Effects of Long‐Term Storage on the Isotopic Compositions of Different Types of Environmental Waters

Rapid Communications in Mass Spectrometry, Journal Year: 2025, Volume and Issue: 39(8)

Published: Jan. 10, 2025

ABSTRACT Rationale Fog, dew, and rain are crucial for sustaining ecosystem functions, especially in water‐limited regions. However, they subject to isotopic changes during storage due their usual small sample volumes inherent sensitivity atmospheric particulates. Understanding long‐term effects on these water samples is essential ensuring integrity. Methods In this study, the extent of such compositions (δ 2 H, δ 18 O, 17 O) fog, was investigated under different times (4.5–9 years) bottle fill levels (4.8%–92.4%) using Los Gatos Research Inc. GLA431 series analyzer. Results The could lead a large variation oxygen isotopes fog with minor dew samples. O waters were negatively correlated level ( p < 0.01) but positively related time 0.01). Chemical reactions between solutes molecules within may induce fractionation, leading high storage. No significant H values observed three types. Conclusions Our findings help understand accuracy precision rainwaters by providing information after

Language: Английский

δ²H isotopic offsets in xylem water measurements under cryogenic vacuum distillation: Quantifying and correcting wood‐water hydrogen exchange influences

Ecohydrology, Journal Year: 2024, Volume and Issue: 17(3)

Published: March 16, 2024

Abstract Stable isotopes δ 18 O and 2 H are used to infer vegetation water sources. In some studies, significant xylem offsets from potential source waters have been observed. The appear be more prevalent with cryogenic vacuum distillation (CVD) of plant water. Hypothesized mechanisms for these include changes during uptake transport, methodological problems. We propose that a large portion the due hydrogen isotope exchange between non‐crystalline hydroxyl groups wood cellulose hemicellulose CVD. present method estimating hypothesized isotopic tissues water, which is result Rayleigh equilibrium fractionation. To estimate exchange, we use published properties North American tree species chemical relationships as function moisture content, CVD temperature extraction efficiency. A simple model captures range observations in studies non‐CVD methods were compared. evaluate model, compared observed (sw‐excess) values two field datasets (90°C, n = 364, 170°C, 43) estimated our model. found good agreement samples extracted at 90°C ( r 0.69) but not 170°C 0.20). offset may eliminated by increasing 229°C or adding standard sufficient raise content >150%. correction can also approximated applying theoretical calculation based on temperature,

Language: Английский