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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
adsorption / desorption: screening
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Justification for type of information:
REPORTING FORMAT FOR THE ANALOGUE APPROACH
For further information please refer to read across justification in IUCLID section 13.
Reason / purpose for cross-reference:
read-across source
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Key result
Type:
log Kd
Value:
4.48 dimensionless
Matrix:
freshwater suspended matter
Remarks on result:
other: No further details were provided.
Key result
Type:
Kd
Value:
30.246 L/kg
Matrix:
freshwater suspended matter
Remarks on result:
other: No further details were provided.
Key result
Type:
log Kd
Value:
4.75 dimensionless
Matrix:
estuarine suspended matter
Remarks on result:
other: No further details were provided.
Key result
Type:
Kd
Value:
56.234 L/kg
Matrix:
estuarine suspended matter
Remarks on result:
other: No further details were provided.
Key result
Type:
log Kd
Value:
5.12 dimensionless
Matrix:
marine suspended matter
Remarks on result:
other: No further details were provided.
Key result
Type:
Kd
Value:
131.826 L/kg
Matrix:
marine suspended matter
Remarks on result:
other: No further details were provided.
Key result
Type:
log Kd
Value:
4.39 dimensionless
Matrix:
freshwater sediment
Remarks on result:
other: No further details were provided.
Key result
Type:
Kd
Value:
24.409 L/kg
Matrix:
freshwater sediment
Remarks on result:
other: No further details were provided.
Key result
Type:
log Kd
Value:
3.33 dimensionless
Matrix:
soil
Remarks on result:
other: No further details were provided.
Key result
Type:
Kd
Value:
2 120 L/kg
Matrix:
soil
Remarks on result:
other: No further details were provided.

Description of key information

Aquatic compartment
- Partition coefficient in freshwater suspended matter: Kpsusp= 30,246 L/kg (log Kp (pm/w) = 4.48) (50thpercentile)
- Partition coefficient in estuarine suspended matter: Kpsusp= 56,234 L/kg (log Kp (pm/w) = 4.75) (50thpercentile)
- Partition coefficient in marine suspended matter: Kpsusp= 131,826 L/kg (log Kp (pm/w) = 5.12) (50thpercentile)

- Partition coefficient in freshwater sediment: Kpsed = 24,409 L/kg (log Kp(sed/w) = 4.39) (50th percentile)


Terrestrial compartment
- Partitioning coefficient: Kd value soil: 2120 L/kg(log Kp (pm/w) = 3.33) (50thpercentile)

Key value for chemical safety assessment

Other adsorption coefficients

Type:
log Kp (solids-water in suspended matter)
Value in L/kg:
30 246
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in sediment)
Value in L/kg:
24 409
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
2 120
at the temperature of:
20 °C

Additional information

It was refrained from a test with Copper (II) pyrophosphate (copper(2+) diphosphate) as it was determined that in accordance with Section 2 of Annex XI of Regulation (EC) No 1907/2006 (REACH) testing is technically not possible as the relevant guideline (OECD 121) is not validated for this type of substance (inorganic).

Nevertheless relevant partitioning coefficients from read-across substances are available from literature and are considered appropriate Copper (II) pyrophosphate.

- For the aquatic compartment, the summaries from Heijerick and Van Sprang (2005 and 2008) have been agreed under the copper RAR (2008) and are used for the risk characterization.

- For the terrestrial compartments, in the RA report, preference has been given to the Sauvé et al dataset as it covers the widest range of soil conditions relevant for the risk assessment and these have been used for the risk characterization under the copper RAR (2008).

Information on short term and long term attenuation of copper in soils as a function of soil chemistry was assessed by Ma et al., 2006a & 2006b. The soil and environmental factors governing short term attenuation and ageing rates are soil pH, organic matter content, incubation time and temperature with soil pH being the key factor for ageing of Cu added to soil. 

From the field experiments and a mechanistic understanding of the decrease in bioavailable copper as a function of time following exposures, an ageing factor of 2 was derived as a reasonable worst case when considering field exposure data. This information is relevant to the soil PNEC derivation.