Elemental composition of the body

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    Body Composition
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Discussion Overview

The discussion revolves around the elemental composition of the human body, specifically focusing on the percentage of hydrogen and the implications of including various isotopes of hydrogen, such as deuterium and tritium. Participants explore the nuances of isotopic distribution and its relevance to body composition.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether the 10% body mass attributed to hydrogen refers solely to the most common isotope, 1H, or if it also includes other isotopes like deuterium and tritium.
  • Another participant asserts that the percentage includes all isotopes of hydrogen and reflects the isotopic distribution based on ingestion, while expressing uncertainty about the presence of tritium, suggesting it should be in very low concentrations.
  • Some participants note that isotopic distribution is not always identical and reference the variability in atomic masses of elements depending on the source, indicating a complexity in the discussion of elemental composition.

Areas of Agreement / Disagreement

Participants express differing views on the isotopic distribution of hydrogen in the body, with some agreeing that all isotopes are included while others raise concerns about the variability and implications of this distribution. The discussion remains unresolved regarding the specifics of tritium's presence and its significance.

Contextual Notes

Limitations include the lack of clarity on the exact isotopic contributions to body mass and the dependence on dietary intake, as well as the unresolved nature of how different sources may report atomic masses.

Lisa!
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So when it says that 10% of the body mass consists of Hydrogen, does it mean only 1H(single proton) or it also includes other natural isotopes of hydrogen (deuterium and tritium ) ? I know that 1H is the most common hydrogen isotope with an abundance of more than 99.98%, but I just wanted to know exaactly what it means.

http://en.wikipedia.org/wiki/Composition_of_the_human_body

Thanks:smile:
 
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That includes all of the isotopes of hydrogen. It will reflect the isotopic distribution of everything you ingest. I'm not too sure about tritium though. I would hope that particular isotope is present in extremely low concentrations.
 
chemisttree said:
That includes all of the isotopes of hydrogen. It will reflect the isotopic distribution of everything you ingest. I'm not too sure about tritium though. I would hope that particular isotope is present in extremely low concentrations.


Thank you!:smile:
 
To muddy water - isotopic distribution is not always identical.

See for example http://www.nationalpost.com/news/Periodic+table+weighty+revamp/3978117/story.html .

Not that it is something new, fact that atomic masses of elements are different depending on the source is known for many years.
 
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Borek said:
To muddy water - isotopic distribution is not always identical.

See for example http://www.nationalpost.com/news/Periodic+table+weighty+revamp/3978117/story.html .

Not that it is something new, fact that atomic masses of elements are different depending on the source is known for many years.

hmmm...That's interesting!Thank you:smile:
Thanks God that I'm not at school anymore:biggrin:
 
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Lisa! said:
hmmm...That's interesting!Thank you:smile:
Thanks God that I'm not at school anymore:biggrin:


And http://pubs.acs.org/stoken/presspac/presspac/full/10.1021/jf1003539" too!
 
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