Talk:Copper

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Good articleCopper has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.
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DateProcessResult
October 2, 2006Good article nomineeListed
September 23, 2007Good article reassessmentDelisted
April 14, 2011Peer reviewReviewed
May 1, 2011Good article nomineeListed
Current status: Good article
Wikipedia Version 1.0 Editorial Team / v0.5 / Vital (Rated GA-class)
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Dietary Reference Intakes[edit]

I am creating the same format for DRIs for all essential vitamins and minerals. DRIs are a U.S. - based system that identifies Estimated Average Requirements (EARs), Recommended Dietary Allowances (RDAs), in some instances Adequate Intakes (AIs) if there is not enough information to establish EARs and RDAs, plus Tolerable Upper Intake Levels (ULs). Another major regulatory agency that has established ULs is the European Food Safety Authority (EFSA). ULs for both are provided, as they often differ. If there is a UL (for some vitamins none has been determined) then rationale may be covered in a Toxicity section. In addition to DRIs, the U.S. also established Daily Values, using this on food and dietary supplement labels as % DV. Most of the DVs were revised in May 2016. What I have written can be improved. It lacks RDA from EFSA or other major countries. It lacks an estimate of what percentages of people are deficient - although that is often covered in a separate section on deficiency and consequences of deficiency. I am creating this Subject in all of the Talk pages of the vitamin and mineral entries I have edited. Comments and improvements are welcome.David notMD (talk) 21:30, 20 July 2016 (UTC)

Changed section title to Dietary recommendations and added information on European Union system of recommendations.David notMD (talk) 12:00, 6 September 2017 (UTC)

Inconsistencies[edit]

Issue 1 - This article about Copper says gold and iron were used before copper. But the chemical timeline article says gold and iron weren't used until long after copper (6000 BC and 5000 BC for gold and iron, vs 8000 BC or 9000 BC for copper, depending on the source).

Issue 2 - This article about Copper says copper was the first metal that was smelt. But the Smelting article says lead was smelt before copper (6500 BC for lead vs 5500-5000 BC for copper).

I suspect this article about Copper is wrong on both counts. Although I'm not an expert, so I'll leave it to someone else to fix whichever article(s) is wrong. - 173.171.160.127 (talk) 04:13, 12 October 2017 (UTC)

Issue 3 - The chemical reaction in the Biological role section of this article is not correct. It does not even balance. — Preceding unsigned comment added by 155.98.114.144 (talk) 21:26, 1 March 2018 (UTC)

"it increased sixfold"[edit]

After your edit we still have a problem because the real ratio is 6.25, not 6. So how about:

  • "it increased by over 500%"

or even

  • "it increased by 525%"?

By the way: https://en.wiktionary.org/wiki/-fold
Vikom (talk) 03:43, 30 January 2018 (UTC)

This is precisely the problem: when you say something "increased sixfold", it is not clear if it means that it has increased to six times what it originally was (e.g. 100 to 600), or if it means that the increase was six times the original (e.g. 100 to 700, where the increase is 600). I am not sure why there is a need to give the ratio at all, but I think that "was multiplied by 6.25" is a much better way of expressing this without the risk of this kind of confusion. Double sharp (talk) 04:17, 30 January 2018 (UTC)
I have removed the ratio altogether, since I find it is not saying anything particularly useful that the actual costs don't already tell you (the wide range Cu prices have spread across). Double sharp (talk) 04:24, 30 January 2018 (UTC)
The whole point of this section is the volatility of prices over time, and in this case I favour simplicity over exactitude, so I suggest: "its price increased more than sixfold from the 60-year low", which emphasises the range. Cheers, Bahudhara (talk) 04:30, 30 January 2018 (UTC)
Once again, because of the potential ambiguity, if this is to be retained I would favour "its price increased to more than six nippled times what it was at the 60-year low" or similar. Double sharp (talk) 05:51, 30 January 2018 (UTC)

Fire diamond inaccuracy[edit]

According to a website, the fire diamond is a level one health hazard and a level one fire hazard.[1]

Semi-protected edit request on 7 November 2018[edit]

wazup 209.106.136.3 (talk) 17:53, 7 November 2018 (UTC) wazup

 Not done: --DannyS712 (talk) 18:04, 7 November 2018 (UTC)
  1. ^ "NFPA Label for all the elements in the Periodic Table". periodictable.com. Retrieved 2018-07-01.