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首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >An absorption method for extraction and characterization of porewater from low-permeability rocks using cellulosic sheets
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An absorption method for extraction and characterization of porewater from low-permeability rocks using cellulosic sheets

机译：纤维素薄板从低渗透岩石中提取和表征孔隙水的吸收方法

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摘要

Characterization of porewater chemistry in low-permeability rocks can provide insight into the origin and residence time of porewater, the history of fluid movement and the nature of transport and reaction processes. However, the measurement of porewater chemistry in low-permeability rocks is challenging because of the small fluid volume and the difficulty of extracting representative samples. Several techniques are available, but the results they provide can be affected by ion exchange and mineral dissolution, and they may require independent porosity measurements. The objective of this work is to develop a method of extracting representative samples of in situ porewater from low-permeability rocks and accurately quantify solute concentrations in the extracted porewater. A preliminary trial demonstrated the feasibility of extracting porewater by absorption into hydrophilic cellulosic membranes from low-permeability shale (Georgian Bay Formation, Michigan Basin, southwest Ontario, Canada). Solute concentrations are calculated from independent measurements of solute mass quantified by Inductively-Coupled-Plasma Mass Spectrometry (ICP-MS) and water-content quantified by Near Infrared (NIR) spectrometry. Sorption experiments indicate that there is no preferential sorption of solutes (Na, Cl, Mg, Ca, K, Sr, and Br) to the cellulosic membrane. The results indicate that the method is capable of determining solute concentrations on absorbed porewater with analytical precision that is within the margins of error recommended by EPA Method 6020a for analysis of saline water samples.
机译：低渗透率岩石中孔隙水化学特征的表征可以洞悉孔隙水的起源和停留时间，流体运动的历史以及运输和反应过程的性质。然而，由于流体体积小且难以提取代表性样品，因此在低渗透率岩石中进行孔隙水化学测量具有挑战性。可以使用几种技术，但是它们提供的结果会受到离子交换和矿物溶解的影响，并且可能需要独立的孔隙率测量。这项工作的目的是开发一种从低渗透性岩石中提取代表性孔隙水样品的方法，并准确地定量提取的孔隙水中的溶质浓度。初步试验证明了通过吸收低渗透性页岩（乔治亚湾组，密歇根盆地，西南安大略省，加拿大）的亲水性纤维素膜来提取孔隙水的可行性。溶质浓度由通过电感耦合等离子体质谱（ICP-MS）定量的溶质质量的独立测量和通过近红外（NIR）光谱定量的水含量的计算得出。吸附实验表明，溶质（Na，Cl，Mg，Ca，K，Sr和Br）没有优先吸附到纤维素膜上。结果表明，该方法能够以分析精度确定吸收的孔隙水中的溶质浓度，该精度在EPA方法6020a建议的用于分析盐水样品的误差范围内。

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