Panda Criminal Investigation Team

Li Qianqian was a little disappointed,

But soon excited again,

Like a detective's addiction: "There's a second,

Listen to me... During the two days when I didn't feel well,

Just bought a pair of jeans from Taobao,

Put it on without washing.previously bought clothes,

My mother will wash it again before letting me wear it,

Because the pants are not clean, but this time I didn’t wash them... Could it be that the thallium content in the jeans exceeded the standard?I checked online, if thallium poisoning,

Also toxic in contact with skin. "

Regarding this possibility, Yu Renjie pondered for a while and replied: "Your idea is very creative,

very novel,

But unlikely.Thallium is a rare metal unless working in a mine or laboratory,

It is not easy to touch it in life.There should be no such elements in clothing factories,

if any,

I'm afraid the line workers will be poisoned before you. "

Li Qianqian immediately raised the third possibility,

That was a spicy stick in the hands of a classmate she ate a few days ago.Just now when Yu Renjie asked her if she had eaten the food in the small workshop,

she wanted to say,

But afraid of hurting his classmates, he insisted on holding back, and only now carefully mentioned this matter.But this idea was quickly rejected as well,

She only ate one spicy stick,

Not enough to make her poisonous and hair fall out, while the classmate who ate the whole bag is still in school.

After confirming that Li Qianqian had never been to the mine, the chemical company or the chemical laboratory, Yu Renjie and others bid her farewell.At this time, there were less than 10 minutes left before the one hour agreed by Cheng Bin. They took the time to visit Li Qianqian's attending doctor, Wu Guangwei.And in just over ten minutes, they obtained extremely important information.

Doctor Wu told them that Li Qianqian's condition was basically stable, and she was no longer in danger of dying. Compared with Zhu Ling, the first person who caused a sensation all over the country due to thallium poisoning, her condition was much better. At this time, almost all the thallium in her body had been excreted. .

But an incredible thing happened during the treatment—after Li Qianqian was injected with the first batch of anti-drugs|drugs, the level of thallium ions in her serum dropped significantly, and her vital signs continued to rise. The next day, her condition relapsed, and the blood test results showed that the concentration of thallium ions rose slightly again.After increasing the dose of anti-drug|drugs, her condition became stable again and has continued to this day, but the reason for the rebound of thallium ions has not been solved, unless the thallium source is exposed again, the concentration of thallium ions in the human body is It will not rise suddenly.Was there some chemical change in her body, or had someone poisoned her a second time?

Yu Renjie checked the visit records of Li Qianqian on the day when her illness relapsed. Only the school leaders and her parents visited her that day, but they were obviously not the suspects in this case. Could it be that Li Qianqian ate poisonous food again by mistake?Maybe she didn't know it was poisonous, so she kept it with her all the time, and ate some after she recovered, after all, she was a greedy little fat man.

Thinking of this, Yu Renjie retreated, and suddenly opened the door of the women's ward, only to hear a slap, and the curtain between the two beds was drawn again.Yu Renjie said sorry about the direction of the bed, and walked towards Li Qianqian's bed.At this moment, Lin Hai was asking Li Qianqian to help him with his homework again, and Li Qianqian was still lying on her lap with an exercise book, which was the one her roommate had printed out for her.

"Hi," Li Qianqian winked at him playfully, "Are you back again?"

Yu Renjie nodded to her: "September 9, that is, this Tuesday, was there anyone else besides your parents and teachers?"

"No more." Li Qianqian shook her head and replied, Lin Hai's face was a little ugly at this time, he explained: "I have an exam that day, so I don't have time to come."

But Yu Renjie didn't care whether Lin Hai had been here at all: "Are you sure no one else has been here?"

"I'm sure. My roommates came on Wednesday. After they left, Lin Hai also came. I remember it clearly."

"Did you eat anything that day? Don't let go of anything suspicious, especially the things you brought yourself that were there before the poisoning."

"That day... I was a little sick, so I drank the porridge from the hospital. My parents brought some fish soup and fruit, and I ate a little. I didn't bring any food from school. All the snacks were in the hospital. In the bedroom."

"Is there nothing missing?"

"No, no more."

"Can I see your locker and personal belongings?"

"Oh, look."

Yu Renjie opened the door of the cabinet next to the hospital bed, and carefully checked the inside and outside of the cabinet. Sure enough, there was nothing but fruit and biscuits.Li Qianqian's thermos was on the table. Ever since she was hospitalized, all she drank was hot water from the hospital.The thermos and the ceramic bowl containing the apples were later brought back by Yu Renjie, although he himself thought it was unlikely that there was something wrong with them.

