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Environmental fate & pathways

Adsorption / desorption

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Description of key information

 Based on the results of the study performed with Isostearic acid, esters with methyl α-D-glucoside and calculation performed for the main components of Stearic acid, esters with methyl α-D-glucoside and taking into account the classification of Blume & Ahlsdorf (1993), a high to very high sorption of Stearic acid, esters with methyl α-D-glucoside onto soil organic matter is to be expected. 

Key value for chemical safety assessment

Koc at 20 °C:
427 000

Additional information

An experimental study to the read across substance Isostearic acid, esters with methyl α-D-glucoside is available. Based on the structural analogue approach to Stearic acid, esters with methyl α-D-glucoside, read across from Isostearic acid, esters with methyl α-D-glucoside, is considered acceptable.

The soil sorption coefficient Koc (log Koc) of the read across substance Isostearic acid, esters with methyl α-D-glucoside was determined in a study conducted according to OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC) 2001) and EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC) 2008). The log Koc of the major component of Isostearic acid, esters with methyl α-D-glucoside was determined to be >5.63 (Koc>427000).

The value is supported by calculation performed for the main components of Stearic acid, esters with methyl α-D-glucoside. The calculation yielded a Koc=5986 L/kg (log Koc=3.777); Koc=3.047x10E+7 L/kg (log Koc=7.484); Koc=3.757x10E+12 L/kg (log Koc=12.575) and Koc=2.611x10E+17 L/kg (log Koc=17.417) Kow method for mono-, di-, tri- and tetraester respectively. The soil sorption coefficient of Stearic acid, esters with methyl α-D-glucoside was calculated using EPIWIN v 4.00, KOCWIN v 2.00. Due to missing information about the applicability of the calculation model in respect to the substance under investigation the result and the conclusion thereof should be treated with care.

Both methods estimated a very high sorption of Stearic acid, esters with methyl α-D-glucoside onto soil organic matter.

Due to all technical difficulties at experimental test performed for measurement of adsorption/desorption potential of the read across substance in particular and substances of complex and variable composition in general, and taking into account that the calculation yielded similar results no further measurements for the endpoint Adsorption/desorption were performed.