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Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Remarks:
other: Kpcomp determination
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
No data
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
Reference document cited in ECHA Guidance on IR/CSA on risk assessment for metals and metal compounds
Principles of method if other than guideline:
The partition coefficients of zinc between particulate matter, soil or suspended solids and water were estimated from the measurements of metals in water samples collected between 1983 and 1986.
GLP compliance:
not specified
Key result
Phase system:
solids-water in suspended matter
Type:
log Kp
Value:
ca. 5.04 dimensionless
Key result
Phase system:
solids-water in soil
Type:
log Kp
Value:
ca. 2.2 dimensionless
Key result
Phase system:
solids-water in sediment
Type:
log Kp
Value:
ca. 4.86 dimensionless

None

Conclusions:
The Log Kpcomp were derived and used in a RIVM Report to set reference concentrations. The estimated value of partition coefficient of zinc between particulate matter and water derived from measurements of metals in water samples of 4 locations in the Netherlands from 1983-1986 was reported to be 5.04. The estimated value of partition coefficient of zinc between solids and water in soil based on values originating from a literature study using batch experiments was reported to be 2.2. The estimated value of partition coefficient of zinc between solids and water in sediment on the basis of partition coefficients between particulate matter and water was reported to be 4.86.
Executive summary:

The Log Kpcomp were derived and used in a RIVM Report to set reference concentrations. The  estimated value of partition coefficient of zinc between particulate matter and water derived from measurements of metals in water samples of 4 locations in the Netherlands from 1983-1986 was reported to be 5.04. The  estimated value of partition coefficient of zinc between solids and water in soil based on values originating from a literature study using batch experiments was reported to be 2.2. The estimated value of partition coefficient of zinc between solids and water in sediment on the basis of partition coefficients between particulate matter and water was reported to be 4.86 (Crommentuijn, 1997).

Description of key information

The information requirement on adsorption coefficient (log Koc) is waived for the organic moiety of the substance since zinc methacrylate is readily biodegradable and has low log Kow. The environmental concern is related to the zinc moiety of the substance. Partitioning coefficients Kp are determined according to values discussed in the EU Risk assessment report for Zinc. In order to address the environmental concern potentially to the zinc moiety of the substance, the data available for zinc sulphate are used for risk assessment.

Key value for chemical safety assessment

Other adsorption coefficients

Type:
log Kp (solids-water in sediment)
Value in L/kg:
4.86
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in suspended matter)
Value in L/kg:
5
at the temperature of:
20 °C

Other adsorption coefficients

Type:
log Kp (solids-water in soil)
Value in L/kg:
2.2
at the temperature of:
20 °C

Additional information

In the case of metal and metal compound, the use of Kow and Koc to estimate the partitioning between media is not applicable. The sorption of zinc is considered to be controlled by prevailing environmental conditions such as hydroxides, clay minerals, organic matter. Therefore, the adsorption/desorption between the aqueous phase and the relevant compartments (suspended matter, sediment and soil) need to be described by partitioning coefficients (Kpcomp). Such partitioning coefficients have been identified in a RIVM Report (cited in the EU risk assessment report) and are proposed to be used for the purpose of the chemical safety assessment of the registered substance.


The Log Kpcomp were derived and used in a RIVM Report to set reference concentrations. The estimated value of partition coefficient of zinc between particulate matter and water derived from measurements of metals in water samples of 4 locations in the Netherlands from 1983-1986 was reported to be 5.04. The estimated value of partition coefficient of zinc between solids and water in soil based on values originating from a literature study using batch experiments was reported to be 2.2. The estimated value of partition coefficient of zinc between solids and water in sediment on the basis of partition coefficients between particulate matter and water was reported to be 4.86 (Crommentuijn, 1997).