted by Dunlap et al. (1971) and Bolton et al. (1993). Dunlap et al. (1971) could clearly demonstrate that Na3NTA (-> radiochemical analyses) is not strongly sorbed by loam, clay-loam and sand soils tested. This finding is further supported by the study results of Bolton et al. (1993) who determined the distribution of radiolabeled Na3NTA between a marine surface sediment and a mineral medium. A relatively low distribution coefficient Kp of 1.6 l/kg was determined after 24 h after using sediments that had been stored at 4 °C.
Baek & Clesceri 1986 concluded that adsorption plays a minor role in NTA removal in sandy soils.
[LogKoc: 1.0]
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