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Talk:Calcium phosphate

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Vapor pressure

[edit]

What is the vapor pressure of Calcium phosphate? -- (Comment from 132.239.189.126)

That would be a fiendishly difficult thing to measure. I don't know whether anyone has done it. Usually salts like Calcium Phosphate have practically no vapor pressure. --Slashme 16:40, 18 December 2005 (UTC)[reply]

Please do not merge this page with Tricalcium phosphate. Calcium phosphate is the commonly used term for the family of compounds and does not automatically refer to tricalcium orthophosphate. This is the nomenclature used in the literature that actually deals with these compounds and, as such, I belive that this is in line with Wikipedia's "generally known as" policy. Nick

I'd like to propose that we Wikify back to calcium monohydrogen phosphate and that tricalcium phosphate becomes calcium orthophosphate (tribasic). I believe this would be closer to the IUPAC system. Does anyone have an argument for why the current system is better? Nick 20:11, 5 March 2006 (UTC)

Do NOT remove facts while claiming them to be "unsubstantiated" when those facts have been widely reported for years across all manner of science journals, legal court cases, admissions from tobacco companies themselves, television, newspapers, websites, and Wikipedia itself. Just because YOU don't know something doesn't make it 'unsubstantiated'.—The preceding unsigned comment was added by 86.34.234.247 (talk • contribs) .

http://en.wikipedia.org/wiki/Cigarette#Radioisotopes

The link above (http://en.wikipedia.org/wiki/Cigarette#Radioisotopes) suggests the main two elements involved are: lead-210 and polonium-210. Neither is present in pure calcium phosphate and it's a little disingenuous to suggest that they are without commentry on purity of fertilisers etc. Perhaps a rewording would be useful? MidgleyDJ 11:55, 21 July 2006 (UTC)[reply]

What is the reference for the 90% of lung cancers? It sounds dubious to me, but this is outside my sphere of knowledge. MidgleyDJ 22:18, 21 July 2006 (UTC)[reply]

If it's reported by all those sources, you should have no trouble citing one. If not, I'm going to remove the claim. —Keenan Pepper 22:45, 21 July 2006 (UTC)[reply]

Removed claim re: 90% of lung cancers. MidgleyDJ 05:25, 6 August 2006 (UTC)[reply]

This paper J Natl Cancer Inst. 1981 Jan;66(1):27-31. would suggest there isnt linkage between radioisotopes and smoking related lung cancer. Anyone else have any references? MidgleyDJ 08:15, 6 August 2006 (UTC)[reply]

This paper, Hecht SS (1999) Tobacco Smoke Carcinogens and Lung Cancer, Journal of the National Cancer Institute 91(14) 1194-1210. Says that there is not enough Polonium 210 in cigarette smoke to significantly impact lung cancer in smokers. MidgleyDJ 08:16, 6 August 2006 (UTC)[reply]

Do any of the papers mention calcium phosphate? I'm still confused about what calcium phosphate has to do with all this. —Keenan Pepper 09:16, 6 August 2006 (UTC)[reply]

Hi Keenan, I was too - I assume the fertiliser isnt pure CaHPO₄ and contains trace amounts of Lead and Polonium??

Perhaps this page should include a link to hydroxylapatite, since that is actually the mineral component of teeth. Haligonian1 (talk) 21:35, 2 July 2008 (UTC)[reply]

• Diphosphoric acid, calcium salt (1:2) [7790-76-3]
  • http://www.commonchemistry.org/ChemicalDetail.aspx?ref=7790-76-3

• Calcium hydroxide phosphate, (Ca5(OH)(PO4)3) [12167-74-7]. Please do not auto-direct this chemical to the one that the CAS number is not identical. My personal preference is to using CA index name. However, welcome to adopt another name that matches the international chemical naming system of IUPAC
  • http://www.commonchemistry.org/ChemicalDetail.aspx?ref=12167-74-7
  • http://www.commonchemistry.org/ChemicalDetail.aspx?ref=7758-87-4

--222.64.222.67 (talk) 08:52, 31 January 2010 (UTC)[reply]

• Phosphoric acid, calcium salt (1:1), dihydrate [7789-77-7]

--222.64.222.67 (talk) 08:59, 31 January 2010 (UTC)[reply]

• Phosphoric acid, calcium salt (1:1) [7757-93-9]
  • http://www.commonchemistry.org/ChemicalDetail.aspx?ref=7757-93-9

--222.64.222.67 (talk) 09:03, 31 January 2010 (UTC)[reply]

• Phosphoric acid, calcium salt (2:1) [7758-23-8]
  • http://www.commonchemistry.org/ChemicalDetail.aspx?ref=7758-23-8

--222.64.222.67 (talk) 09:08, 31 January 2010 (UTC)[reply]

Is it electrically conductive?

I propose that we convert this article to a disambiguation site, directing readers to the various phosphates of calcium. These are important materials and we should try to get this right. Suggestions welcome. --Smokefoot (talk) 11:56, 29 July 2014 (UTC)[reply]

It seems as though monocalcium (based upon the pictures) is 2 phosphate and one Ca++ ion, however, for dicalcium there is one of each, and then for tricalcium there are again 2 phosphates, but in this case there are 3, rather than 1, calcium ions. While this could be correct (yes, there is twice as much calcium per phosphate in di than mono calcium) this similarly seems like it could have been an error in the manufacturing of the images. I don't have time to research this right now as I have to get back to studying, but I thought it worth noting. — Preceding unsigned comment added by 71.184.112.126 (talk) 22:14, 24 February 2015 (UTC)[reply]

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There are many calcium phosphates, so it is awkard or maybe unrealistic to describe them in this article. --Smokefoot (talk) 14:48, 25 February 2017 (UTC)[reply]