Chapter 39

The office space is limited. In the face of Zhao Heng's strange poisoning and death, Gu Chen's only idea is the method of committing a crime, and the identification is naturally completed by the technical department of the Municipal Bureau.

If we can't find out the way of committing the crime, we can't confirm the criminal evidence of the murderer.

"Gu Chen, you can say what you think. There is no outsider here." Officer Wang's depressed mood just now seems to be relieved.

He knew that Gu Chen seemed to have made some new discoveries.

"Wait a minute." Gu Chen didn't answer immediately, but handed over the account book information that could have been sent to Mr. Liu: "forensic Liu, can you check this account book for me?"

"Check the books?" Senior forensic veteran Comrade Liu, for a time slightly confused: "Gu Chen, I can't understand the account book."

"Don't understand." Gu Chen said with a light smile: "I mean, you just need to check for me. Does it contain highly toxic substances?"

"So it is." Liu felt that he had deviated from Gu Chen's idea and said with embarrassment: "it's easy to say."

Then he called for the forensic assistant: "Xiao Wu, help me get the toolbox."

While Liu was preparing, Gu Chen was not idle. He took a glass of water from the water dispenser, put it on the table and said, "elder martial sister Lu, can you help me bring the information around Zhao Heng?"

"Is this one?" Lu Weiwei is hesitant. She is not sure whether Gu Chen does this effectively, but she still hands over the account book.

Gu Chen opens the data book and immerses the footers in water one by one.

"There's residue on it, right?" Officer Wang bit his teeth and asked. He felt himself suddenly marginalized.

"Maybe this material is colorless and tasteless, so we can only try it first." Gu Chen faintly returned a sound.

Any doubt must be verified before it can be called evidence.

What Gu Chen has to do now is to verify whether his reasoning is correct.

You know, in a closed office, that's all the people in and out.

The only possible clue to Zhao Heng's poisoning death shortly after the three people left was that he had been exposed to some colorless and tasteless substances, leading to poisoning death.

Seeing Gu Chen immersing the information footers in clear water, officer Wang at this time did not need Gu Chen to explain, and probably guessed the reason for Gu Chen's doing so.

"Gu Chen." Police officer Wang pushed to him and looked at the information book to prevent himself from being marginalized.

Gu Chen moved a little, gave up a body position, and asked, "what's the matter with elder martial brother Wang?"

Then he continued to operate seriously.

Officer Wang looked at Gu Chen so seriously, but he could not help saying, "do you think that Zhao Heng's poisoning death is due to touching the foot of the information with his hand?"

"Elder martial brother Wang, you finally guessed." Gu Chen chuckles, and then throws the soaked data book aside.

"I think it should be coated with colorless and tasteless poisonous substance, which is not the same as the bottle of poison we found around Zhao Heng before."

"I see. You mean that bottle may be a cover up. What really caused Zhao Heng's poisoning and death may be the highly toxic substances left on the account books. Zhao Heng's habit of licking his hands with his tongue led to his exposure to the poisonous substances in the footers of the account books, right?"

Lu Weiwei according to Gu Chen's prompt, also quickly followed the train of thought.

Gu Chen nodded: "sister Lu is so smart."

By this praise, Lu Weiwei felt that she was about to fly, and her heart was warm.

Later, Gu Chen gave the remaining water to Liu.

The forensic assistant looked stunned and said: "Gu Chen, you are robbing my job."

Obviously, the forensic assistant also felt marginalized.

The technical section has a division of labor, which is generally composed of several senior forensic doctors, and assistants are allowed.

However, for the Jiangnan City with a population of nearly 10 million, the scale of technical departments is larger than that of ordinary counties and cities, and there are more things to be contacted.

At present, with two forensic assistants, Liu formed a working group to take charge of the daily work of police stations in various districts of the city.

"Xiao Wu," Liu called to the assistant

"Master, I'm here." The forensic assistant rushed up.

"Do things actively. Don't wait for things to be done. Take the initiative to find jobs. In my opinion, you lack the enthusiasm of looking after the morning."

Originally, I wanted to do something, but I didn't expect to be punished. The forensic assistant was also drunk.

Liu has always disliked lazy assistants, especially the work on his own hands. As a result, he was robbed by other departments.

"Yes, master." The forensic assistant nodded and He stares at Gu Chen fiercely again.

Gu Chen's operation is very simple. A simple chemical reaction method uses the solution to react with the detected substance. By observing the reaction, the color and state of the reactants can be used to determine whether there is a substance.Ordinary professionals can understand this basic operation, but Gu Chen is a trainee police officer, and has no intersection with forensic science.

It's very valuable to understand this.

Liu even had the idea of changing his apprentice.

"Young people should learn more skills." After cleaning up the tools in his hand, Mr. Liu couldn't help asking, "Gu Chen, have you learned these?"

"No Chen Gu shakes his head.

"Gu Chen usually goes to the library after work. I think he saw it there." Lu Weiwei, who has been paying close attention to her younger martial brother, said a word.

"It's good to know that." Liu is also in the operation at the same time, by the way.

"In our forensic examination, chemical reaction method is generally used, which has the advantages of simple operation, fast speed and less time and place restrictions, but it is not sensitive and specific. It is generally only used as a preliminary experiment to narrow down the scope of toxicological analysis."

Gu Chen listened carefully: "it seems that chemical reaction method is rarely used now, but in some cases, it can be used for confirmatory analysis."

"That's right." Liu nodded: "for example, according to Prussian blue reaction, we can judge whether there is cyanide in the tested substance, whether there is red in the Grignard reaction, and whether there is nitrite in the test solution. These are all the same reasons."

"But chromatography is more popular now." Gu Chen suddenly added that his mind is full of knowledge. It's really difficult for him to bear it.

"Chromatography is a method of separation and analysis." Liu forensic medicine from the toolbox, took out the domestic Xinhua filter paper, casually asked: "do you know which size is used?"

Gu Chen hesitated for a moment and chuckled: "No.1 11 μ m is the most frequently used medium retention flow rate in daily filtration. It is widely used in laboratory applications to clarify liquids, and is typically used for quantitative analysis and separation of precipitates, such as lead sulfate, calcium oxalate and calcium carbonate."

Liu forensic medicine hums a smile, indifferent way: "you say right, but are you sure to use this number?"

Although Gu Chen said quite reasonable, also very detailed, but now it seems, also is only understand some superficial.

However, these are very rare in Liu's mind.

"No Gu Chen shook his head and said with a smile, "if it was me, I would choose No. 5, which is 2.5 μ M."

Liu Fa Yi was stunned: "you go on talking."

"Because this is the most efficient qualitative filter paper." "It can be used to collect small particles with a slow flow rate. It is suitable for chemical analysis, clarification of suspended solids and water analysis."

Gu Chen said that, all the people present were stunned, and the forensic assistant standing on the side immediately hated him even more.

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