Characterization of dissolved organic matter in anoxic rock extracts and in situ pore water of the Opalinus Clay
Characterization of dissolved organic matter in anoxic rock extracts and in situ pore water of the Opalinus Clay
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DOI：
10.1016/j.apgeochem.2007.09.001
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发表时间：
2007-12-01
影响因子：
3.4
通讯作者：
Kretzschmar, Ruben
中科院分区：
文献类型：
--
作者：
Courdouan, Arnandine;Christl, Iso;Kretzschmar, Ruben
溶解有机物（DOM）从蛋白石粘土，一个潜在的寄主岩石的放射性废物的处置，分离在严格缺氧条件下从地面岩石材料和DOM的原位孔隙水样品进行比较。对于浸提，使用去离子水、合成孔隙水（SPW，在孔隙水浓度下含有所有主要离子但不含有机物的水）和0.1 M NaOH。研究了料液比、提取时间、酸预处理和O2-暴露等因素对DOM提取的影响。采用液相色谱-总有机碳检测器（LC-OCD）和反相离子色谱法（RP-Ion Chromatography）对孔隙水和岩石提取物中DOM的粒径分布和低分子量有机酸（LMWOA）含量进行了表征，结果表明，岩石中只有一小部分总有机碳（
Dissolved organic matter (DOM) from the Opalinus Clay, a potential host rock for the disposal of radioactive waste, was isolated under strictly anoxic conditions from ground rock material and compared with DOM of in situ pore water samples. For the extractions, deionized water, synthetic pore water (SPW, water containing all major ions at pore water concentrations but no organic matter) and 0.1 M NaOH were used. The influence of the solid-to-liquid ratio, extraction time, acid -pretreatment and O-2 exposure of the rock material on the isolated DOM were investigated. Liquid chromatography coupled with a total organic C detector (LC-OCD) and reverse-phase ion chromatography were used to characterize the DOM size distributions and to determine the low molecular weight organic acid (LMWOA) contents in the pore water samples and the rock extracts.The results revealed that only a small portion of the total organic C of the rock material (