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Correcting for Biogenic Gas Matrix Effects on Laser‐Based Pore Water‐Vapor Stable Isotope Measurements

Observed biases were gas matrix effects exclusively caused by biogenic headspace CO2. Observed biases exceeded 30× (δ2H) and 65× (δ18O) accepted measurement uncertainties. The proposed correction scheme uses data from repeated analyses of soil samples only. Post‐correction quality of isotope data matches accepted measurement uncertainties. The presented method helps to avoid grave misinterpretations of soil water isotope data.