Rapid contamination during storage of carbonaceous chondrites prepared for micro FTIR measurements
Rapid contamination during storage of carbonaceous chondrites prepared for micro FTIR measurements
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DOI：
10.1111/j.1945-5100.2009.tb00750.x
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发表时间：
2009-04-01
影响因子：
2.2
通讯作者：
Zolensky, Michael E.
中科院分区：
文献类型：
--
作者：
Kebukawa, Yoko;Nakashima, Satoru;Zolensky, Michael E.
用傅里叶变换红外（FTIR）显微光谱法研究了塔吉什湖（C2）和默奇森（CM 2）碳质辉长岩样品中的有机污染（与2965和1260 cm（-1）峰相似），这些碳质辉长岩含有丰富的含水矿物。另一方面，无水球粒陨石（苔藓，CO 3）没有被污染。当压在Al上的样品储存在包括硅橡胶垫的容器中时，这种污染发生在储存的一天内。通过长光程气室FTIR测量硅橡胶垫，检测到与污染物具有相似峰的挥发性分子。当硅胶和含水矿物（如蛇纹石）储存在包括硅橡胶、硅脂或胶带的容器中时，挥发性污染物的快速吸附也会发生。然而，当储存在没有这些化合物的玻璃和聚苯乙烯容器中时，它们没有显示出任何污染。因此，珍贵的天文样品，如陨石，行星际尘埃颗粒（IDP），以及来自小行星，小行星和火星的任务返回样品，应在没有硅橡胶，硅脂或胶带的玻璃容器中储存一天内通过微型FTIR进行测量。
Organic contamination (similar to 2965 and similar to 1260 cm(-1) peaks) was found on Tagish Lake (C2) and Murchison (CM2) carbonaceous chondrites containing abundant hydrous minerals by Fourier transform infrared (FTIR) microspectroscopy oil the samples pressed on Al plates. On the other hand, anhydrous chondrite (Moss, CO3) was not contaminated. This contamination occurred within one day of storage, when the samples pressed on Al were stored within containers including silicone rubber mats. Volatile molecules having similar peaks to the contaminants were detected by long-path gas cell FTIR measurements for the silicone rubber mat. Rapid adsorption of the volatile contaminants also Occurred when silica gel and hydrous minerals such as serpentine were stored in containers including silicone rubber, silicone grease, or adhesive tape. However, they did not show any contamination when stored in glass and polystyrene containers without these compounds. Therefore, precious astronomical samples such as meteorites, interplanetary dust particles (IDPs), and mission-returned samples from cornets, asteroids, and Mars, should be measured by micro FTIR within one day of storage in glass containers without silicone rubber, silicone grease, or adhesive tape.