A new dual stainless steel cryogenic trap for efficient separation of krypton from argon and xenon,Journal of Analytical Atomic Spectrometry

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A new dual stainless steel cryogenic trap for efficient separation of krypton from argon and xenon
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-09-17 , DOI: 10.1039/d0ja00052c
Sandrine Péron _{1,

2,

3,

4} , Sujoy Mukhopadhyay _{1,

2,

3,

4} , Michael Huh _{1,

2,

3,

4}

Affiliation

The elemental and isotopic abundances of krypton and xenon provide critical insights into processes ranging from stellar nucleosynthesis to volatile accretion and paleotemperatures on Earth. Accurate and precise determination of the krypton and xenon elemental abundance and isotopic ratios requires sample purification and noble gas separation to avoid interferences in the mass spectrometer. However, effective separation of krypton (Kr) from argon (Ar) and xenon (Xe) has remained challenging. Here, we present a new cryogenic instrument associated with a new protocol to achieve an efficient and effective separation of Kr from Ar and Xe. Using two electropolished stainless steel cryogenic traps on a single cold head, distillation of the noble gases from one trap onto the other and temperature cycling of the traps to reduce the effect of cryotrapping allows ≥98% of the Kr in a sample to be recovered with <0.5% of the Ar and <1% of the Xe abundances of the sample. Likewise, more than 99% of the Xe fraction can be recovered with <1% Kr. No variations in the isotopic ratios of the separated Kr and Xe fractions are observed as a function of the signal size for air standards. Moreover, we find that krypton isotopes can be fractionated during Ar–Kr separation. We suggest that more accurate krypton isotopic compositions can be obtained by maximizing the recovered krypton fraction instead of minimizing the argon fraction within krypton.

中文翻译：

新型双不锈钢低温阱，可有效分离氩气和氙气中的rypto

k和氙的元素和同位素丰度提供了从恒星核合成到地球上的挥发物积聚和古温度等过程的关键见识。要准确，准确地确定k和氙的元素丰度和同位素比，需要进行样品纯化和稀有气体分离，以避免干扰质谱仪。然而，从氩气（Ar）和氙气（Xe）中有效分离of（Kr）仍然具有挑战性。在这里，我们介绍了一种与新协议相关的新型低温仪器，可实现从Ar和Xe高效分离Kr。在单个冷头上使用两个电抛光的不锈钢低温阱，将稀有气体从一个捕集阱蒸馏至另一个捕集阱，并通过对捕集阱进行温度循环以降低冷冻捕集的影响，可回收样品中≥98％的Kr，其中<0.5％的Ar和<1％的Xe样品的丰度。同样，用小于1％的Kr可以回收超过99％的Xe馏分。没有观察到分离的Kr和Xe馏分的同位素比随空气标准信号大小的变化。此外，我们发现k-同位素分离过程中可以分离出k同位素。我们建议可以通过最大化回收的k部分而不是最小化within中的氩部分来获得更准确的k同位素组成。同样，用小于1％的Kr可以回收超过99％的Xe馏分。没有观察到分离的Kr和Xe馏分的同位素比随空气标准信号大小的变化。此外，我们发现k-同位素分离过程中可以分离出k同位素。我们建议可以通过最大化回收的k部分而不是最小化within中的氩部分来获得更准确的k同位素组成。同样，用小于1％的Kr可以回收超过99％的Xe馏分。没有观察到分离的Kr和Xe馏分的同位素比随空气标准信号大小的变化。此外，我们发现k-同位素分离过程中可以分离出k同位素。我们建议可以通过最大化回收的k含量而不是最小化within中的氩含量来获得更准确的k同位素组成。

更新日期：2020-11-03

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