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Environmental fate & pathways

Adsorption / desorption

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Endpoint:
adsorption / desorption: screening
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Endpoint:
adsorption / desorption, other
Remarks:
other: calculation of log Koc for ionized molecule
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
supporting study
Study period:
2008
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
no guideline followed
GLP compliance:
no
Key result
Type:
Koc
Value:
49 L/kg
Remarks on result:
other: pH 5.0
Key result
Type:
log Koc
Value:
1.69 dimensionless
Remarks on result:
other: pH 5.0
Key result
Type:
Koc
Value:
49 L/kg
Remarks on result:
other: pH 7.0
Key result
Type:
log Koc
Value:
1.69 dimensionless
Remarks on result:
other: pH 7.0
Conclusions:
The Koc of the substance was calculated following Franco & Trapp (2008) to be 49 (logKoc = 1.69) at pH 5 and 7.

Description of key information

The Koc of the substance was calculated following Franco and Trapp (2008) to be 49 (logKoc = 1.69) at pH 5 and 7.

Key value for chemical safety assessment

Koc at 20 °C:
49

Additional information

Since the test substance's physicochemical properties indicate a low potential for adsorption (log Kow = -0.26), no study needed to be conducted according to REACH Annex VIII 9.3.1 column 2. Nevertheless, estimates of the Koc were made according to Franco and Trapp (2008) yielding Koc value of 49 (logKoc = 1.69) at pH 5 and 7. A pKa of 9.78 and a log Pow of -0.26 (uncharged molecule) were used as input parameters.

As pH 7 is considered most representative as environmental pH, the related Koc is used as the key value for the chemical safety assessment.