Pub Date : 2021-01-01Epub Date: 2021-02-09DOI: 10.5194/ejm-33-77-2021
Ruggero Vigliaturo, Sabrina M Elkassas, Giancarlo Della Ventura, Günther J Redhammer, Francisco Ruiz-Zepeda, Michael J O'Shea, Goran Dražić, Reto Gieré
In this paper, we present the results of a multi-analytical characterization of a glaucophane sample collected in the Piedmont region of northwestern Italy. Investigation methods included optical microscopy, powder X-ray diffraction, Fourier-transform infrared spectroscopy, μ-Raman spectroscopy, Mössbauer spectroscopy, electron probe microanalysis, environmental scanning electron microscopy and energy-dispersive X-ray spectroscopy, and scanning/transmission electron microscopy combined with energy-dispersive X-ray spectroscopy and electron energy-loss spectroscopy. In addition to the crystal-chemical characterization of the sample from the mesoscale to the near-atomic scale, we have also conducted an extended study on the morphology and dimensions of the mineral particles. The main finding is that studying the same particle population at different magnifications yields different results for mineral habit, dimensions, and dimensional distributions. As glaucophane may occur as an elongate mineral particle (e.g., asbestiform glaucophane occurrences in California and Nevada), the observed discrepancies therefore need to be considered when assessing potential breathability of such particles, with implications for future regulations on elongate mineral particles. While the sample preparation and particle counting methods are not directly investigated in this work, our findings suggest that different magnifications should be used when characterizing an elongate mineral particle population, irrespective of whether or not it contains asbestiform material. These results further reveal the need for developing improved regulation for elongate mineral particles. We thus propose a simple methodology to merge the datasets collected at different magnifications to provide a more complete description and a better risk evaluation of the studied particle population.
在本文中，我们介绍了对在意大利西北部皮埃蒙特地区采集的青花瓷样品进行多分析鉴定的结果。研究方法包括光学显微镜、粉末 X 射线衍射、傅立叶变换红外光谱、μ-拉曼光谱、莫斯鲍尔光谱、电子探针显微分析、环境扫描电子显微镜和能量色散 X 射线光谱，以及结合能量色散 X 射线光谱和电子能量损失光谱的扫描/透射电子显微镜。除了对样品进行从中观尺度到近原子尺度的晶体化学表征外，我们还对矿物颗粒的形态和尺寸进行了扩展研究。主要发现是，在不同的放大倍率下研究相同的颗粒群，会对矿物习性、尺寸和尺寸分布产生不同的结果。由于青花烷可能作为一种细长的矿物颗粒出现（如加利福尼亚州和内华达州出现的石棉状青花烷），因此在评估此类颗粒的潜在透气性时需要考虑观察到的差异，并对未来有关细长矿物颗粒的法规产生影响。虽然这项工作没有直接研究样品制备和颗粒计数方法，但我们的研究结果表明，在确定细长矿物颗粒群的特征时，无论其是否含有石棉状物质，都应使用不同的放大倍数。这些结果进一步表明，有必要改进对细长矿物颗粒的监管。因此，我们提出了一种简单的方法来合并以不同放大倍率收集的数据集，以便对所研究的颗粒群进行更全面的描述和更好的风险评估。
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