Beware of effects on isotopes of dissolved oxygen during storage of natural iron-rich water samples: A technical note.

Beware of effects on isotopes of dissolved oxygen during storage of natural iron-rich water samples: A technical note.
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注意天然富铁水样储存过程中对溶解氧同位素的影响:技术说明

DOI:
10.1002/rcm.9024
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发表时间:
2020
期刊:
Rapid communications in mass spectrometry : RCM
影响因子:
--
通讯作者:
Martinez
Martinez
中科院分区:
--
文献类型:
--
作者:
Köhler;Piatka;Martinez

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基本原理溶解氧同位素比 (δ18ODO) 的研究提供了有关水生系统中氧循环的宝贵信息。然而,Fe(II) 的氧化可能会在储存过程中改变原始 δ18ODO 值,并可能导致误解。我们对富含 Fe(II) 的泉水系统进行了采样,并在不同时间间隔测量了 δ18ODO 值,以确定 Fe 氧化的影响。方法从富含 Fe(II) 的泉水和相关溪流中采集水样,并使用同位素比质谱仪测量 4 天和 13 天的新鲜样品中的 δ18ODO 值。每个样品重复测量 3 次,1σ 为 ± 0.2‰。还通过多参数探针和分光光度法测量了泉水系统过程中的现场参数和 Fe(II) 含量。结果新鲜、4 天和 13 天的样品中泉水系统过程中的 δ18ODO 值显示出高达 8% 的差异。我们通过 Fe(II) 氧化消耗 DO 来解释这种增加。流长达到 85 米后,新鲜样品和旧样品之间的 δ18ODO 值差异减小,因为大部分 Fe(II) 被消耗。结论 如果在储存时间过长后测量富含铁的水样,则可能会错误地解释 δ18ODO 值,我们建议在采样后立即测量。
RationaleInvestigations of the isotope ratios of dissolved oxygen (δ18ODO) provide valuable information about the oxygen cycle in aquatic systems. However, oxidation of Fe(II) may change pristine δ18ODOvalues during storage and can lead to a misinterpretation. We sampled an Fe(II)‐rich spring system and measured δ18ODOvalues at various time intervals in order to determine influences of Fe‐oxidation.MethodsWater samples were collected from an Fe‐rich spring and related stream and the δ18ODOvalues were measured in fresh, 4‐ and 13‐day‐old samples with an isotope ratio mass spectrometer. Three replicates were measured for each sample with a 1σ of ± 0.2‰. On‐site parameters and Fe(II) contents were also measured over the course of the spring system by multi‐parameter probes and spectrophotometry.ResultsThe δ18ODOvalues over the course of the spring system in fresh, 4‐ and 13‐day‐old samples revealed differences of up to 8‰. We explain this increase by the consumption of DO by Fe(II)‐oxidation. After a flow length of 85 m the differences in δ18ODOvalues between fresh and older samples decreased because most of the Fe(II) was consumed.ConclusionsFalse interpretations of δ18ODOvalues are possible if Fe‐rich water samples are measured after too long storage, and we recommend measurement immediately after sampling.
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