Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 244-168-5
CAS number: 21041-95-2
Waived: Inorganic substance:
According to Annex IX of REACH Regulation, information on hydrolysis is
not required for inorganics.
Also the other endpoints under
5.1. e.g; phototransformation in air, water and soil, are not applicable
to Cadmium metal
Biodegradation is not applicable
to metals/inorganic substances. Tests are not to be conducted if the
substance is inorganic (Annex VII of REACH regulation)
BCF's for cadmium are highest in
algae and lowest in fish; High BCF in algae does not necessarily reflect
high bioconcentration, because a significant part of the Cd is absorbed
to the outer side of the organisms, and not taken up. Another factor of
error is the lack of gut clearance in invertebrates. Organs (kidney,
liver) contain most Cd.
Main influencing factors for Cd
BCF are hardness and Cd concentration in the water. Increasing water
hardness reduces Cd uptake. BCF is also inversely related to Cd
concentration in water.
McGeer et al (2003) recently
extensively the reviewed evidence on bioconcentration and
bioaccumulation of cadmium as a function of exposure concentration in a
number of taxonomic groups (algae, molluscs, arthropods, annelids,
salmonid fish, cyprinid fish, and other fish). The data clearly
illustrated that there is a significant degree of control on internal
cadmium content. In general, BCF data showed an inverse relationship to
exposure concentrations. In all cases, the relationship of BCF to
exposure was significant and negative. The slopes of the BCF/BAF –
exposure relations were: algae: -0.72, insects: -0.32, arthropods:
-0.61, molluscs: -0.50, salmonids: -0.87, Centrarchids: -0.47,
Killifish: -0.05, other fish: -0.72. Overall, species mean slope was
-0.49 +/- 0.04 (McGeer et al 2003. Environm. Toxicology & Chemistry, vol
22, nr 5, 1017 -1037).
EU Risk assessment (ECB 2008) presents BAF values that were calculated
from the soil:biota concentration ratio’s. Most organisms are earthworms
and the Cd levels were expressed on dry or wet weight basis. All the
data on earthworms were obtained from specimens with guts voided prior
Cadmium is concentrated from
the soil into earthworms organisms (BAF values are all higher than 1).
Most important factors affecting the bioaccumulation of Cd by earthworms
are the Cd concentration of the soil, soil type, pH, soil organic matter
influence of the Cd content of the soil on the bioaccumulation of Cd is
illustrated in most of the studies. Cadmium concentrations in earthworms
increase with increasing Cd levels in a non-proportional way. As a
result, the BAF observed in Cd-contaminated or Cd-enriched soils is
lower than the BAF observed in control soils.
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. The information on these
partition coefficients is given under 5.6.
Partition coefficients for cadmium
in freshwater have been reviewed in the EU risk assessment report (ECB
2008). Based on this experimental evidence, a partition coefficient for
the distribution between solid particulate matter and water (Kpsusp) of
130 x 103l/kg has been defined for EU waters and was used
throughout the RAR..
Kp for the distribution between sediment and water (Kpsed)
was estimated in the RAR from the ratio of the average sediment
(1.32mg/kgDW)to average water Cd concentrations (0.14µg/l). This "best
fit" Kd yields 10000L/kgDW (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 617 l/kg has been derived.
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.
Niniejsza strona używa plików cookies, aby zapewnić optymalne korzystanie z naszych stron internetowych.
Welcome to the ECHA website. This site is not fully supported in Internet Explorer 7 (and earlier versions). Please upgrade your Internet Explorer to a newer version.
Do not show this message again