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首页> 美国政府科技报告 >Temporal and Spatial Patterns of Water Isotope Ratios (Delta2H and Delta18O) in Municipal Tap Water as Measured by TCEA-IRMS.
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Temporal and Spatial Patterns of Water Isotope Ratios (Delta2H and Delta18O) in Municipal Tap Water as Measured by TCEA-IRMS.

机译：用TCEa-IRms测定市政自来水中水同位素比值（Delta2H和Delta18O）的时空格局。

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An understanding of fine resolution variability in water stable isotope ratios is needed to ascertain the utility of water stable isotope ratios for observational purposes and sensor applications. While others have demonstrated that intra-annual ranges of tap water isotope ratios are relatively small (approximately 10% difference) and large geographic distances yield large variation in tap water isotope ratios (Bowen et al. 2007; Kennedy et al. 2011) further assessment of short term variability and fine geographic resolution is required. Here we present a laboratory assessment of the spatial and temporal variability in water stable isotope ratios (Delta2H and Delta18O) Samples were collected from 12 locations within a single office building over the course of three months to determine patterns in daily, long-term and spatial variation. Samples were analyzed by quantitative high temperature conversion elemental analysis (TC/EA), chromatographic separation and stable isotope ratio analysis. The study revealed minimal daily variation and covariance in (Delta2H and Delta18O) Covariance in (Delta2H and Delta18O) has been demonstrated by others (Bowen et al. 2007). Evidence of seasonal variation was observed and was expected based on previous reports (Kennedy et al. 2011). Specifically, both (Delta2H and Delta18O) demonstrated an observable shift towards isotopic enrichment as the sampling period transitioned from spring to summer. This investigation reveals that with consideration of predictable seasonal patterns in 2H and 18O these analyses, and relative to global geospatial variations (Povinec et al., 2011), the methods used here provide a robust indicator of water sources.

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