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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Direct equilibration of soil water for delta O-18 analysis and its application to tracer studies

McConville, C. and Kalin, R.M. and Flood, D. (1999) Direct equilibration of soil water for delta O-18 analysis and its application to tracer studies. Rapid Communications in Mass Spectrometry, 13 (13). pp. 1339-1345.

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Abstract

Current methods for stable oxygen isotopic (delta(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 CO2 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 (+/-0.1%parts per thousand delta(18)O). In this study the direct equilibration method is used to analyse delta(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. Copyright (C) 1999 John Wiley & Sons, Ltd.