Talk:Cobalt

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Cobalt leading use is for batteries, not super-alloys[edit]

The linked reference [46] actually says in the article that the huge increase in cobalt is due to battery use, surpassing super-alloys - and this was written in 2006!

Quote: In recent years, rapid growth in the rechargeable battery industry resulted in a significant increase in the use of cobalt to make battery electrodes, such that on a global basis, the battery industry began to use more cobalt than the superalloy industry. Pware76 (talk) 15:15, 7 August 2017 (UTC)

The Leader[edit]

says "Cobalt-60 is a commercially important radioisotope, used as a radioactive tracer and for the production of high energy gamma rays."

My experience of the use of cobalt isotopes is that it is cobalt-57 which is used as a tracer in medical applications, not cobalt-60. In the 1970s and 1980s I designed instruments such as the 'Hydragamma-16' to measure traces of the Cobalt-57 used in radioimmunoassay for B12 measurements for example. Because of its shorter half-life, the specific activity of co57 is much higher than that of co60, and the relatively lower energies of the co57 spectrum also make it easier to measure the activity in vitro using small and thus relatively cheap and efficient well-type scintillation counters. See for example

http://www.med.harvard.edu/JPNM/physics/isotopes/Co/Co57/hist.html

http://www.amptek.com/wp-content/uploads/2013/12/cdte_5.png

https://www.aacc.org/community/divisions/history-of-clinical-chemistry/analyzer-listing/1984/hydragamma-16

Untitled[edit]

Article changed over to new Wikipedia:WikiProject Elements format by Dwmyers 16:31 Feb 20, 2003 (UTC). Elementbox converted 14:57, 2 July 2005 by Femto (previous revision was that of 00:39, 15 May 2005). 15 May 2005

Information Sources[edit]

Some of the text in this entry was rewritten from Los Alamos National Laboratory - Cobalt. Additional text was taken directly from USGS Cobalt Statistics and Information, from the Elements database 20001107 (via dict.org), Webster's Revised Unabridged Dictionary (1913) (via dict.org) and WordNet (r) 1.7 (via dict.org). Data for the table was obtained from the sources listed on the subject page and Wikipedia:WikiProject Elements but was reformatted and converted into SI units. —The preceding unsigned comment was added by Dwmyers (talkcontribs) 16:31, 20 February 2003 (UTC)

K.H.J. BUSCHOW (ed.), Handbook of magnetic materials, volume 12, 1999 Elsevier page 126 for the hcp->fcc transition. —The preceding unsigned comment was added by Marc Tobias Wenzel (talkcontribs) 17:01, 20 May 2003 (UTC)

Image of cobalt metal[edit]

Is the image of cobalt metal included in this article really cobalt? I looked online for more images of Cobalt metal and all the other pictures I have seen look much more silvery and much less golden.


Hey Guys

In medical uses of cobalt you should mention its use as an Implant material. Its used as for dental implants when alloyed with chromium and molybdenum, refered to as "CoCrMo" in scientific journals or "Vitalium" as a tradename

cheers

Chris


the cause of the cobalt blue color?[edit]

I am rather sceptical about the following assertion: " Cobalt blue (cobalt(II) aluminate, CoAl2O4) gives a distinctive deep blue color to glass, ceramics, inks, paints, and varnishes."

I am right now (2009-11-08) employed at the Blaafarveværket in Norway, and working on a display on cobalt.

The proces used for producing the blue pigment at the Blaafarveværket is well-described and cannot be doubted.

Cobalt oxide was smelted together with quartz and potassium carbonate. The result was an intensive blue glass-like substance that was grounded and sold to producers of glassware and porcelain.

The proces is described in Tone Sinding Steinsvik's book "Koboltgruvene og Blaafarveværket", ISBN 82-90734-20-4.

It can very well be that modern production methods favour cobalt aluminate, but obviously this hasn't always been the case. I feel very much tempted to edit this section, but will wait a couple of weeks in case someone with even more knowledge about this issue can put things in perspective.

Ron Werner (talk) 22:04, 8 November 2009 (UTC)

There seems to be two types of cobalt colouring materials: Smalt and Cobalt blue, while smalt [1] [2] is the silicate the cobalt blue of Tennard is the aluminate. For the painting mostly the Cobalt blue is used while for colouring glas mostly smalt is used. Has to be cleared out.--Stone (talk) 22:25, 8 November 2009 (UTC)
I added a little bit to make the whole thing clearer, but if you want and what ever you think is necessary.--Stone (talk) 11:52, 9 November 2009 (UTC)

In my opinion the Pigment and Coloring section needs updating. There are several varieties of cobalt blue (PB28, PB72, PB73, PB74), cerulean blue / coeruleum (PB36), as well as several hues of cobalt green (PG19, PG50), not to forget cobalt violet (PV14). http://handprint.com/HP/WCL/waterfs.html Harjasusi (talk) 16:30, 24 July 2015 (UTC)

Assessment comment[edit]

The comment(s) below were originally left at Talk:Cobalt/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

*Notable characteristics and Biological role both state that Mammals require small amounts of cobalt which is the basis of vitamin B12

Last edited at 15:27, 1 November 2008 (UTC). Substituted at 11:57, 29 April 2016 (UTC)

Patch Test?[edit]

There seems to be an image of a patch test down the bottom of the article that is not referenced in the body and does not appear to be relevant to Cobalt... — Preceding unsigned comment added by 103.38.149.55 (talk) 07:35, 28 November 2016 (UTC)

Probably because of the link to contact dermatitis, like Ni and Cr. But it's not linked to the text, so I've removed it. Double sharp (talk) 08:43, 28 November 2016 (UTC)

Cobalt reserves[edit]

The article lists world reserves at 1,700,000 metric tons, referenced to the USGS. However, the USGS reference actually lists the world reserves at 7,100,000 metric tons. Tjheld (talk) 13:32, 6 April 2017 (UTC)

You're right. I've corrected it. Double sharp (talk) 14:57, 6 April 2017 (UTC)