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GA Review

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Article (edit | visual edit | history) · Article talk (edit | history) · Watch

Reviewer: Pyrotec (talk · contribs) 13:35, 12 June 2012 (UTC)[reply]

I will review. Pyrotec (talk) 13:35, 12 June 2012 (UTC)[reply]

Initial comments

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I'm done an initial quick read of the article. On this basis, it looks a very strong contender for GA; and I would expect to be awarding GA at the end of this review. Having said that, I've not yet checked any of the references, so there may be some corrective actions - we will see. Pyrotec (talk) 15:53, 14 June 2012 (UTC)[reply]

I'm now reviewing the article against WP:WIAGA section by section, starting from Characteristics and then doing the WP:Lead last. Here I will be mostly highlighting "problems", so a section that is OK is likely to have few comments here. There will be an overall summary at the end of the review. Pyrotec (talk) 16:19, 14 June 2012 (UTC)[reply]

  • Characteristics -
    • Physical properties -
  • Appears compliant. I had a look at one of my old course books (Cotton & Wilkinson, 3rd ed, 1972) - Se8 made by evaporation of solutions below 72 C, stable gray form can be grown from hot solutions of Se in aniline or from melts: worth mentioning?
    • Isotopes & Occurrence -
  • These two subsections appear to be compliant.

Pyrotec (talk) 18:13, 15 June 2012 (UTC)[reply]

  • History -
  • checkY Pyrotec (talk) - Ref 21 (Trofast, Jan. Berzelius' Discovery of Selenium) has not been fully cited. The article comes from a journal, which has a publisher, journal title, volume & no., date of publication, pages and ISSN: none of these are given in the citation.
  • checkY Pyrotec (talk) - Ref 28 (The need for selenite and molybdate in the formation of formic dehydrogenase by members of the Coli-aerogenes group of bacteria. 57. 1954.) has not been fully cited. The article comes from a journal, which has a personal author, journal title, and page numbers: none of these are given in the citation.
  • Otherwise OK.
  • Production -
  • Appears compliant.
  • Chemical compounds -
    • Chalcogen compounds -
  • The text appears to contradict itself in respect of SeO3: i.e. "Selenium forms two stable oxides: selenium dioxide (SeO2) and selenium trioxide (SeO3). .... Unlike sulfur, which forms a stable trioxide, selenium trioxide is unstable and decomposes to the dioxide above 185 °C". I suspect that the problem lies in the wording of the "Unlike sulfur, ..." sentence.
     Done SO3 is stable, but SeO3 isn't. I've fixed it. Double sharp (talk) 15:47, 16 June 2012 (UTC)[reply]
  • There is no mention of how selenium trioxide is made (I looked it up and also when it was first prepared - 1930, by the way).
     Done Would that be enough? Double sharp (talk) 15:47, 16 June 2012 (UTC)[reply]
  • checkY Pyrotec (talk) - The equation: "3 Se + 4 HNO3 → 3 H2SeO3 + 4 NO" is balanced for Se and N but not H and O; there appears to be one molecule of water missing.
    • Halogen compounds -

...stopping for now. To be continued. Pyrotec (talk) 19:24, 15 June 2012 (UTC)[reply]

In passing, I've completed refs. 21 and 28 and the HNO3 reaction (water is also missing in the source book), though don't expect much from me on more time-consuming issues :-). Materialscientist (talk) 01:22, 16 June 2012 (UTC)[reply]
Thanks Materialscientist. Pyrotec (talk) 13:45, 16 June 2012 (UTC)[reply]
    • Selenides -
    • Other compounds -
    • Organoselenium compounds -
  • Looks OK.
  • Applications -
  • Ref 54 (^ Davis, Joseph R. (2001). %7C page 278 Copper and Copper Alloys. ISBN 978-0-87170-726-0.) is strangely cited. It's a book, but the publisher is not cited; the page number appears to be 278, but its not clear what the "%7C page 278" means.
     Done Double sharp (talk) 16:11, 16 June 2012 (UTC)[reply]
  • Refs 58, 59, 60 and 66 are books, but the publishers are not cited.
  • Biological role -

...stopping for now. To be continued. Pyrotec (talk) 15:08, 16 June 2012 (UTC)[reply]

  • I'm not sure I understand "2 GSH + H2O2----GSH-Px → GSSG + 2 H2O". The equation "2 GSH + H2O2 → GSSG + 2 H2O" seems to make more sense and its almost identical to the equation in Glutathione peroxidase.
  • Otherwise, OK.
  • Looks OK.

Pyrotec (talk) 08:27, 17 June 2012 (UTC)[reply]

Overall summary

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GA review – see WP:WIAGA for criteria

  1. Is it reasonably well written?
    A. Prose quality:
    B. MoS compliance for lead, layout, words to watch, fiction, and lists:
  2. Is it factually accurate and verifiable?
    A. References to sources:
    Well referenced.
    B. Citation of reliable sources where necessary:
    Well referenced.
    C. No original research:
  3. Is it broad in its coverage?
    A. Major aspects:
    B. Focused:
  4. Is it neutral?
    Fair representation without bias:
  5. Is it stable?
    No edit wars, etc:
  6. Does it contain images to illustrate the topic?
    A. Images are copyright tagged, and non-free images have fair use rationales:
    B. Images are provided where possible and appropriate, with suitable captions:
  7. Overall:
    Pass or Fail:

I'm awarding this article GA status. Having looked at other chemical/element articles, such as Oxygen which is now an FA, I suspect that Selenium could in due course become a strong candidate for WP:FAC. Congratulations on a fine article. Pyrotec (talk) 08:27, 17 June 2012 (UTC)[reply]