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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.
Kp for solid particulate matter and water (Kpsusp): 110000 l/kg (log value: 5.04) (ECB 2008)Kp for water and sediment (Kpsed); 73000l/kg ( log value:4.86) (ECB 2008)Kd for marine waters is 6010 l/kg (log value: 3.78)Kd for solids-water in soil is 158.5 l/kg (log value: 2.2)
For metals, adsorption/desorption translates in the distribution of the
metals between the different fractions of the environmental compartment,
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,...).This distribution between the different
compartments is translated in the partition coefficients between these
different fractions. Study records on partition coeficients are given
under IUCLID section 5.6.
Partition coefficients for zinc in freshwater has been reviewed in the
RAR (ECB 2008). Based on the extensive 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 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 Kpsedof 73,000
l/kg. (ECB 2008)
The marine Kd was derived based
on data from several marine waters. the geomean value for zinc in
seawater is 6010 l/kg
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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