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首页> 外文期刊>Journal of Archaeological Science >Stable isotope analyses of the carbonate component of bones and teeth: The need for method standardization
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Stable isotope analyses of the carbonate component of bones and teeth: The need for method standardization

机译：骨骼和牙齿碳酸酯组分的稳定同位素分析：方法标准化的需求

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摘要

In addition to the collagen and phosphate components of bones and teeth, the stable carbon and oxygen isotope compositions of skeletal carbonate are frequently measured to determine diet, environmental conditions, and populational or individual migration in bioarchaeological research. A standardized method for the stable isotopic analysis of skeletal carbonate has not yet been established, despite the importance of these data. In this study, significant differences in the stable oxygen isotope values of bones and dental enamel were observed, which arose due to instrument- and methodology-based differences. The same target archaeological samples were analyzed in three laboratories, and the stable isotope analyses were supplemented by Fourier Transformation Infrared Spectroscopy (FTIR) measurements, which detected a strong OH- concentration-dependence in the stable oxygen isotopic shifts measured between the three laboratories. Laboratory experiments were conducted to quantify the effects of reaction temperature and phosphoric acid (H3PO4) concentration on the oxygen isotopic composition of carbonate, both of which resulted in significant, though smaller delta O-18 changes than the OH-related delta O-18 change. As such, we suggest that the delta O-18 values of bone structural carbonate should not be included in anthropological interpretation and that the analysis of tooth enamel should be conducted at 70 degrees C using 102% H3PO4, in order to make the results comparable. Furthermore, carbonated hydroxylapatite (CHAP) reference materials with varied isotopic compositions should be developed in the near future.
机译：在生物考古学研究中，除了骨骼和牙齿的胶原蛋白和磷酸盐成分外，还经常测量骨骼碳酸盐的稳定碳和氧同位素组成，以确定饮食、环境条件以及种群或个体迁移。尽管这些数据很重要，但骨骼碳酸盐稳定同位素分析的标准化方法尚未建立。在这项研究中，观察到骨骼和牙釉质的稳定氧同位素值存在显著差异，这是由于基于仪器和方法的差异造成的。在三个实验室对同一目标考古样品进行了分析，稳定同位素分析得到了傅里叶变换红外光谱（FTIR）测量的补充，该测量在三个实验室之间测量的稳定氧同位素位移中发现了强烈的OH-浓度依赖性。进行了实验室实验，以量化反应温度和磷酸（H3PO4）浓度对碳酸盐氧同位素组成的影响，这两种影响都导致了显著的δO-18变化，尽管比OH相关的δO-18变化小。因此，我们建议，骨结构碳酸盐的δO-18值不应包括在人类学解释中，并且应在70℃下使用102%的H3PO4对牙釉质进行分析，以使结果具有可比性。此外，应在不久的将来开发具有不同同位素组成的碳酸羟基磷灰石（CHAP）标准物质。

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