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Direct equilibration of soil water for δ18O analysis and its application to tracer studies

✍ Scribed by Ciara McConville; Robert M. Kalin; Deirdre Flood

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
98 KB
Volume
13
Category
Article
ISSN
0951-4198

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✦ Synopsis

Current methods for stable oxygen isotopic (d 18 O) analysis of soil water rely on separation of water from the soil matrix before analysis. These separation procedures are not only time consuming and require relatively large samples of soil, but also have been shown to introduce a large potential source of error. Current research at Queen's University Belfast is focused on using direct equilibration of CO 2 with the pore water to eliminate this extraction step using the automated Multiprep system and a Micromass Prism III isotope ratio mass spectrometer (IRMS). The findings of this research indicate the method is less time consuming, more reliable, and reproducible to within accepted limits (AE0.1%% d 18 O). In this study the direct equilibration method is used to analyse d 18 O tracer profiles in the unsaturated zone of field soils, concurrently with chloride tracer profiles, which can be used to assess infiltration rates and mechanisms through the unsaturated zone.

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