This page will serve as a landing place for things that I have found useful.
Calculating atom % from delta notation (per mil, or ‰):
atom % = (100 * AR * (delta/1000 + 1) / (1 + AR * (delta/1000 +1)
Absolute ratios (AR) are:
13-C (VPDB standard) : 0.0111796
15-N (AIR standard): 0.0036764
D (VSMOW standard): 0.0001557
18-O (VSMOW standard): 0.0020051
For an excellent brief primer on isotopic calculations, see the pdf below produced by John Hayes at Woods Hole Oceanographic Institute (WHOI):
atom % = (100 * AR * (delta/1000 + 1) / (1 + AR * (delta/1000 +1)
Absolute ratios (AR) are:
13-C (VPDB standard) : 0.0111796
15-N (AIR standard): 0.0036764
D (VSMOW standard): 0.0001557
18-O (VSMOW standard): 0.0020051
For an excellent brief primer on isotopic calculations, see the pdf below produced by John Hayes at Woods Hole Oceanographic Institute (WHOI):
hayes_whoi_isotopeintro.pdf | |
File Size: | 306 kb |
File Type: |