Near-infrared as a swift method to quantify dioctahedral smectite content in bentonite

IF 5.3 2区 地球科学 Q2 CHEMISTRY, PHYSICAL
Faisal A. Gread , Valéria Kureková , Ángel Santamaría-López , Marek Osacký , Peter Uhlík
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Abstract

Near-infrared spectroscopy is one of the fastest available analytical methods, and it is susceptible to clay minerals in the studied samples or terrains, making it potentially valuable for quantifying clay minerals' content. Nevertheless, its practical applicability for this task needs to be rigorously tested. In this study, we sought to evaluate its effectiveness by retrieving the smectite quantity from controlled binary, ternary, and polymineralic mixtures with common bentonitic components based on the measured spectra using the linear spectral unmixing technique. Encouragingly, the results were auspicious, with an average deviation of (15 % for quartz, and ∼ 7 % for feldspar) binary mixtures, ∼7 % for ternary mixtures, and ∼ 3 % of the actual values for polymineralic mixtures. Combining multiple parameters from different absorption features in the unmixing model provided greater statistical independence. These parameters were selected based on their statistical significance. Stepwise regression indicated that the most dependent parameters regarding smectite content are related to the 2.20 μm (4530 cm−1) absorption feature, these findings support the previous studies which utilized the OH vibration region for smectite quantification. The developed automated unmixing model offers several benefits for quantification: it is fast, straightforward, and neither requires complex sample preparation nor the development of a comprehensive standard library or dataset.

Abstract Image

近红外快速测定膨润土中二八面体蒙脱石含量
近红外光谱法是目前最快速的分析方法之一,其易受研究样品或地形中粘土矿物的影响,因此在定量粘土矿物含量方面具有潜在的应用价值。然而,它对这项任务的实际适用性需要进行严格的测试。在这项研究中,我们试图通过使用线性光谱分解技术从含有常见膨润土成分的受控二元、三元和多矿物混合物中检索蒙脱石数量来评估其有效性。令人鼓舞的是,结果是吉祥的,石英二元混合物的平均偏差为15%,长石为~ 7%,三元混合物为~ 7%,多矿物混合物的实际值为~ 3%。在分离模型中结合来自不同吸收特征的多个参数提供了更大的统计独立性。这些参数是根据其统计显著性来选择的。逐步回归结果表明,影响蒙脱石含量的最主要参数与2.20 μm (4530 cm−1)吸收特征有关,这些结果支持了以往利用OH振动区定量蒙脱石的研究。开发的自动解混模型为定量提供了几个好处:它快速,直接,既不需要复杂的样品制备,也不需要开发全面的标准库或数据集。
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来源期刊
Applied Clay Science
Applied Clay Science 地学-矿物学
CiteScore
10.30
自引率
10.70%
发文量
289
审稿时长
39 days
期刊介绍: Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...
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