Difference between revisions of "Cadmium"

From Coastal Wiki
Jump to: navigation, search
Line 17: Line 17:
 
Like other heavy metals, cadmium does not have [[biomagnification|biomagnifying]] properties. Higher trophic levels accumulate low amounts of cadmium and are able to deal with them efficiently with [[metallothionein|metallothioneins]]. Mollusks contain large amounts of cadmium and seem to [[bioaccumulation|accumulate]] them.<ref>Clark, R,B., 1999. Marine pollution. Oxford University press, Fourth edition, pp 161</ref>
 
Like other heavy metals, cadmium does not have [[biomagnification|biomagnifying]] properties. Higher trophic levels accumulate low amounts of cadmium and are able to deal with them efficiently with [[metallothionein|metallothioneins]]. Mollusks contain large amounts of cadmium and seem to [[bioaccumulation|accumulate]] them.<ref>Clark, R,B., 1999. Marine pollution. Oxford University press, Fourth edition, pp 161</ref>
 
<P>
 
<P>
 
== Environmental standards and legislation ==
 
 
 
===Environmental standards===
 
<P>
 
<u>Water framework directive</u>
 
<P>
 
 
Annual average concentration in marine surface waters: '''0,2 µg/l'''
 
<P>
 
Maximum allowable concentration in marine surface waters: '''0,45 µg/l'''. However, allowable concentrations may rise up to 1,5 µg/l in areas with a lot of dissolved CaCO<sub>3</sub>.
 
<P>
 
 
<u>OSPAR convention</u>
 
 
Ecotoxicological assessment criteria
 
 
===legislation===
 
 
[[OSPAR List of priority substances]]
 
 
[http://www.ospar.org/documents%5Cdbase%5Cpublications%5Cp00151_Background%20document%20on%20Cadmium.pdf OSPAR background document on Cadmium]
 
 
[[List of priority substances|Water framework list of priority substances]]
 
 
  
  
Line 56: Line 30:
  
 
[[Heavy metals in various Belgian benthic invertebrates]]
 
[[Heavy metals in various Belgian benthic invertebrates]]
 +
 +
 +
== Environmental standards and legislation ==
 +
 +
[[OSPAR List of priority substances]]
 +
 +
 +
[[List of priority substances|Water framework list of priority substances]]
  
  
Line 61: Line 43:
  
 
[http://www.vliz.be/projects/endis/EDnorth.php?showchemprop=true&showeffects=true&chemeffects=true&chemid=323 Cadmium on the ED North Database]  
 
[http://www.vliz.be/projects/endis/EDnorth.php?showchemprop=true&showeffects=true&chemeffects=true&chemid=323 Cadmium on the ED North Database]  
 +
 +
[http://www.ospar.org/documents%5Cdbase%5Cpublications%5Cp00151_Background%20document%20on%20Cadmium.pdf OSPAR background document on Cadmium]
  
  
 
==References==
 
==References==
 
<references/>
 
<references/>

Revision as of 14:18, 30 July 2009

Definition of cadmium:
Cadmium is a heavy metal with symbol Cd and atomic number 48 [1]
This is the common definition for cadmium, other definitions can be discussed in the article

Notes

Cadmium © Greg Robson

The main anthropogenic sources are copper and zinc smelting, batteries and fuel combustion. It mostly enters the marine ecosystem through atmospheric loading and riverine discharges.[2]

Cadmium is regarded as one of the most toxic metals. It causes sublethal and behavioral effects at lower concentrations than mercury and lead. It causes cancer in animals, and in vertebrates it causes kidney toxicity. [3] In humans it might also lead to skeletal deficiencies and lung damage. [4] Environmental concentrations of 5µg/l have affected the reproduction of copepods, decreased the abundance of isopods and depressed the growth of juvenile plaice. Laboratory LC50 (the concentration at which 50% of the test subjects die) toxic levels for copepods were higher than 0,34mg/l. [2]

Like other heavy metals, cadmium does not have biomagnifying properties. Higher trophic levels accumulate low amounts of cadmium and are able to deal with them efficiently with metallothioneins. Mollusks contain large amounts of cadmium and seem to accumulate them.[5]

Case studies

PCB and heavy metals in beached sperm whales

Heavy metal content of mussels in the Western Scheldt estuary

Common starfish can act as a bioindicator for heavy metal pollution

Effects of heavy metals on the sperm quality and the larvae survival of sea urchins

Heavy metals in various Belgian benthic invertebrates

Environmental standards and legislation

OSPAR List of priority substances


Water framework list of priority substances


See also

Cadmium on the ED North Database

OSPAR background document on Cadmium


References

  1. http://en.wikipedia.org/wiki/Cadmium
  2. 2.0 2.1 Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp
  3. Biology of marine birds. Schreiber, E.A. & Burger, J. (Eds). 2002. Boca Raton, Florida: CRC Press. 722 pp.
  4. eds.J. Vos, G. Bossart, M. Fournier, and T. O'Shea, 2004; New perspectives: Toxicology and the environment. Toxicology of marine mammals, New York: Taylor & Francis. 643p
  5. Clark, R,B., 1999. Marine pollution. Oxford University press, Fourth edition, pp 161