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EC number: 273-694-8
CAS number: 69011-50-3
A scum formed on the surface of molten zinc and zinc alloys.
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
IUCLID section 5.6.
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.
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