Chapter 454: Test results that scare the police (1/2)

Nervously and expectantly, they surrounded this German Goldman atomic absorption spectrometer.

The mystery of the concrete wall has been solved, and the remaining safe, as long as the puzzle is solved, they can more accurately locate the criminal's occupation according to the method of committing the crime.

The analysis time is a bit long this time.

Because the sample preparation of the atomic absorption spectrometer is relatively cumbersome, it is necessary to collect the test sample first, vaporize the sample, and use radiation projection to observe the spectrum generated when the sample absorbs radiation.

This is a very high-tech inspection method. With this inspection method, all foreign materials are invisible in the hole ablated by high temperatures.

Give a simple example.

When Ye Qing ate the altar chicken in Shanghai, he used the soil method to test that there were heavy metal residues in it.

If it is checked by an atomic absorption spectrometer, let alone a serious excess. Even if this altar chicken has eaten a harmful heavy metal food in its entire life, the spectrometer can detect it.

One hour later, the test result came out.

The report forms are all elements in English and symbols, and the technicians specially translated them into Chinese. The police, like treasures, looked at them one by one according to the elements inside.

Ferrous oxide, ferroferric oxide, aluminum oxide, nickel oxide, magnesium oxide, monocalcium aluminates, silica calcium carbonate...

From the test results, almost all the metal components on the safe were burned into another substance at high temperature.

The test results also indicate the proportion of these components in the sample, of which the proportion of iron is the largest, accounting for 55%.

”Wait, shouldn't the safe be made of metal? Why are there non-metallic substances such as monocalcium aluminates and silicon dioxide in it?”

A sharp-eyed policeman, Columbus was as excited as he discovered the New World and shouted: ”These kinds of non-metallic substances are likely to be criminals, the key to destroying the safe.”

”What kind of chemical reaction is used? I remember these ingredients can be used as chemical additives.”

Several police officers in the trace evidence examination room immediately began discussing the uses of these non-metallic elements.

”Ahem~”

Ye Qing couldn't bear interrupting the policeman's ”major discovery” and heated discussions with them.

”I think... these non-metallic substances are part of the foamed fire barrier material inside the safe.”

”...”

”Ye Qing, in this way, isn't there any foreign element in the hole ablated at high temperature?” Zhang Zhitong was also confused. When metal is heated in the air, an oxidation reaction will occur.

Then a lot of the words ”oxidized” on the test report sounded very high, but in fact, they are ordinary iron, aluminum, magnesium, and nickel, which become things after burning.

Ye Qing did not answer this question but continued to look at the test report.

Zhang Zhitong was right. The metal content in the report was one of the materials used to make the safe case, without any foreign matter.

Things seem to become unscientific.

There must be a medium in the combustion, which is ignited with a match, and residual elements such as phosphorus and sulfur will inevitably be detected in it. Ignite with mixed flammable gas, and it will inevitably leave the residual elements of common alkane gas, olefin gas, acetylene gas, etc.

This world belongs to science, there is no magic, and there is no cultivation.

Seemingly unscientific, it must have failed to find the true mystery.