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于海燕, 阮青锋, 沙鑫, 杨育富. 应用元素分析-电子顺磁共振能谱研究不同颜色青海软玉致色元素[J]. 岩矿测试, 2019, 38(3): 288-296. DOI: 10.15898/j.cnki.11-2131/td.201805140130
引用本文: 于海燕, 阮青锋, 沙鑫, 杨育富. 应用元素分析-电子顺磁共振能谱研究不同颜色青海软玉致色元素[J]. 岩矿测试, 2019, 38(3): 288-296. DOI: 10.15898/j.cnki.11-2131/td.201805140130
Hai-yan YU, Qing-feng RUAN, Xin SHA, Yu-fu YANG. Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy[J]. Rock and Mineral Analysis, 2019, 38(3): 288-296. DOI: 10.15898/j.cnki.11-2131/td.201805140130
Citation: Hai-yan YU, Qing-feng RUAN, Xin SHA, Yu-fu YANG. Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy[J]. Rock and Mineral Analysis, 2019, 38(3): 288-296. DOI: 10.15898/j.cnki.11-2131/td.201805140130

应用元素分析-电子顺磁共振能谱研究不同颜色青海软玉致色元素

Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy

  • 摘要: 颜色是软玉价值的重要体现,青海软玉颜色丰富,而致色方面的研究较为滞后。近年来青海软玉致色研究多为翠青玉和烟青玉,认为Cr3+和Mn2+分别为翠青玉和烟青玉致色元素。青海软玉的颜色非单一色彩,如青白色、翠绿色、灰紫色等,因此青海软玉致色应包含多种致色元素。本文在前人研究的基础上,利用X射线荧光光谱法(XRF)、化学滴定法、电感耦合等离子体质谱法(ICP-MS)和电子顺磁共振能谱(EPR)测试数据,根据分析数据与色调变化之间的关系揭示了8种颜色青海软玉的致色元素。结果表明:白玉致色元素为Fe3+;青白玉和碧玉致色元素为Fe2+和Fe3+;青玉致色元素为Fe2+、Fe3+和高价态的Mn;翠青玉致色元素为Fe2+、Fe3+、Cr3+;黄玉和糖玉致色元素为Fe3+和高价态的Mn;烟青玉致色元素为Fe3+和Ti4+。研究认为青海软玉中绿色调与Fe2+有关,黄色调与Fe3+和高价态的Mn有关,而蓝紫色调与Fe3+和Ti4+有关。本研究基本确定了不同颜色青海软玉的致色元素,为青海软玉致色机制的研究提供了理论依据。

     

    Abstract:
    BACKGROUNDColor is the important manifestation of nephrite value. Qinghai nephrite has different colors, but there is a lack of research on coloration. In recent years, the study on the coloration of nephrite in Qinghai mainly focused on azure-green and blue-violet, and it was considered that Cr3+ and Mn2+ were respective coloration elements of azure-green and blue-violet. The color of Qinghai nephrite is not a simple color, such as white-green, azure-green, and blue-violet. Therefore, Qinghai nephrite should contain a variety of color-causing elements.
    OBJECTIVESTo reveal the color-causing elements of eight colors of nephrite from Qinghai based on the relationship between analysis data and hue changes.
    METHODSX-ray Fluorescence Spectrometry (XRF), Chemical Titration, Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Electron Paramagnetic Resonance Spectroscopy (EPR) were used to study the color-causing elements of nephrite.
    RESULTSThe color-causing element of white Qinghai nephrite was Fe3+. The color-causing elements of white-green and azure-green Qinghai nephrite were Fe2+ and Fe3+, respectively. The chromogenic elements of green Qinghai nephrite were Fe2+, Fe3+ and Mn in high valence. The color-causing elements of azure-green Qinghai nephrite were Fe2+, Fe3+ and Cr3+. The chromogenic elements of yellow and brown Qinghai nephrite were Fe3+ and high-valence Mn. Fe3+ and Ti4+ were the color-causing elements of blue-purple Qinghai nephrite.
    CONCLUSIONSThis study determined the color-causing elements of different colors of Qinghai nephrite, which provided a theoretical basis for the study of the coloration mechanism of Qinghai nephrite.

     

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