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- W2020888960 abstract "Isotopic analysis of soil water requires complete extraction of water from the soil matrix to ensure against isotopic fractionation. A variant of the standard CO2–water equilibration technique avoids distillation of soil water that can cause isotopic fractionation. Reproducibility of direct equilibration is between 0.3‰ and 0.4‰. Longer equilibration times are necessary for soil with a fine particle size distribution and/or low water content than for standard CO2–water equilibrations. Differences in the δ18O value between unsterilized and sterilized (by γ-radiation) sample pairs suggests that respiration can contribute to changing the δ18O value of soil water. Measured δ18O values of samples prepared by adding water with a known δ18O value to dry soil increase with increasing water content and are always more negative than the δ18O value of the added water, especially at low water contents. The combination of contamination by residual water, heterogeneities due to difficulty with physical mixing of the sample, possible kinetic fractionations when small amounts of water are added to dry soil, contribute to these trends. These tests suggest that direct equilibration is a quick and relatively easy approach for measuring the δ18O value of soil water." @default.
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- W2020888960 title "Measurement of soil-water δ18O values by direct equilibration with CO2" @default.
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