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EC number: 701-068-0
CAS number: 2156592-58-2
Adsorption to soil, sediment and sewage sludge (OECD 106): 680-697 L/kg
at 20 °C
Below, no value for KOC / log KOC is given. This
is because partitioning of cationic surfactants to soil and sediment is
governed by ionic interaction (no correlation with organic carbon
content of soil). Calculation of the environmental partitioning based on
Koc alone would therefore result in erroneous predictions. For this
reason, instead of Koc compartment specific values for Kd (or Kp) are
given and used to calculate the distributrion in the environment.
Slangen (2000) studied the adsorption
behaviour of 1-14C-labelled n-octadecylamine in a batch equilibrium
experiment according OECD 106. Two soils collected in UK (Cranfield 164
soil, 21.8% clay, 6.6% organic matter, silt loam; Cranfield 266 soil,
50.2% clay, 2.6% organic matter, clay), one sediment collected in The
Netherlands (18.7% clay, 4.1% organic matter, silt loam) and a sewage
sludge (45.9% clay, 51.9% organic matter, silty clay) were used. The
adsorption isotherms determined by Slangen (2000) are non-linear.The
distribution constants for soils and sediment decrease dramatically as
the concentrations decrease.Apparently
extrapolation to low concentrations would lead to unrealistically low
results. Following the approach suggested by Danish EPA (2004) data
originating from the 2 lowest measured concentrations are used to
calculate Kd. Because there is no principal difference between soil and
sediments with respect to the sorption properties, as a worst case
approach the mean value for sediment obtained at the two lowest
equilibrium concentrations (707 and 687 L/kg) is also used for soils and
For the adsorption onto sludge, values of 687 and 674 L/kg were
determined for the 2 lowest concentrations. The mean value (680 LL/kg)
is used for the exposure calculation.
With a Kpsuspof 697 L/kg and a concentration of 15 mg/L
suspended matter in surface waters, the adsorbed fraction is calculated
EPA (2004): Pesticides Research 63, Scenarios and Model Describing Fate
and Transport of Pesticides in Surface Water for Danish Conditions.
Appendix D - Uncertainty Analysis of the Registration Model. Version 1.0
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