Registration Dossier
Registration Dossier
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EC number: 203-057-1 | CAS number: 102-81-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to the solid soil phase is not to be expected under environmentally relevant conditions.
Key value for chemical safety assessment
Additional information
According to Regulation (EC) No 1907/2006, Annex VIII, Section 9.3.1, Column 2, the study on adsorption/desorption screening does not need to be conducted if based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient), or the substance and its relevant degradation products decompose rapidly. Dibutylethanolamine is readily biodegradable (according to OECD criteria) (see IUCLID Ch. 5.2.1; BASF SE 2012, report no. 29G0286/05G008, BASF SE 2019, report no. 22G0286/05G024 and report no. 22G0286/05G025). In addition, the substance has a log Kow of 1.86 (see IUCLID Ch. 4.7; BASF AG 1993, report no. 93P00886.07; @20°C, pH 9.2). Therefore, a study does not need to be conducted.
At environmentally relevant conditions, Dibutylethanolamine will be present in it's ionised form (pKa = 10.3; BASF SE 2012, report no. 11L00536). The adsorption coefficient was determined in a study according to OECD guideline 121. The log Koc was determined to be 2.0 at 23 °C and pH 7.0 (BASF SE, 2013, report no. 11L00536). At pH 9, the log Koc was determined to be 4.6. However, as 98% of the European soils have a pH within a range of 5 to 8, the value determined at pH 9 is not relevant for the assessment of the substances environmental fate. Therefore, the log Koc of 2.0 at pH 7.0 was used for futher assessment.
In addition, the Koc was estimated for the uncharged molecule using QSAR models. According to the MCI method of the KOCWIN v2.00 module of EPI Suite v4.11, Dibutylethanolaminehas a Koc of 49.12 L/kg and a log Koc of 1.7. The MCI module is more reliable than the log Kow method of KOCWIN v2.00, which estimates the Koc based on the n-octanol/water partition coefficient (log Kow of 1.86@20°C, pH 9.2; BASF AG 1993, report no. 93P00886.07). The latter method resulted in a Koc of 30 L/kg and a log Koc of 1.5.
In conclusion, adsorption to the solid soil phase is not expected under environmentally relevant conditions.
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