Methods for correcting hydrogen and oxygen isotopes in soil water for low-temperature vacuum extraction systems

Abstract

This invention provides a method for correcting hydrogen and oxygen isotopes in soil water using a low-temperature vacuum extraction system, belonging to the field of isotope hydrological data processing. The method includes acquiring clay content and water content, as well as measuring hydrogen and oxygen isotope values ​​of soil water through low-temperature vacuum extraction. The clay content and water content are input into a hydrogen isotope correction model to obtain hydrogen isotope bias values; similarly, the clay content and water content are input into an oxygen isotope correction model to obtain oxygen isotope bias values. The hydrogen and oxygen isotope correction models are pre-determined using known soil water hydrogen and oxygen isotope biases, as well as soil clay content and water content, through multiple linear regression. The hydrogen and oxygen isotope measurements are corrected using the hydrogen and oxygen isotope bias values ​​to obtain the corrected hydrogen and oxygen isotope contents. This method improves the accuracy of stable hydrogen and oxygen isotope content in soil water.

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