"Did you find anything?" Before they left, Li Qianqian asked him.

"Not yet." Yu Renjie said, and he handed Lin Hai his mobile phone number: "If you think of anything, please contact me at any time."

When they returned to the lobby, Cheng Bin had already lost his patience. He was shaking his legs and kept checking his watch and the clock on the wall, as if he wanted to confirm which was more accurate.When Yu Renjie greeted him, he glanced at his watch again and said angrily, "You are nine minutes and eight seconds late."

But when Cheng Bin learned the information from the doctor, he immediately joined the discussion: "If the hospital's visit records are not strict, will someone sneak in and poison you?" After a while, he asked himself again. Answer: "The corridors of the hospital are monitored, so it shouldn't be too much trouble to check."

When they got into the police car, Cheng Bin said, "Anyway, it's still early. I'll accompany you to the Chemistry Department of University X, and teach the two newcomers how to handle cases."

There is only one police car, and the key is still in Cheng Bin's hand. Of course, he has the final say.Xiao Mi dragged Hao Jinyang to grab the back seat quickly, Yu Renjie had no choice but to open the door of the passenger seat, and sat in reluctantly.Along the way, Xiao Mi and Hao Jinyang whispered in the back row, while Cheng Bin and Yu Renjie were silent in the front row.

When it was time at X University, Hao Jinyang remembered that the commemorative coins that should be returned were still locked in his drawer, and he couldn't help but beat his chest. Xiao Mi suggested that he send it by courier another day, but he was afraid that the courier would lose it, so he decided to deliver it himself once.

This time they asked the director of the Academic Affairs Office to contact Tian, ​​the dean of the Department of Chemistry. I don’t know if it has something to do with the toxicity of the chemistry major. Director Tian’s complexion is obviously not as rosy as Director Chen’s. Not only is his face pale, but he is also bald The head and forehead are shining brightly under the light, which has the meaning of the brilliance of a great man.

The walls of the chemical courtyard building are pure white, and after a long time, some cracks and gray.Numerous round and square pipes were laid outside the building, and a huge chimney towered outside, but there was no smoke coming out of it.This building gives people a contradictory sense of time and space. It is as old as a product of the last century, but it also gives people a tough high-tech feeling.

Before approaching, he heard a pungent smell. Cheng Bin asked what it was, and Director Tian replied with a wry smile that it was a mixture of many chemicals.Before entering the building, Cheng Bin handed Yu Renjie a medical mask. Yu Renjie waved his hand and said no, so Cheng Bin stiffened his arms, put on a straight face, and lowered his head to put it on for himself.

The chemical laboratory building has a total of six floors. Except for the first floor, where there are only offices for administrative staff and security personnel, the other floors are mainly laboratories. Only one or two staff offices and project team activity rooms are reserved at the end of the corridor.Teachers of the departments work in the staff office; doctoral students, postgraduates and undergraduates participating in projects use the activity room as their base, where they search for information, write papers, or simply use the computer.When the teacher is not around, the atmosphere inside is very relaxed.

Director Tian was more pragmatic. Instead of showing them around in the chemistry building, he took them directly to the third floor, the office of the inorganic experiment group.Only the experimental group of Mr. Jiang Xuesong in the hospital will use thallium-containing reagents, and thallium sulfate will be used as the electrode source in the experiment for electrochemical experiments.

Teacher Jiang explained the whole process and principle of the experiment to them, during which the members of the second team were all yawning, only Hao Jinyang kept nodding there.Later, Xiao Mi asked him how he understood in private, and he said that he didn't understand a word, but thought it was better to nod when the teacher was speaking, and Xiao Mi slapped him hard.

"Mr. Jiang, can you confirm the date of using thallium sulfate?" Cheng Bin waited patiently for him to finish explaining the chemical principles, and asked the question he was most concerned about.

"Go and call Xiaoxia in." Jiang Xuesong opened the door of the office, stopped a student in the corridor, and ordered.

After a while, Xiao Xia came. He was still wearing a lab coat and a disposable mask. There were several acne bumps on his exposed forehead, and the white lab coat was full of stains.

"Take off the mask first." Teacher Jiang said, while Xiao Xia was taking off the mask and coat awkwardly, Cheng Bin took off the mask on his own face, crumpled it up and stuffed it into his pocket.

