From Wikipedia, the free encyclopedia
Ion
Chemical compound
The selenate ion is SeO2− 4 .
[1]
Selenates are analogous to
sulfates and have similar chemistry. They are highly soluble in
aqueous solutions at ambient temperatures.
[2]
Unlike sulfate, selenate is a somewhat good
oxidizer ; it can be reduced to
selenite or
selenium .
[3]
In strongly acidic conditions, the hydrogen selenate ion, HSeO− 4 , is formed.
[4] It corresponds to the
selenic acid , H2 SeO4 , which is a strong acid and can in its concentrated form dissolve
gold .
[5]
The element selenium exhibits several valence states. Selenate is the least reduced, followed by selenite, and elemental selenium;
selenide is even more reduced than elemental selenium.
[6] The
valence state is an important factor to the
toxicity of selenium. Selenate is the form required by organisms that need selenium as a
micronutrient . These organisms have the ability to acquire, metabolize and excrete selenium.
[7] The level at which selenium becomes toxic varies from species to species and is related to other environmental factors like
pH and
alkalinity that influence the concentration of selenite over selenate.
[8]
Selenate and other forms of selenium are highest in areas where ancient seas have evaporated. These areas are enriched in selenium and over millennia, biologic adaptation has occurred.
[9]
References
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^ Jegadeesan, G.; Mondal, K.; Lalvani, S. B. (May 11, 2010).
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doi :
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ISSN
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"11.2 - Arsenic and Selenium" , Treatise on Geochemistry (Second Edition) , Oxford: Elsevier, pp. 13–57,
ISBN
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^ Mangiapane, Erika; Pessione, Alessandro; Pessione, Enrica (2014).
"Selenium and selenoproteins: an overview on different biological systems" . Current Protein & Peptide Science . 15 (6): 598–607.
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^ Tan, Lea Chua; Nancharaiah, Yarlagadda V.; van Hullebusch, Eric D.; Lens, Piet N. L. (2016).
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ISSN
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PMID
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^ Xie, Lingtian; Wu, Xing; Chen, Hongxing; Dong, Wu; Cazan, Alfy Morales; Klerks, Paul L. (2016).
"A low level of dietary selenium has both beneficial and toxic effects and is protective against Cd-toxicity in the least killifish Heterandria formosa" . Chemosphere . 161 : 358–364.
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^ Domokos-Szabolcsy, Éva; Fári, Miklós; Márton, László; Czakó, Mihály; Veres, Szilvia; Elhawat, Nevien; Antal, Gabriella; El-Ramady, Hassan; Zsíros, Ottó; Garab, Győző; Alshaal, Tarek (2018-09-08).
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Se(−II) Se(0,I) Se(I) Se(II) Se(IV) Se(VI) Se(IV,VI)
Salts and covalent derivatives of the
selenate ion