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this article needs additions to indicate why it is in Category: Methods and principles in archaeology Boris 18:55, 26 October 2006 (UTC)
It seems appropriate to have something about Hydrogen isotopes. They also indicate where the sources of water and other hydrogen compounds are, and create interesting difficulties in establishing the triple point of water. 97.113.67.185 ( talk) 18:36, 3 March 2010 (UTC)
E.g., it *implies* that a) 2 = 3; b) parts per thousand = per mil; c) amount = concentration; d) fractionation = discrimination; etc. Then, numerical values are taken from derivative references from particular applications rather than from the general sources. 69.9.28.58 ( talk) 19:08, 12 September 2010 (UTC)
You write: "13C/12C ratio in methane in the air. In geochemistry, paleoclimatology and paleoceanography this ratio is called δ13C." It is not. 13C/12C is not called delta13C ! And when it is correctly called something, it is in all areas of study, not only in the 3 cited ! Delete the article and wait for somebody to re-write it from scratch. 69.9.28.55 ( talk) 20:35, 25 January 2011 (UTC)
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