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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The substance has a low adsorption potential to soil and sediment.

Key value for chemical safety assessment

Additional information

Due to the fast hydrolysis of the substance this test was performed on the main hydrolysis product, the free acid. One study investigating the adsorption and desorption behaviour of the hydrolysis product of the substance to soil is available. This study was conducted as batch equilibrium method according to EPA PAG-N 163-1 and OECD Guideline 106 in a version prior to 1998. The test substance is relatively weakly absorbed to soil. Adsorption is related to soil organic matter and pH. The adsorption constants Kf(ads) of the substance calculated based on the Freundlich isotherms for the four test soils (clay loam, sandy loam, sand) ranged from 0.51 to 2.62 L/kg. The respective Koc(ads) values were in the range of 68 to 176 L/kg (mean 100 L/kg). The desorption constants Kf(des) of the substance, measured in two 24 hour steps, were greater than the corresponding adsorption Kf indicating some hysteresis. Correlation coefficients ranged from 0.987 to 1.000 in all isotherms. Correlation between organic content and adsorption for the investigated soils was significant, and was slightly improved by simultaneously taking also the pH into account. The test item was stable in the course of the study. The parental mass balance for the adsorption/desorption phase was > 90% except for one soil (clay loam). No major degradation product was observed.