Method for determination of .sup.18 O/.sup.16 O and .sup.2 H/.su

Details Method for determination of .sup.18 O/.sup.16 O and .sup.2 H/.su Method for determination of .sup.18 O/.sup.16 O and .sup.2 H/.su

1997-12-19

1999-11-09

Larkin, Daniel S.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

73 6141, G01N 3700, G01N 3318

Patent

active

059792280

ABSTRACT:
A method for determination of .sup.18 O/.sup.16 O and .sup.2 H/.sup.1 H ratios and .sup.3 H concentrations of xylem and subsurface waters using time series sampling, insulating sampling chambers, and combined .sup.18 O/.sup.16 O, .sup.2 H/.sup.1 H and .sup.3 H concentration data on transpired water. The method involves collecting water samples transpired from living plants and correcting the measured isotopic compositions of oxygen (.sup.18 O/.sup.16 O) and hydrogen (.sup.2 H/.sup.1 H and/or .sup.3 H concentrations) to account for evaporative isotopic fractionation in the leafy material of the plant.

REFERENCES:
G. L. Stewart, et al., Tritium in Pine Trees From Selected Locations in the United States, Including Areas Nuclear Facilities, Geological Survey Research, U.S. Geol. Survey Prof. Paper, 800-B, pp. B265-B271 (1972).
R. L. Wershaw, et al., Hydrogen Isotopic Fractionation of Water Passing Through Trees, Advances in Organic Geochemistry, vol. 32, pp. 55-67 (1966).
R. Gonfiantini, et al, Oxygen Isotopic Composition of Water in Leaves, Laboratorio Di Geologia Nucleare, University of Pisa, Cnen, Italy.
G. Dongmann, et al., On the Enrichment of H.sub.2 .sup.18 O in the Leaves of Transpiring Plants, Rad. Environm. Biophys., 11, 41-52 (1974).
Tritium in the Physical and Biological Sciences II, Symposium, International Atomic Energy Agency, Vienna, selected pages, (1962).
Isotopic Variations in Meteoric Waters, Science, vol. 133, pp. 1702-1703 (May 26, 1961).

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