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Environmental fate & pathways

Adsorption / desorption

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Description of key information

According to Annex VIII and IX of the REACH Regulation EC n. 1907/2006, Column 2, the study 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). Based on the evaluation of the experimental Log Kow data,  it could be assumed that the substance has not a potential adsorpion property on sediment and soil compartments.

The estimated values for the substance, as constituent 2 are:

Log Koc (estimation MCI method) = 2.83

Log Koc (estimation Kow method) = 1.39

The estimated values of the Similar substance 01 is

Log Koc= 2.62


Key value for chemical safety assessment

Koc at 20 °C:
674.2

Additional information

The sorption or binding behaviour of chemicals to sediment is determined by certain properties. Especially substances with high Log Kow or Log Koc values adsorb to the organic fraction of the sediment and soil. In general substances with a Koc <500-1000 L/kg are not likely sorbed to sediments (SETAC 1993). According to this, a log Koc or log Kow of >=3is used as trigger value for sediment effect assessment although other concentration or combinations of triggers might be important as well (e.g. binding to sediment particles) that is not Kow/Koc driven, but where for instance the distribution coefficient Kd is important, persistence in the sediment compartment. Substances with a high potential to adsorb onto sediment (e.g. log Kow >5 or Log Koc >3) require sediment assessment even at tonnages below 1000 t/y. Substances with tonnages below 1000 t/y and a not having a high potential for adsorption (e.g.log Kow <5 or log Koc <3) do not normally need a sediment risk assessment.

The same triggers as for parent compounds (e.g. log Koc >3) can be applied to degradation products.

If it is foreseeable that degradation products accumulate in the sediment or soil compartment, testing of degradation products might be necessary. Results from biodegradability test on similar substance indicates non-biodegradability in water.

Based on the Read Across approach, also the substance under evaluation is not biodegradable, therefore no degradation products are expected in water compartment, and their accumulation in sediments and soil.

 

The estimated values for the substance are lower than 3 (Log Koc (estimation MCI method) = 2.83 Log Koc (estimation Kow method) = 1.39) and this could suggest a low potential adsorption property on sediment and soil compartments.

However, they are estimated value, while is available an experimental Kow that can be evaluated, being compared to the >=3 trigger value. The Log Pow experimental, based on the OECD Guideline 117 was stated at < 0.3.

Furthermore, the substance has a high solubility (87.75 ± 1.53 g/L).

As conclusion, it can be assumed that the substance has a low potential adsorption property on sediment and soil compartments.

[LogKoc: 2.83]