Rotten egg smell!

Photophobia! Cough! Itchy throat! Dizzy!

Taken together, these characteristics resemble the symptoms of a deadly toxic gas, hydrogen sulfide poisoning.

Mild hydrogen sulfide poisoning: when the human body is exposed to less hydrogen sulfide concentration, mild poisoning symptoms can appear, manifested as photophobia, tearing, throat itching, irritating dry cough, chest tightness and other manifestations, after getting out of the poisoning environment, most of them can heal themselves within a few days, and can achieve the natural life expectancy survival time;

Moderate hydrogen sulfide poisoning: When the human body is exposed to relatively high hydrogen sulfide concentration, dizziness, fatigue, dyspnea, nausea, vomiting and other moderate poisoning symptoms can occur, and it is necessary to take oxygen inhalation, use of prednisone and other glucocorticoid drugs and other treatment methods in time to prevent cerebral edema, pulmonary edema, myocardial damage and other conditions. If the treatment is timely, it is generally not life-threatening, but there may be neurological and psychiatric sequelae, and the specific survival time varies from person to person;

Severe poisoning: When the human body is exposed to high concentrations of hydrogen sulfide, the phenomenon of "electric shock-like poisoning" can occur, which is manifested as instantaneous loss of consciousness, respiratory and cardiac arrest, in which case immediate sudden death usually occurs.

Judging from the symptoms and manifestations described by Wu Tingting, it is obvious that she is lucky, but she is mildly poisoned by hydrogen sulfide.

But!!!

Here comes a problem.

How can there be hydrogen sulfide in this small building?

Except for some specific industries that can be accessed, hydrogen sulfide is a controlled product for ordinary people.

Moreover, according to the information available so far, many people came to the suburbs by subway and then took a bus to the meeting place.

It is simply impossible to prepare hydrogen sulfide, a highly toxic and toxic gas, in advance.

Jiang Feng was puzzled, and his gaze swept around the hall.

His gaze suddenly rested on a garbage can.

He froze.

Inside the trash can, there is a completely deflated anime balloon and broken fireworks.

This kind of anime balloon is generally a hydrogen balloon!

And the fireworks ......

If the murderer is proficient in chemistry and medicine, he can use the reaction chemical equation of hydrogen sulfide to use the sulfur in the fireworks to react with the hydrogen in the hydrogen balloon to produce hydrogen sulfide.

H2+S=H2S。

Other words......

Jiang Feng suddenly realized that the murderer was likely to use these things at the scene to directly create the highly toxic and toxic gas hydrogen sulfide.

In this way, Jiang Feng's mind opened, and he instantly thought of another thing.

According to Wu Tingting's description, it is obvious that Li Xintong's house is likely to have been released by the murderer with hydrogen sulfide gas, but the murderer came out of it without the slightest sign of poisoning.

This made Jiang Feng's eyes fall on the coffee table in the living room, where a bottle had been opened and drank most of the soda.

If the murderer had a wealth of knowledge of chemistry and medicine and was able to synthesize hydrogen sulfide, then he probably did one more thing.

Baking soda reacts with hydrogen sulfide to produce sodium hydrosulfide, water, and carbon dioxide.

NaHCO3+H2S=Nahs+H2O+CO2

Baking soda NaHCO3 is the main ingredient in soda drinks.

Although sodium hydrosulfide synthesized from the two is also toxic, its toxicity is simply insignificant compared to hydrogen sulfide, and it is not fatal, but can only cause symptoms such as headaches.

And it is a solid crystal, if there is an adsorbate attached, as long as it is not inhaled, the harm is even less.

So.

Jiang Feng gradually had a certain picture of the murderer's murder process in his mind.

The murderer, wearing a hood, is likely to have something in his hood, such as a towel? Paper towel?

Sprinkle soda on top of these things, so that he can use the reaction of baking soda and hydrogen sulfide to avoid the highly toxic hydrogen sulfide gas, but face the sodium hydride crystals that are not harmful if they are not actively inhaled after the chemical reaction is generated.

Jiang Feng gradually had an idea in his mind.

And at this time, the captain of the first team looked at Jiang Feng in the east and in the west.

He was confused.

But as an old criminal investigator, his sense of smell is still very keen.

He could feel that Jiang Feng must have made some discovery.

Therefore, the captain of the first team quietly pulled Jiang Feng to the side, and he asked in a low voice, "Jiang Feng, have you found anything?" ”

Jiang Feng's face did not change, and he said lightly: "Captain, I think we should confirm a few more pieces of information, where did Li Xintong go during that time period?" Did you go to Wang Siyu's room? Who owns that bottle of soda on the table? Who else brought soda? Who brought the hydrogen balloon in the trash can? And the fireworks! ”

"In addition, I'm going upstairs to Li Xintong's room to have a look."

When the captain of the first team heard this, his eyes showed a slight joy.

Looking at Jiang Feng and asking, "Are you sure that this murderer who came out of the crowd is one of them?" Not someone who came from the outside? ”

Jiang Feng nodded, and he said: "The murderer must be the person present, because the poisonous gas he used, that is, the smell of rotten eggs that Wu Tingting smelled, is likely to be the toxic gas hydrogen sulfide, and hydrogen sulfide is synthesized on the spot, using the hydrogen in the hydrogen balloon and the sulfur in the fireworks to react to generate it." ”

"At the same time, the murderer also used the main ingredient in the sparkling water drink, baking soda to add a protective charm to himself, and used the principle of baking soda to react with hydrogen sulfide to form sodium hydrosulfide crystals to prevent hydrogen sulfide poisoning."

“......”

Jiang Feng told the captain of the first team his speculation.

Although the captain of the first team was a little confused and didn't know much about the technical terms in it, he still figured out one thing.

Figure out the inner logic of this.

I understand, this murderer who suddenly appeared, although I don't know if it is Murderer A or Murderer B, or if it is a new murderer, but it is certain that this murderer is hidden among the members of the Victim Memorial Association.

While understanding, the captain of the first team looked at Jiang Feng's young face, and his heart was shocked.

Now the young people trained by the Police Academy and the Public Security University are too perverted, and they are all like the gods, but the gods are blowing the knowledge of astronomy and geography, but Jiang Feng is real.

The captain of the first team continued, "Who do you think it will be?" Geng Li? Although it is written on her profile that she did well in chemistry in high school and studied medicine at the same time, she ...... According to the height described by Wu Tingting, it cannot be Geng Li. ”

"Especially the force of the casual collision when she escaped, Wu Tingting was knocked away directly and fainted, if she hadn't been discovered in time, I'm afraid she would have to look at the level of hydrogen sulfide poisoning you said, moderate or even severe hydrogen sulfide poisoning, and lose her life."

Jiang Feng shook his head and said: "Height can be disguised, especially as described by Wu Tingting, the murderer has a hood on his face, which can hide his hair, or cover up the traces of the wig cover, and the figure is even more so, under the wide sleeve robe, no one can judge." ”

"Geng Li's suspicion still can't be ruled out, and it's extremely suspicious...... However, the specifics still depend on the evidence. ”

Jiang Feng paused, and he continued: "This time is also a lucky thing in misfortune for us, the murderer has begun to gradually expose in front of us......