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EC number: 701-247-3 | CAS number: -
PNEC sediment using Equilibrium Partitioning Method:
The following formula is applied:
Predicted No Effect Concentration in water
bulk density of wet suspended matter
partition coefficient suspended matter water
Predicted No Effect Concentration in sediment
[mg.kg-1of wet sediment]
Ksusp water= Fwatersusp+ Fsolidsusp*Kpsusp/1000*RHOsolid
fraction water in compartmentcomp
fraction solids in compartmentcomp
density of the solid phase
solids-water part. coeff. in compartmentcomp
partition coefficient organic carbon-water
1,896 calculated with EPIWIN 4.00
weight fraction of organic carbon in compartmentcomp
partition coefficient solid-water in suspended matter
Therefore PNEC sediments = 0,9474*0,07*1000/1150 = 0.0577 mg/kg
The value of Ksusp-water of 0,9474 is consistent with the calculated value with EUSES 2.1.1. The tool gives 0,913 putting a Koc QSAR for organic acids and 0,979 for non hydrophobic substances
PNEC marine sediment using Equilibrium Partitioning Method:
Being marine PNEC usually derived by freshwater PNEC with an adding assessment factor of 10, consequently the marine sediment PNEC can be directly derived from PNEC sediment with an assessment factor of 10.
Therefore PNEC marine sediments = 0.0577*0.1 = 0.00577 mg/kg
PNEC soil using Equilibrium Partitioning Method:
Results with EUSES 2.1.1 for Ksoil-water: 0.228 – 0.307
partition coefficient soil water
Predicted No Effect Concentration in soil
Ksoil water= Fairsoil*Kair-waterl+Fwatersoil+ Fsolidsoil*Kpsoil/1000*RHOsolid
fraction water in compartmentsoil
fraction solids in compartmentsoil
fraction air in compartment comp (only relevant for soil)
solids-water part. coeff. in compartmentsoil
air-water partitioning coefficient
weight fraction of organic carbon in compartmentsoil
partition coefficient solid-water
Kair-water= 149(Henry constant at environmental temperature)/285(T°K)/8.314(R, gas constant) =0,0629
Therefore PNEC soil = 0,269/1150*0,07= 0,016 mg/kg
None of the studies shows a value leading to classification for the environement both according to 67/548 and to CLP regulation.
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