Acetic acid, chloro-, sodium salt, reaction products with 4,5-dihydro-2-undecyl-1H-imidazole-1-ethanol and sodium hydroxide

Adsorption / desorption

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

adsorption / desorption: screening

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance and its relevant degradation products decompose rapidly

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
In accordance with column 2 of REACH Annex VIII and IX, the study adsorption/desorption does not need to be conducted as the substance has a low Log Kow and is readily biodegradable.

Reference 2

Endpoint:

adsorption / desorption

Type of information:

(Q)SAR

Adequacy of study:

supporting study

Study period:

N/A

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: The organic carbon-normalized sorption coefficient for soil and sediment; i.e. Koc, of this substance has been calculated with EUSES version 2.1, based on logKow, by using the default QSAR model (for non-hydrophobics).

Principles of method if other than guideline:

As the screening study (OECD 121) is technically not feasible and the OECD 106 study has not been performed, the only available option is to calculate the organic carbon-normalized sorption coefficient for soil and sediment (Koc). The Koc of the substance has been calculated with EUSES version 2.1, based on logKow, by using the in EUSES default QSAR for the chemical class non-hydrophobics:
Koc = (10.47 x Kow^0.52)/1000 (with Koc in m3/kg)

GLP compliance:

no

Key result

Type:

Koc

Value:

3.16 L/kg

Temp.:

20 °C

Key result

Type:

log Koc

Value:

0.5 dimensionless

Temp.:

20 °C

Validity criteria fulfilled:

not applicable

Conclusions:

The organic carbon-normalized sorption coefficient for soil and sediment; i.e. Koc, of this substance has been calculated with EUSES version 2.1, based on logKow, by using the default QSAR model (for non-hydrophobics). The calculated Koc and logKoc values are 3.16 and 0.5, respectively.

Description of key information

As the surfactant part of the substance is present as sodium carboxylates at environmental pH, the substance is expected to partition predominantly to the aquatic compartment and minimally adhere to organic matter.

For the environmental CSA, the Koc of the substance has been calculated based on logKow. The calculated Koc value is 3.16 L/kg.

Key value for chemical safety assessment

Koc at 20 °C:

3.16

Additional information

As the screening study (OECD 121) is technically not feasible and the OECD 106 study has not been performed, the only available option is to calculate the organic carbon-normalized sorption coefficient for soil and sediment (Koc). The Koc of the substance has been calculated with EUSES version 2.1, based on logKow, by using the in EUSES default QSAR for the chemical class non-hydrophobics: Koc = (10.47 x Kow^0.52)/1000 (with Koc in m3/kg). The calculated Koc and logKoc values are 3.16 and 0.5, respectively.