Difference between revisions of "Zinc"
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Revision as of 09:58, 31 July 2009
Contents
Definition of zinc:
Zinc is a heavy metal with the symbol Zn and atomic number 30. [1] It is brittle and has a bluish-white color. It becomes coated with a corrosion-resistant layer in moist air.[2]
This is the common definition for zinc, other definitions can be discussed in the article
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Notes
Zinc concentrations are much higher in highly polluted industrialized coastal areas, like the North Sea (up to 70µg/l), than in the open ocean (0,1µg/l).[3]. Zinc usually enters the marine environment through effluents from smelters and mining sites.
Zinc tends to be accumulated by bivalves. Especially oysters contain large amounts of zinc, in the highly contaminated English Restronguet Creek they contain zinc concentrations above 10.000 µg/g dry weight. However, like most heavy metals zinc doesn't tend to biomagnify, so that it causes little harm to sea birds or marine mammals. [3]
Case studies
The relation between pollutants and disease in guillemotsHeavy metal content of mussels in the Western Scheldt estuary
Common starfish can act as a bioindicator for heavy metal pollution
Heavy metals in various Belgian benthic invertebrates
See also
References
- ↑ http://en.wikipedia.org/wiki/Zinc
- ↑ http://glossary.eea.europa.eu/terminology/concept_html?term=zinc
- ↑ 3.0 3.1 Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp
