G.G. Hatch Stable Isotope Laboratory

Shipping:
25 Templeton Street
Advanced Research Complex
Faculty of Science
University of Ottawa
Ottawa, ON Canada
K1N 6N5
Attn: P. Middlestead

Find us at:
25 Templeton Street
Advanced Research Complex (ARC)
Room 426

For all inquiries click here.

Paul Middlestead, Lab Manager
pmiddle@uottawa.ca
Tel: (613) 562-5800
ext. 6839 (office)
ext. 6836 (lab)

Dr. Ian Clark, Director

How to convert isotope data to Atom Percent (atm%)

AR = Absolute ratio of mole fractions:

ISOTOPE

STANDARD

ABSOLUTE RATIO (AR)

C 13

VPDB

0,0111803 **

N 15

AIR

0,0036764

D

VSMOW

0,0001557

O 18

VSMOW

0,0020051

Calculated after: Compilation of Minimum and Maximum Isotope Ratios of Selected Elements in Naturally Occurring Terrestrial Materials and Reagents, U.S. Geological Survey Water-Resources Investigations Report 01-4222 (Revised June 2002).

** New value from: Berglund, M. and Weiser, M. (2011) Isotopic Composition of the Elements 2009 (IUPAC Technical Report), Pure Appl. Chem., Vol. 83, No. 2, pp. 397–410

atm % =
100 * AR * (Delta/1000 + 1)
1 + AR * (Delta/1000 + 1)

Where AR is the Absolute Ratio (constant) and Delta is the value in permil to be converted into atm%.

 

© University of Ottawa
For additional information, consult our list of contacts
Technical questions? webmaster@uottawa.ca
Last updated: 2015.10.05