Department of Biology, University of Utah, Salt Lake City, UT, 84112, USA.
Global Change and Sustainability Center, University of Utah, Salt Lake City, UT, 84112, USA.
Sci Rep. 2018 Feb 20;8(1):3334. doi: 10.1038/s41598-018-21359-0.
The oxygen (O/O) isotope analysis of hair is commonly applied to reconstruct an individual's residence history. However, region-of-origin as determined from oxygen isotope values (δO) alone is often spatially indistinct. Adding additional geochemical recorders can refine region-of-origin estimates. In this capacity, strontium (Sr/Sr) isotope analysis has attracted increased interest. While Sr/Sr reflects the influences of local geology, Sr/Sr of hair includes both external environmental signals as well as the internal dietary indicators. To better understand the impact of these contributions to the spatial signal encoded within Sr/Sr of hair, human hair was collected from three locations within Salt Lake City, Utah along with the donor's sex. The Sr/Sr and δO of hair and local tap water were measured. There were no significant relationships between sex and either δO or Sr/Sr of hair, nor between collection location and the δO of hair. However, we found significant associations between collection location and Sr/Sr of hair. These findings suggest that interactions with local water may be an important source of Sr to human hair and that the Sr/Sr of hair may have the capacity to record differences in Sr/Sr of tap waters on small spatial scales.
头发的氧（O/O）同位素分析通常用于重建个体的居住史。然而，仅通过氧同位素值（δO）确定的起源地在空间上往往不明显。添加其他地球化学示踪剂可以细化起源地的估计。在这种情况下，锶（Sr/Sr）同位素分析引起了越来越多的关注。虽然 Sr/Sr 反映了当地地质的影响，但头发中的 Sr/Sr 既包括外部环境信号，也包括内部饮食指标。为了更好地了解这些因素对头发中 Sr/Sr 空间信号的影响，我们从犹他州盐湖城的三个地点采集了人类头发，并测量了捐赠者的性别、头发和当地自来水的 Sr/Sr 和 δO。性别与头发的 δO 或 Sr/Sr 之间，以及采集地点与头发的 δO 之间均无显著相关性。然而，我们发现采集地点与头发的 Sr/Sr 之间存在显著关联。这些发现表明，与当地水的相互作用可能是 Sr 进入人体头发的重要来源，并且头发的 Sr/Sr 可能有能力在小的空间尺度上记录自来水 Sr/Sr 的差异。
