研究样品干燥对 Itrax XRF 核心扫描仪信号再现性的影响

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2024-02-20 DOI:10.1111/iar.12517
Naveed Hassan, Ludvig Löwemark, Alice Chien-Yi Liao
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引用次数: 0

摘要

沉积物样本在储存过程中容易变干,因此用塑料薄膜包裹后冷藏储存,温度约为 4°C。然而,在 XRF 岩心扫描过程中,必须将样品从覆盖物中取出,这就增加了表面干燥和形成干燥裂缝的风险。由于扫描时间通常长达数小时,最高分辨率的扫描可能需要一天以上才能完成,因此岩芯会在扫描过程中逐渐变干。通过这项研究,我们希望进一步了解样品在扫描和储存过程中的缓慢干燥是如何影响 XRF 信号的,这是因为含水量、沉积物表面地形发生了变化,沉积物岩芯中出现了细小但缓慢扩展的裂缝。结果表明,样品在扫描和储存过程中的干燥会在多个方面影响 XRF 测量结果。最重要的是,岩心的缓慢干燥会导致样品表面普遍降低,以及岩心收缩变短。沉积物表面与检测器之间的距离增大会导致噪声水平升高,许多元素的重现性变差,而岩心的收缩可能会在运行之间移动个别数据点,导致重现性变差,不同时间获得的数据集之间也会出现偏差。此外,轻元素(如氢和氧)的损失会影响基质效应,尤其是富含有机质的沉积物。由于单个元素的 XRF 信号会受到不同程度的影响,这些变化可能会导致许多常用于古环境重建的元素比率出现人为偏移和偏差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigating the impact of sample desiccation on Itrax XRF core scanner signal reproducibility

Sediment samples tend to dry out during storage and are, therefore, stored refrigerated at about 4°C after wrapping in plastic foil. During XRF core scanning however, the samples must be taken out of their cover, increasing the risk of drying and formation of desiccation cracks on the surface. Because scan times can often amount to several hours and at highest resolution may take over a day to complete, the core will progressively dry out during scanning. With this study we aim to increase our understanding of how this slow drying of the samples during scanning and storage influences the XRF signal because of changes in water content, sediment surface topography, and the development of small, but slowly expanding cracks in the sediment core. Results show that the desiccation of samples during scanning and storage influence the XRF measurements in several ways. Most importantly, slow desiccation of the cores results in both a general lowering of the sample surface, and a shortening of the core due to shrinkage. Larger distance between sediment surface and detector leads to increased noise levels and poor reproducibility for many elements, while the shrinking of cores may shift individual data points between runs, resulting in poor reproducibility and offsets between datasets obtained at different times. Moreover, the loss of light elements, such as hydrogen and oxygen, can influence the matrix effect, especially for organic-rich sediment. Because the XRF signals of individual elements are affected to different degrees, these changes may induce artificial shifts and biases in many elemental ratios commonly used for paleoenvironmental reconstruction.

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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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