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Environmental fate & pathways

Adsorption / desorption

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Description of key information

EU risk assessment report, p.18 -19 (2009), 3.1.3.2.1 Adsorption:
The Koc was calculated from the QSAR regression provided for organic acids in the TGD (logKoc = 0.60 logKow + 0.32), resulting in a Koc of 229 (logKoc of 2.36) (undissociated form). The Koc was normalised to pH 5 and pH 7 using the corrected logKow values, respectively. For pH 7, a pH–normalised Koc of 6 results. This value is used in the calculation of the solid-water partition coefficients. The solids-water partitioning coefficients for pH 7 are according to the TGD as follows: Kpsoil = 0.119 l kg-1, Kpsed = 0.299 l kg-1 and Kpsusp = 0.597 l kg-1. For pH 5, a pH–normalised Koc of 85 results. This value is used in the calculation of the solidwater partition coefficients. The solids-water partitioning coefficients for pH 5 are according to the TGD as follows: Kpsoil = 1.7 l kg-1, Kpsed = 4.24 l kg-1 and Kpsusp = 8.48 l kg-1.

Key value for chemical safety assessment

Koc at 20 °C:
6

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
0.119
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in sediment)
Value in L/kg:
0.299
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in suspended matter)
Value in L/kg:
0.597
at the temperature of:
20 °C

Additional information

EU risk assessment report, p. 19 (2009), 3.1.3.3 Accumulation and metabolism: According to the very low Koc in the environmentally relevant pH-range, no significant geoaccumulation is to be expected.

[LogKoc: 0.78]