What is hidden in the lunar sample brought back by Chang'e 5? Wuhan team allows the experimental loss from milligrams to micrograms.

The Yangtze River Daily Da Wuhan Client News (Reporter Chen Xiaotong Correspondent Wang Junfang) How to find the clues of the lunar surface minerals as much as possible from the lunar soil with the size of the nails and the thinning of the hair. On July 2, a reporter from the Yangtze River Daily learned from the China University of Geology (Wuhan) that the school's Yueyang research made new progress in the Yueyang research of Professor Wang Zaicong: they developed a new technology, which consumed a small amount of samples, and they could measure simultaneously at the same time. The particle size and mineral composition of the Chang'e 5 moon soil sample.

Use the Raman spectrum automatic micro -granular analysis technology to measure the process of monthly soil particle size and mineral composition at the same time.

In 2020, the Chang'e 5 sample compartment successfully brought back 1731 grams of moon samples. This is the first time that my country has completed the collection of out -of -the -art celestial samples. The first batch of China University of Geosciences (Wuhan) applied for scientific research on precious 200 mg samples.

"The monthly soil size of the recovery is very small, far more thinner than human hair. The granules are invisible at all with the naked eye, and the research is time -consuming and laborious. And the sample we get is extremely limited. Get results as much as possible. "

Wu Zhenbing said that if you want to study the average ingredients of the month, you need to conduct destructive research on some samples to maximize the value of scientific research. The 200mg powder sample is packed in a small protective bottle, which is enough to fill the bottom of the bottle. Among them, only 50 mg can be used for damaged research, and only the size of the nail lid is open, which means that the traditional research method is no longer appropriate.

Since the 1970s, scientists have been using various means to study monthly soil samples. However, the method used by predecessors must either consume a lot of samples, which are generally measured in grams or milligrams; either need to consume a lot of time and cannot distinguish some elements to form the same minerals.

For the reconstruction results of the composition and distribution of soil granules in the range of 6mm × 3mm, different colors represent different minerals.

"Doing dojos in the snail shell." The team formed a moon soil research team composed of cross -disciplinary disciplines, including teachers and students in many disciplines such as geomic chemistry, mineral rock science. Based on the WITEC Raman spectrum micrometer analysis technology, they have developed a new method of particle size and mineral composition with extremely low samples and at the same time, and successfully applied to the research of Chang'e 5 Monthly soil sample.

Such research methods only need about 30 micrograms of samples each time. While obtaining multi -dimensional information, the sample loss is minimized, and the sample preparation process is simple, which greatly reduces the sample pollution problem that the link may bring. In addition, this method can quickly establish a mineral particle size and a diversified information database that helps to find rare mineral phases.

More importantly, the further development of this method will also provide technical support for the rapid analysis of micro particles returned by other celestial bodies such as Mars and Asteroids in the future.

Through this method, some of the rare minerals in the moon have discovered some rare minerals in the moon, such as aphamith, quartz, square quartz, and trapezi pyroxia. This shows that the Chang'e 5 moon soil may contain a small amount of substances from the moon highland. It provides a reference for the ground value data of the in northern region of the Chang'e -5 landing in the northern part of the storm, which is a reference for understanding the deep and surface evolution history of the moon. Provides a new perspective.

It is understood that this achievement has recently been published online in "Chinese Science: Earth Science". There are many studies in the team, including research on the micro form, structure, and chemical composition of the moon soil. Many new results will be published one after another.

【Edit: Zhang Jing】

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