User talk:Redchasteen

Selenium

According to the wikipedia page on Selenium, it is not a metalloid. I also checked your reference to the urinary article which states selenium is a metalloid, I think that this is a typo, or a mistake. Please use another source for Selenium if you do think it is a metalloid.

Thanks for the consideration. Here are a few articles in the past that note that selenium is a metalloid. Please leave a talk message when you're convinced. There's no need for me to change the page again until you're converted:

Quote: “Selenium is a metalloid which is an essential micronutrient at low concentrations but becomes toxic at higher concentrations, with the range between being very narrow.”

Citation: David F. Lambert, Nicholas J. Turoczy; Comparison of digestion methods for the determination of selenium in fish tissue by cathodic stripping voltammetry; Analytica Chimica Acta 408 (2000) 97–102.

Quote: “The mobility and availability of the toxic metalloid selenium in the environment are largely controlled by sorption and redox reactions, which may proceed at temporal scales similar to that of subsurface water movement under saturated or unsaturated conditions.”

Citation: L. Charlet, A.C. Scheinost, C. Tournassat, J.M. Greneche, A. Géhin, A. Fernández-Martı´nez, S. Coudert, D. Tisserand, J. Brendle; Electron transfer at the mineral/water interface: Selenium reduction by ferrous iron sorbed on clay; Geochimica et Cosmochimica Acta, Volume 71; 2007; 5731-5749.

Quote: “The metalloid selenium is a required micronutrient in mammals needed for insertion into specific selenoproteins.”

Citation: Dennis Ganyc, William T. Self; High affinity selenium uptake in a keratinocyte model; FEBS Letters, Volume 582; 2008; 299-304.

Quote: “However, anodic stripping voltammetry (ASV), usually carried out with gold electrodes, is not so often applied to determination of Se because the stripping of this metalloid is accompanied by multiple peaks, which impair the reproducibility of the curves to be obtained.”

Citation: Claudete Fernandes Pereira, Fabiano Barbieri Gonzaga, Antonio Moraes Guarita-Santos, Jurandir Rodrigues SouzaDe, Determination of Se(IV) by anodic stripping voltammetry using gold electrodes made from recordable CDs, Talanta, Volume 69; 2006; 877-881.

Quote: “There is an increasing recognition that selenium is an important metalloid with industrial, environmental, biological and toxicological significance.”

Citation: F. Hellal, M. Dachraoui, Application of Doehlert matrix to the study of flow injection procedure for selenium (IV) determination, Talanta, Volume 63; 2004; 1089-1094.

Quote: “Selenium (Se) is a metalloid. It is essential for animals and humans.”

Citation: Lin Wu, Review of 15 years of research on ecotoxicology and remediation of land contaminated by agricultural drainage sediment rich in selenium, Ecotoxicology and Environmental Safety, Volume 57; 2004; 257-269.

Quote: “Selenium is a metalloid that in recent decades has gained international importance because of elevated residues found in fish and wildlife.”

Citation: Steven J. Hamilton, Rationale for a tissue-based selenium criterion for aquatic life, Aquatic Toxicology, Volume 57; 2002; 85-100.

Quote: “Urinary levels of another metalloid, selenium (Se), have recently been shown to be associated with increased As excretion and altered metabolite distribution.”

Citation: W. Jay Christian, Claudia Hopenhayn, Jose´ A. Centeno, Todor Todorov; Distribution of urinary selenium and arsenic among pregnant women exposed to arsenic in drinking water; Environmental Research 100 (2006) 115–122. Redchasteen (talk) 01:51, 18 April 2009 (UTC)[reply]

Metalloids article

The article Selenium clearly states in the first paragraph it is a non-metal. If you have reason to believe that Selenium is a metalloid, why don't you change this information in the Selenium article itself? The Selenium article is rated A-class on WikiProject Chemistry, but Metalloids is only C-class on WikiProject chemistry. I'm sure if you edit this on the Selenium article more attention will be added to this dispute. It is stated as a fact in the Selenium article that it is a non-metal. Also, if you clearly look at the staircase pattern formed by the Metalloids, Selenium does not fit into that pattern. Thank you Heights^{(Want to talk?)} 15:15, 23 April 2009 (UTC)[reply]

Also, if you look at Talk:Selenium, there has been the start of a dispute and according to various sources. Heights^{(Want to talk?)} 15:15, 23 April 2009 (UTC)[reply]

I'm editing there too. Thanks. Redchasteen (talk) 00:02, 28 April 2009 (UTC)[reply]