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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 April 2004
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Qualifier:
according to guideline
Guideline:
other: QSARs given in Technical Guidance document iח support of Commission Directive 93167/EEC on Risk Assessment for new notified substances and Commission Regulation (EC) 1488/94 on Risk Assessment for existing substances.
Deviations:
not specified
GLP compliance:
no
Type of method:
other: QSAR
Radiolabelling:
no
Key result
Type:
log Koc
Value:
>= 5.7 dimensionless
Remarks on result:
other: QSAR estimation - information on pH, temperature, matrix and % org. carbon are not available.
Validity criteria fulfilled:
not applicable
Remarks:
QSAR estimation
Conclusions:
Due to the nature of Hatco1 5127, experimental determination of Koc is not possible. As an alternative, log Koc is calculated using one of the QSARs given in Technical Guidance document in support of Commission Directive 93167/EEC no Risk Assessment for new notified substances and Commission Regulation (EC) 1488/94 on Risk Assessment for existing substances.
Based on a water solubility of < 0.14x10^-3 g/l (see NOTOX project 388035: “Determination of the water solubility of Hatcol 5127"} and based on its molecular formula, Hatcol 5127 was classified as hydrophobic. For this chemical class, log Koc is calculated using the equation:
logKoc =0.81 logPow / 0.10
The partition coefficient, Pow, of Hatcol 5127 was determined to be ≥ 7.7x10^6 (log Pow ≥6.9) {see NOTOX project 388068: "Determination of the partition coefficient (n-octanol/water) of Hatcol 5127").
Using this log Pow value and the above given equation, log Koc of HATCOL 5127 be ≥ 5.7.

Description of key information

log Koc of HATCOL 5127 was determined to be ≥ 5.7 by QSAR estimation using the partition coefficient (n-octanol/water) log POW value.

Key value for chemical safety assessment

Additional information

Due to the nature of Hatco1 5127, experimental determination of Koc is not possible. As an  alternative, log Koc is calculated using one of the QSARs given in Technical Guidance document in support of Commission Directive 93167/EEC no Risk Assessment for new notified substances and Commission Regulation (EC) 1488/94  on Risk Assessment for existing substances.

Based on a water  solubility of < 0.14x10^-3 g/l (see NOTOX project 388035: “Determination of the water solubility of Hatcol 5127"} and based on its molecular formula, Hatcol 5127 was classified as hydrophobic. For this chemical class, log Koc is calculated using the equation:

logKoc =0.81 logPow / 0.10

The partition coefficient, Pow, of Hatcol 5127 was determined to be ≥ 7.7x10^6 (log Pow ≥6.9) {see NOTOX project 388068: "Determination of the partition coefficient (n-octanol/water) of Hatcol 5127").

Using this log Pow value and the above given equation, log Koc of HATCOL 5127 be ≥ 5.7.