Subcritical water extractor for Mars analog soil analysis.
Subcritical water extractor for Mars analog soil analysis.
复制标题
用于火星模拟土壤分析的亚临界水提取器。
DOI：
10.1089/ast.2007.0154
复制
发表时间：
2008
期刊：
影响因子：
4.2
通讯作者：
P. T. Yung
中科院分区：
文献类型：
--
作者：
X. Amashukeli;F. Grunthaner;S. Patrick;P. T. Yung
从各种固体基质中快速有效地提取生物标志化合物的技术是成功实施火星风化层原位化学分析的关键要求。在这里，我们描述了一种便携式亚临界水提取器，它通过调节温度和压力来调节液态水的介电常数，从而模仿多种有机溶剂的极性。2005年夏天，从阿塔卡马沙漠（火星风化层模拟物）的Yungay地区采集的土壤样本被用来测试仪器的性能。从样品中提取的总有机碳浓度为百万分之0.2-55.4。将提取数据与通过标准分析程序测定的散装土壤中的总有机碳含量进行比较。在25-250摄氏度的温度范围内，在20.7 MPa的固定压力下检查仪器的性能。在这些条件下，水保持在亚临界流体状态，介电常数在约80（在25摄氏度）和约30（在250摄氏度）之间变化。
Abstract Technologies that enable rapid and efficient extraction of biomarker compounds from various solid matrices are a critical requirement for the successful implementation of in situ chemical analysis of the martian regolith. Here, we describe a portable subcritical water extractor that mimics multiple organic solvent polarities by tuning the dielectric constant of liquid water through adjustment of temperature and pressure. Soil samples, collected from the Yungay region of the Atacama Desert (martian regolith analogue) in the summer of 2005, were used to test the instrument's performance. The total organic carbon was extracted from the samples at concentrations of 0.2-55.4 parts per million. The extraction data were compared to the total organic carbon content in the bulk soil, which was determined via a standard analytical procedure. The instrument's performance was examined over the temperature range of 25-250 degrees C at a fixed pressure of 20.7 MPa. Under these conditions, water remains in a subcritical fluid state with a dielectric constant varying between approximately 80 (at 25 degrees C) and approximately 30 (at 250 degrees C).