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EC number: 231-944-3
CAS number: 7779-90-0
For metals, the transport and distribution over the different
environmental compartments e.g. the water (dissolved fraction, fraction
bound to suspended matter), soil (fraction bound or complexed to the
soil particles, fraction in the soil pore water,...) is described and
quantified by the metal partition coefficients between these different
fractions. Information on these partition coefficients is given under
Partition coefficients for zinc in freshwater have been reviewed in the
RAR (ECB 2008). Based on this experimental evidence, a partition
coefficient for the distribution between solid particulate matter and
water (Kpsusp) of 5.04 (log value) has been defined for EU waters and
was used throughout the RAR..
The Kp for the distribution
between sediment and water (Kpsed) was estimated in the RAR
from that for particulate matter, as follows: Kpsed= Kpsusp/
1.5, based on the average difference in concentrations of zinc and other
metals in both media. For zinc this results in a Kpsed of 73,000
l/kg. (ECB 2008)
These partition coefficients have been used since then in other
legislative processes in the EU (e.g. the water framework directive) and
will also be used for REACH.
For the marine water, a partition coefficient water/suspended matter of
6010 l/kg has been derived.
For soil, a solids-water partitioning coefficient of 158.5 l/kg (log
value 2.2) was determined experimentally on 11 American soils. This
value was used in the RA Zinc.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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