Zhang Zhitong and a group of policemen were like a group of ignorant college students who stepped into the laboratory for the first time to watch the professor do experiments.
They surrounded the German Goldman atomic absorption spectrometer with both nervousness and expectation.
The mystery of the concrete wall has been solved. As long as the puzzle of the remaining safe is solved, they can more accurately determine the occupation of the criminal according to the way of committing the crime.
This time the analysis took a little long.
Because the sample preparation of the atomic absorption spectrometer is more cumbersome, it is necessary to collect and test the sample first, vaporize the sample, and observe the spectrum produced when the sample absorbs radiation through radiation projection.
This was a very high-tech inspection method. Under this inspection method, all foreign substances in the hole that had been ablated by the high temperature had nowhere to hide.
Take a simple example.
When Ye Qing ate the jar chicken in Shanghai, he used the earthwork method to detect heavy metal residues in it.
If it was tested with an atomic absorption spectrometer, not to mention seriously exceeding the limit. Even if this jar chicken had only eaten one mouthful of harmful heavy metal food in its life, the spectrometer could detect it.
An hour later, the test results came out.
The report sheet was all elemental compositions expressed in English and symbols, and the technician deliberately translated them into Chinese. The policemen looked at the elemental compositions one by one, as if they had found a treasure.
Ferrous oxide, ferric oxide, aluminum trioxide, nickel oxide, magnesium oxide, monocalcium aluminate, silica, calcium carbonate...
From the test results, almost all the metal compositions on the safe were burned into another substance by the high temperature.
The test results also indicated the proportion of these components in the sample, among which the proportion of iron was the largest, accounting for 55%.
"Wait, shouldn't the safe be metal? Why are there non-metallic substances such as monocalcium aluminate and silica in it?"
A sharp-eyed policeman, as if Columbus had discovered the New World, shouted excitedly, "These non-metallic substances are likely to be the key used by criminals to destroy the safe."
"What kind of chemical reaction is used? I remember that these ingredients can be used as chemical additives. "
Several policemen in the trace evidence inspection room immediately began to discuss the use of these non-metallic elements.
"Ahem ~"
Ye Qing couldn't bear to interrupt the policeman's "major discovery" and their heated discussion.
"I think... these non-metallic substances are part of the foamed fireproof partition material inside the safe."
"…"
The heated discussion in the small circle from the trace evidence examination room suddenly became awkward, and their hearts turned cold.
"Ye Qing, if that's the case, wouldn't there be no foreign elements in the hole created by the high temperature?" Zhang Zhitong was also very confused. When metals were heated in the air, there would be an oxidation reaction.
The large number of "oxidized" words on the test report sounded very high and mighty, but in fact, it was just ordinary iron, aluminum, magnesium, and nickel after burning.
Ye Qing did not answer the question. Instead, he continued to look at the test report.
Zhang Zhitong was right. The metal composition in the report was one of the materials used to make the safe shell. There was no foreign material.
Things seemed to have become illogical all of a sudden.
There must be a medium for combustion. If a match was used to ignite it, there would be residual elements such as phosphorus and sulfur. When ignited by a mixture of flammable gases, there would inevitably be residual elements such as alkane gas, olefin gas, acetylene gas, and so on.
This world belonged to science. There was no magic or cultivation.
It didn't seem scientific, but it was definitely because they hadn't found the real mystery.
The police were completely confused. They felt that their IQ was no longer worthy of arresting these mysterious criminals.
Some people stared at the floor, some stared at the test report dejectedly, and some leaned against the chair and sighed. All of them were unable to hide their frustration and loss.
"So that's how it is."
Ye Qing suddenly showed a confident smile.
This sentence was more effective than a cardiac stimulant. The police hurriedly raised their heads and stared at Ye Qing without blinking. At the same time, they were all ears.
"There are no foreign elements, but the ratio of the original metal composition is not right." Ye Qing pointed to several metal compositions on the test report, and the corners of his mouth curled up. "Aluminum, magnesium, the composition is not right."
"Adding aluminum to metal materials can improve the strength and corrosion resistance of the metal. But the aluminum content in this report is over the limit. "
"The wear-resistant steel used in safes is usually the KN60 model. Judging from the metal composition of this safe, this is also used. I remember that in this kind of wear-resistant steel, the proportion of aluminum added is only 3%, but the aluminum detected here accounts for 15%. "
"The proportion of magnesium added is even lower. It seems to be less than 1%, but 5% is detected here."
No way, even the alloy used can be summed up from the metal composition?
The police admired, but they couldn't help but wonder what would happen if there was more aluminum and magnesium?
"Any alloy formula is the best ratio value obtained after a long period of practice. No factory will make such a stupid mistake of making a wrong ratio."
"Since the factory can't be wrong, it means that the extra aluminum and magnesium were added by the thieves."
"Add aluminum and magnesium?" Zhang Zhitong frowned. "What do these people want to do?"
"They should also add iron oxide, but there is too much iron in the safe shell. There is not much change in the test report."
"Add iron?"
"It's a very wonderful idea." Ye Qing praised: "This group of people is definitely not as simple as understanding industrial processing, but they are very proficient and can be called engineers."
"Thermite reaction, also known as thermite agent."
"Mix aluminum powder and iron oxide powder together, and use magnesium powder as an igniter."
"If the mixing ratio is right, it can generate a high temperature of more than 3,000 degrees after ignition. In industrial applications, this method will be used to melt refractory metals or metal welding."
Another unpopular technology was learned by them, and the police listened with their heads nodding.
However, Mr. Ye said that this method was usually used to melt metals or weld metals. Then it should not be able to ablate out such a hole that was shot with a bullet, right?
"High-pressure jet."
Ye Qing said with certainty, "Mix very fine metal powder in a pressure vessel, and the ignition effect is no less than the metal jet of an armor-piercing bullet."
"The finer the metal powder, the more intense the combustion. Take the most common iron, for example. Ordinary iron can't be burned with a lighter for a lifetime. However, nano-level iron powder can be ignited with a little fire. And nano-level iron powder can be bought online. "
"For this group of industrial experts, burning through the safe shell and using a few small tools can pry open the internal mechanical lock structure."
"…"
Oh my god, which engineer had nothing better to do than to become a thief?
With this technology, why steal jewelry? Go to the United States to be a spy and steal high-tech information.
After listening to Ye Qing's popular science, the police officers were about to burst into tears. They felt that these industrial experts were too terrifying.
If …
What would happen if an industrial genius like Mr. Ye did those illegal things?
This was a very desperate speculation. However, the police officers present thought about it again. Mr. Ye could casually take out something that could equal the price of their headquarters building.
They immediately felt relieved and at ease.
Tens of millions of gold and jewelry were probably just a pile of dispensable materials in his eyes.
"This will be a big case that will cause a sensation in the internal system of the national police." After exclaiming for a long time, Zhang Zhitong sighed. "I really don't have the confidence to catch them if they can come up with such unheard of criminal methods."
"Give it a try and check the major universities and laboratories. Ordinary technicians don't have the ability to do this. If the ratio of thermite is not good, it will become a firebomb and burn yourself into a turkey. "
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