After listening to the teacher's question, Xiao Xia rushed out of the office without looking back, and came back a minute later with a crumpled exercise book: "Mr. Jiang, the last time thallium sulfate was used on July 1, weighed It's on the record."

"Please show me." Yu Renjie stretched out his hand, and Xiao Xia obediently handed the weighing book into his hand.

The weighing book is just a soft-sided exercise book, which is sold in major stationery stores. The students draw a straight line on it and divide the page into three sections, which are date, chemical substance and dosage, and record the materials used in each experiment. use of chemicals.The cover of the notebook has been peeled off, the paper soaked in water, soaked and become brittle, the curved paper spread the notebook open, forming a thick stack.In addition, yellow, purple and other unknown liquids dried up on it, covering the students' crooked words even more blurred.

"Students in our department are not very serious when filling in this notebook. Some people often forget to fill it in, but I ask the students under me to fill it out carefully. If there is any problem with the experimental results, they can go back and check." Teacher Jiang said: " Although I also asked them to make good experimental records and reports, after all, those things are added after the fact, and the data recorded after the experiment is more accurate."

July 7 is still summer vacation, which does not match the time when Li Qianqian was poisoned. Of course, it is not ruled out that someone will hide the toxin first, and find a chance to do it after Li Qianqian returns to school.Since Li Qianqian felt unwell at the end of last semester, the prisoner may have received thallium sulfate earlier.So Cheng Bin asked: "Please sort out the usage of thallium in the last semester and this semester together. We need the most comprehensive and accurate data."

After that, they not only read the records in the weighing book, but also checked the contents of the students' experiment preview, process records and experiment reports.Mr. Jiang's electrochemistry project was successfully applied in the middle of the last semester. It has been implemented since June, and several experiments have been done one after another. It happened to be the first time Li Qianqian began to feel unwell.

Once the timing is right, the possibility that the toxin in Li Qianqian's body came from the laboratory is greatly increased.Cheng Bin followed the request to check the storage location of thallium sulfate in the laboratory and the corresponding access procedures.

Director Tian and Teacher Jiang took them to a laboratory where the smell of chemicals became stronger, with a sour and pungent smell.Teacher Jiang rubbed his nose and explained that some students may have used sulfide.Cheng Bin took out a brand new mask from his jacket pocket and stuffed it for Yu Renjie, but Yu Renjie still didn't want it.Cheng Bin stuffed the mask back again, and he brought a whole stack of masks when he went out.

There is a cabinet refrigerator at the door of the laboratory with a lock hanging on it, and the thallium sulfate powder is stored in it.Director Tian stepped over nervously, grabbed the lock, frowned and said, "Why didn't you lock it properly!"

Teacher Jiang passed him and rushed directly into the laboratory: "Who opened the dangerous goods cabinet just now? Why didn't it lock it!"

A girl with a ponytail raised her hand timidly: "It's me... I forgot... I just thought about using it for a while, and the reagent will be returned soon... I'll lock it right now!"

"This little girl is from Mr. Zhang's group. She's frizzy..." Mr. Jiang turned to Director Tian and said, before the female student ran over from the experiment table, Mr. Jiang shut up.The female student brought out the reagent bottle and the key, stuffed the reagent bottle into the cabinet, and re-locked the cabinet.

"Wait, let me take a look." Yu Renjie said, he opened the lid of the freezer, ready to poke his head in.But Teacher Jiang stopped him: "There are poisonous things inside. If there is a bottle that is not covered properly, it will easily evaporate." Yu Renjie nodded, reached into Cheng Bin's pocket and randomly grabbed a mask out, unfolded it and put it on. Standing up, he buried his head in again.

Most of the chemicals in the freezer are powder and liquid reagents that are harmful to the human body and the environment. Because they are often highly active, they are stored in the freezer at a constant temperature of about ten degrees.But the students are not very careful about the preservation of these dangerous goods. The bottles and jars are piled up in a haphazard manner, and they are not all marked. Some jars are even wrapped in opaque plastic bags, except for the students who often use it. , no one knows what's inside.

When Yu Renjie raised his face, he found that everyone was staring at him, but when he asked them, they looked away again and refused to say anything.It was not until several minutes later that Hao Jinyang whispered to him: "Brother, the mask you are wearing is the one used by the captain just now."

Yu Renjie was startled, and quickly took off the mask, wondering why the mask was so wrinkled.