Effects of cryogenic vacuum distillation on the stable isotope ratios of soil water

IF 0.6 Q4 WATER RESOURCES Hydrological Research Letters Pub Date : 2019-01-01 DOI:10.3178/HRL.13.1
K. Tsuruta, Hiroyuki Yamamoto, M. Katsuyama, Y. Kosugi, M. Okumura, N. Matsuo
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引用次数: 14

Abstract

: Cryogenic vacuum distillation (CVD) methods have been widely used to extract water from unsaturated soil materials. However, recent studies have reported that extraction conditions (e.g. extraction time) and soil type can influence the stable isotope ratios of soil water extracted by CVD. We examined (i) the effects of extraction time on the stable isotope ratios of soil water extracted by CVD, and (ii) how the stable isotope ratios differed from those of soil water extracted by other methods. We first examined extraction times of 1–6 h, and observed no significant differences in the δ 2 H or δ 18 O values of extracted soil water for extraction times >2 h. However, extraction for 1 h collected only 48% of soil water, and the δ 2 H and δ 18 O values were significantly lower than those for extraction times >2 h. We then compared the stable isotope ratios of soil water extracted by CVD and centrifugation. Although the stable isotope ratios for both extraction methods were within the range of that of rainwater, the stable isotope ratios for water extracted by CVD were lower than those for water extracted by centrifugation. Our results highlight questions surrounding the use of CVD for stable isotope analysis of soil water.
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低温真空蒸馏对土壤水分稳定同位素比值的影响
低温真空蒸馏法(CVD)已广泛应用于非饱和土材料的水分提取。然而,最近的研究报道,提取条件(如提取时间)和土壤类型会影响CVD提取的土壤水的稳定同位素比率。我们研究了(i)提取时间对CVD提取的土壤水稳定同位素比率的影响,以及(ii)稳定同位素比率与其他方法提取的土壤水的差异。我们首先考察了1 ~ 6 h的提取时间,发现提取时间> ~ 2 h下提取的土壤水δ 2 h和δ 18 O值没有显著差异,但提取时间1 h只收集了48%的土壤水,δ 2 h和δ 18 O值显著低于提取时间> ~ 2 h下提取的土壤水。虽然两种提取方法的稳定同位素比值都在雨水的稳定同位素比值范围内,但CVD提取的水的稳定同位素比值低于离心提取的水。我们的结果突出了围绕使用CVD进行土壤水稳定同位素分析的问题。
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来源期刊
CiteScore
1.90
自引率
18.20%
发文量
9
审稿时长
10 weeks
期刊介绍: Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.
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