Police Detective

　　 After Director Ma ordered, several people inside quickly withdrew.

　　 On the first and second floors, all windows and doors were opened, waiting for the scene to evaporate naturally.

　　 "Well, let's wait and then go in." Director Li looked at the warning belt, "Pull the warning belt out a bit, don't let people watch."

　　...

"Team Zhao, you take Xiao Wang and back up all the video data around here first; Team Li, you take Xiao Bai to take a look upstairs and stabilize the homeowner upstairs..." Director Ma Started on-site command.

　　 Here is a row of commercial streets, below is the underground garage, above are some ordinary residential buildings, and the first floor is the bottom shop.

　　 The way the thief entered was to rent the one upstairs in advance, and then, this afternoon, he began to open up the floor between the upstairs and the gold shop.

　　The building here is still relatively new. The floor structure is made of reinforced concrete. It is reasonable to say that it is extremely difficult to break through, but with hydrofluoric acid, reinforced concrete is not as good as plastic or wax.

　　Hydrofluoric acid and the hydrogen cyanide used in Sun's suicide case are completely two things. Since it cannot be completely ionized in water, hydrofluoric acid does not belong to the strong acid series, but this does not mean that this thing is not fierce. In fact, it can be said to be very acidic except that it does not act so fast.

　　 Because of this, this thing is also a controlled item, and ordinary people can't get it, but because it is a controlled item, once it appears, it is generally not a good use. However, as a policeman, after Bai Song mentioned hydrofluoric acid, everyone else was not unfamiliar. Because this acid has other uses in many cases...

　　 Downstairs, Director Ma listened to Hao Zhenyu's report and had a better understanding of the scene.

　　This kind of theft is unheard of, mainly because the movement is too loud. Does this thief really think he can run away? This kind of theft leaves behind the sea-like evidence on the scene...

　　Normal thief, just open the lock, secretly pry the door, and so on, how can there be such a big move with the alarm, the surveillance, and so on.

　　 But the people present, including the owner of the gold store, were a little bit amazed by the thief’s "hardcore operation". Such brainstorming is really rare.

After on-site investigation, it was indeed hydrofluoric acid that melted through the floor slab, and the amount was not small. The thief first pried the bedroom floor upstairs, then drew a circle on the concrete floor, and then surrounded the plastic board. , And sealed the circumference of the plastic board with substances of unknown composition, and then poured hydrofluoric acid.

　　Hydrofluoric acid has a relatively strong corrosion ability to silica and concrete, but the speed is not fast. This is a continuous process and requires continuous cleaning.

　　 Since this corrosion is not directed downwards, but diffused, the more it dissolves, the bigger the hole becomes, and it eventually melts through.

　　 The nature of this substance is very special. It is a weak acid.

　　 Weak acid should have been studied in junior high school, that is, acid such as acetic acid that cannot be completely ionized in water. However, when the concentration exceeds 5 moles per liter, self-couple ionization will occur. At this time, hydrofluoric acid is a very acidic acid, and it is natural to corrode the steel in reinforced concrete.

　　 This thing is toxic. High concentrations of hydrofluoric acid will naturally generate acid-containing fumes, which can cause devastating damage to the respiratory tract, and the lethal dose is only one or two grams. Therefore, the effect of gas masks on this can only be said to be average. Even if the room is full of remnants, you should wear full-body protective clothing and an oxygen ventilator.

　　 The inorganic chemistry that Bai Song is now studying is a very basic knowledge point.

　　The situation upstairs is that the bedroom dare not go in casually, one is afraid of damaging the scene, and the other is worried about the quality of the floor, so don't have any accidents.

　　 The homeowner really cried miserably. In this case, who will pay for it? How to repair this house? It can only be blocked for a while.

　　 The second floor was sealed off first, and the homeowner was also taken by the police station to take the transcript.

　　 Team Li and Bai Song went downstairs, went to Director Ma, and reported the situation on the second floor in detail.

Now there are no really good entry conditions. Everyone has heard about the power of hydrofluoric acid. Director Ma will not let people in anyway. He is a little scared. If it is not for Hao Zhenyu’s rich experience, he must wear protective gear and gas mask. There was even a big problem at this time.

The damage of hydrofluoric acid to the human body is a chronic process. It will actively react with calcium and magnesium ions, leading to the gradual failure of the organs that work on these two ions. Usually problems occur after several hours, and problems are discovered. It's too late.

　　 Director Ma confirmed again and again, but was still worried, and arranged for the police station to take four on-site investigators to the hospital. Both Wang Huadong and Sun Jie have exposed skin to a certain extent and need to use calcium gluconate gel for protection in time. This thing is really too fierce.

　　 The scene is here, I would rather not survey for the time being, and never let your subordinates have health or safety hazards.

　　 When he was doing a human face sketch last time, Director Ma was unwilling to find someone outside the branch. This time he was unambiguous and directly called the relevant department of the Municipal Bureau.

　　 After all, he was already the deputy director, and the phone number of the Ma Detachment went directly to the City Bureau Command Center, giving a detailed account of the situation on the scene. In addition, I have actually reported it once on the radio. This time I called it mainly for help.

　　When hazardous chemicals are involved, the city's strength is stronger, and it is too normal to report such things.

　　While waiting~www.wuxiaspot.com~ Director Ma held a meeting on the spot.

　　According to the items and evidence that have been extracted at the scene, the stolen jewelry basically corresponds to what the owner of the gold shop said. There are a total of six or seven jewelry cabinets in the store, half of which are silver jewelry and half of gold jewelry. There are also a few diamond rings and platinum jewelry scattered in each cabinet.

　　 The thief’s theft was very directional, and he went straight to the cabinet where the bracelet was stored, and nothing else moved.

The quality of this cabinet is not as good as expected. It is the reinforced metal cabinet, which cannot withstand the crowbar. The thief seems to have been prepared for a long time. .

　　 There are safes in the store. Generally speaking, new goods or goods that are not on the market, as well as gold bricks and gold ingots, have been kept in large safes worth several hundred thousand yuan. The clerk in this store does not have a safe key, so every day things are kept in each cabinet.

　　 The thief did not touch the safe, nor touch any other cabinets. At present, this cabinet is indeed the most valuable cabinet in the store. Because of the others, even if you put 100 rings, it is about 400 grams.

　　 I have to say that this was a successful act. Compared with many dumb thieves, the planning time should have been long.

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