The criminal police captain Gong Haonan's expression was very solemn, because he suspected that the case was phosgene poisoning, and four teenagers had three deaths and one injury due to inhaling phosgene in different concentrations.

"The toxicity of phosgene is so great?!" Li Meng looked at the news projected on the screen, and his mind was that there were three dead people in the Jinbo Hotel, and the boy lying in the hospital.

Gong Haonan nodded, pressed the remote control in his hand, and a detailed information about phosgene appeared in front of us.

"Phosgene, also known as carbonyl chloride, with the chemical formula COCl2, is an important organic intermediate and a very active electrophile.

Phosgene has the characteristics of high toxicity, non-flammability, high chemical reactivity, and strong corrosiveness when exposed to water. Slightly soluble in water, soluble in most organic solvents such as aromatic hydrocarbons, benzene, carbon tetrachloride, chloroform, acetic acid, etc. It is made from a mixture of carbon monoxide and chlorine by activated carbon.

Phosgene is a colorless gas at room temperature, with the smell of rotting grass, and at low temperature, it is a yellow-green liquid, with unstable chemical properties, and is rapidly hydrolyzed when exposed to water to generate hydrogen chloride.

Inhalation of phosgene can damage the respiratory tract, leading to chemical bronchitis, pneumonia, pulmonary edema. When inhaled at higher concentrations of phosgene, it can cause severe poisoning and even death.

Normally, when the concentration of phosgene reaches 100-300mg per cubic meter, it can cause respiratory arrest and cardiac arrest within 15 minutes. ”

Gong Haonan selected the important parts and dictated them for us.

"The phosgene is so powerful, the boy in the hospital is really fatal."

After listening to Gong Haonan's description, we all deeply pinched a cold sweat for the boy in the hospital. If he hadn't suppressed his curiosity and inhaled phosgene, or had stayed in the room where phosgene existed for a long time, they would most likely have been poisoned by now.

"Phosgene is simply a murderous weapon, colorless gas, which cannot be prevented, comparable to chemical weapons." Xue Hang said lightly.

In this way, someone deliberately replaced Xiao Q with phosgene and sold it as Xiao Q on the D product black market. This kind of behavior is obviously homicide, so what is the purpose of the murderer? I twisted my fingers, gently pressed my fingertips against my temples, and asked a crucial question.

The question is the nature of the case, that is, the murderer's motive for killing.

"If the murderer wants to poison them in a targeted manner, then he will pretend to be a person who sells laughing Q and sell phosgene to them. But if that's the case, the police can easily lock down and find the killer through the source of the purchase of the laughing Q. This is not quite in line with the psychology of committing a felony, the purpose of poisoning is to commit a crime remotely, leaving no traces of oneself, which will expose oneself instead. Li Meng assumed the process of killing people according to normal logic, but quickly denied himself.

If you think about it from this angle, then the position of the murderer should be the production link of Xiao Q, and the cylinder containing phosgene is mixed with Xiao Q for sale. But if that's the case, how can you be sure that the murderer's target will accurately purchase the gas bottle? Lin Zifan continued to analyze Li Meng's hypothesis, but found that this was a dead end and a contradictory idea.

"The only reasonable scenario is that the killer would commit indiscriminate killing." Xue Hang said coldly.

If the murderer used phosgene to replace Xiao Q to carry out an indiscriminate attack, then the situation would become very serious, because it shows that there are many poisonous substances including phosgene in the D market.

And the people who will be poisoned in the end must be drug-related personnel who buy D products.

"I think the murderer is what we have been discussing before, the second D-related force that appeared in Renxi City, and this second force wants to disrupt the D-product trading market in Renxi City." Jiang Tingbai thought about it and suddenly spoke.

This idea of his is also a suspicious idea that we came up with after discussing it with the anti-narcotics police before.

However, at that time, we had not yet encountered the case of phosgene poisoning, and at that time, we only found that more and more D products appeared on the market, which generated suspicions.

But with the phosgene poisoning case, things seem to have taken a turn for the worse.

"If it is a malicious competition between the two D-making groups, then they will definitely not harm the D-absorbing personnel, thinking that these people are their 'buyers'. Moreover, the production cost of phosgene is much higher than that of Xiaoq, and it seems to be a bit too much to use this kind of loss-making business to compete maliciously. Gong Haonan said in a deep voice.

"Team Gong has a point, and I'm thinking about it. Putting aside the D-group, let's go back to the case itself. When a murderer kills, he must have his own motive for killing. So what is the motive of the murderer in this phosgene poisoning case? In other words, what is the purpose of the murderer's use of such a 'loss' method? ”

"Not only that, but there is also an important question, that is, where did the phosgene used by the murderer come from?" Li Meng then added.

Returning to the case itself, the two major doubts that are now in front of us are, in the final analysis, the murder weapon and the motive for the murder.

Thinking about the case from the murder weapon and motive is also the most common method used by our criminal police, and it is also the most reliable.

As long as you figure out these two issues and cooperate with the on-site investigation and investigation visits, it is easy to find the core of the whole case.

Gong Haonan nodded, took out a piece of information, and said to us: "We just investigated the chemical phosgene, which is one of the high-temperature pyrolysis products of chlorine plastics. used as an intermediate in organic synthesis, pesticides, drugs, dyes and other chemical products.

Through aliphatic chlorocarbons, such as chloroform, trichloroethylene, etc., phosgene can be produced when burned. Phosgene in the environment mainly comes from production processes such as dyes, pesticides, and pharmaceuticals. ”

"Phosgene is a toxic gas, and the factories that produce phosgene are strictly controlled, and it is almost impossible for the murderer to obtain phosgene from formal channels such as factories. So will the murderer have the ability to produce phosgene on his own? Lin Zifan paused and said suddenly.

"Because phosgene is a toxic gas, if you want to synthesize it, you must have a very specialized chemical laboratory. If the murderer's chemical knowledge is strong enough and the chemical laboratory is professional enough, it is entirely possible to produce and synthesize phosgene by himself. Gong Haonan said seriously.

"Chemistry lab?" I pursed my lips, and an image flashed through my mind.

"Could this case be related to the case of Agen's poisoning?" I paused, and suddenly asked: "Because of the poisoning of the ricin used by Agen, and the ricin is likely to be refined by the murderer in the chemical laboratory through his own chemical technology." ”

After listening to my words, everyone nodded.

"Ricin and phosgene are both highly toxic, but the chemical state is different, and most importantly, they both require chemical laboratories."