Abstract
RationaleThe effects that alter the isotopic composition of water added to soil samples that have been oven‐dried previously are not fully understood.MethodsOven‐dried clay‐rich soil was repeatedly rewetted with two waters of strongly differing isotopic composition. This approach allowed the determination of the amount and the isotopic composition of soil‐bound water that exchanges with spike water after rewetting.ResultsAfter oven drying, 1.8% and 1.4% water (gravimetric content) exchanged with the added spike water, for δ2H and δ18O values, respectively. The isotopic composition of this soil residual water was depleted by 89.7 mUr and 5.42 mUr relative to the water extracted from field‐fresh soil for H and O, respectively. The cryogenic extraction method was more efficient than oven drying in terms of water removal from soil.ConclusionsOur results show that the isotopic difference between extractable (mobile) water and non‐extractable (soil‐bound) water explains the isotopic effects observed in spike water experiments. This difference, however, can also lead to a considerable isotopic offset between extractable and total soil water.
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