Veteran new police officer

The reason why the "sewage poison testing" must be kept secret is not only for the investigation of the case, but more importantly, because it is not sure whether the Environmental Monitoring Center has mastered this "black technology".

Xiao Yunbo initially planned to find connections to contact the anti-drug department with detection capabilities in this area, and planned to arrange for personnel to go there and study.

But the detachment does not have talents in this field. Even if there are talents in this field, it will be useless without relevant instruments and equipment after returning from school.

I also thought about asking an expert to provide guidance, but doing so would not only cost money, but in a sense it would also distrust the testing capabilities of the Ecological Environment Bureau. After much deliberation, we could only ask engineers from the Environmental Monitoring Center to fumble around.

When combat effectiveness is formed and results are achieved, not only do we no longer need to keep it secret, but we can also hold a sign-up ceremony for the "Binjiang City Drug and Wastewater Monitoring Laboratory" and invite city leaders and bureau leaders to unveil the name of the Environmental Monitoring Center.

You can even apply for some funds to subsidize the Bureau of Ecology and Environment. After all, this is not within their scope of work, and testing requires investment of human and financial resources...

In short, in view of Xu Haoran's relationship with the Anti-Narcotics Brigade of Chonggang Branch, this matter must be kept secret from him at this stage.

And letting Han Xin and Hou Wen participate in the whole process is not only to use this "black technology" to find out whether there are hidden drug addicts or even drug dealers in Xingdong, but also to take this opportunity to learn how to take samples, because once combat effectiveness is formed, they must Promote it citywide.

The two transformed into temporary workers at the Environmental Monitoring Center, wearing yellow vests with the words "Environmental Monitoring" on them. Together with Wang Gong and others, they rushed to the Xingdong Ecological Environment Bureau to study Xingdong's sewage pipe network.

This information cannot be found online. Hou Wen took this opportunity to copy a copy from someone else so that he could draw a sewage drug monitoring map of the city when he returned.

After studying the sewage pipe network and identifying twenty-seven sampling points, everyone, accompanied by staff from the Xingdong Ecological Environment Bureau, began to collect water samples one by one.

Open the sewage manhole cover and fill it with bottles.

The so-called sewage is the feces flushed down the toilet. It is not very sticky after fermentation in the septic tank, but the smell is still unpleasant.

Fortunately, we were prepared in advance and had masks, gloves and other protective equipment.

What surprised the two was that the sampling procedures of the Bureau of Ecology and Environment were as professional as the police evidence collection.

As soon as you arrive at the sampling point, turn on the law enforcement recorder and film the entire process from collecting water, letting it sit, dividing samples, loading it into a refrigerator, and affixing seals.

At the same time, use the APP camera function on your mobile phone to take pictures of the on-site environment, and also fill in the sampling site environment record, such as the description of the surrounding environment, weather conditions, water color, and whether there are other sewage outlets, stagnant water areas, backwater areas, and residential areas around it. , industrial areas and areas where pesticides and fertilizers are used, etc.

At twelve o'clock in the city, the samples were taken in half a day.

I sent the collected water samples to the refrigerated truck sent by the monitoring center, had a meal with the Xingdong Ecological Environment Bureau, and then went to the riverside to collect samples.

At the Xingdong Ecological Environment Bureau in the morning, Han Xin was embarrassed to ask.

Seeing the Xingdong man in the car behind, Han Xin couldn't help but ask: "Wang Gong, what do you want to pick up from the riverside?"

Gong Wang actually admired his determination and said with a bit of embarrassment: "Team Han, we have our own job. Since we have come to Xingdong, we can't just collect the water samples you need, but we must also collect the water samples we need." Monitored.”

Hou Wen reacted: "Wang Gong, are you talking about checking whether anyone is illegally discharging sewage into the river?"

“It’s not just about monitoring whether companies and individuals are illegally discharging sewage, but also about monitoring water quality.”

Seeing that the two people seemed to understand, Wang Gong explained in detail: "There are twenty testing indicators for river sections, such as potassium permanganate index, chemical oxygen demand, five-day biochemical oxygen demand, ammonia nitrogen, total phosphorus, and total nitrogen. , copper, zinc, fluoride, selenium, arsenic, mercury, etc.

The monitoring indicators of the control section entering the sea should include nitrate nitrogen and nitrite nitrogen.

Just like you deal with drug dealers every day, we mainly deal with water. Surface water, underground water, clean water, sewage, river water, river water, and sea water are all within our monitoring scope. "

It’s like a mountain apart!

If it were not for the "sewage poison testing", who would know that there are many top students like him who graduated from 985 or 211, staring at the city's water in obscurity.

Han Xin was eye-opening. After thinking about it, she asked again: "What about the air? Is there someone dedicated to monitoring the air?"

"Yes, there are more people responsible for atmospheric monitoring than us."

Talking about this, Wang Gong took out his mobile phone and clicked on the work group: "There are more than 400 automatic air quality monitoring stations in the city. In the morning, the central computer room found that the data of a monitoring station in Sigang was suddenly missing, and the data of the entire site was blank. Our colleagues have already passed by, and we don’t know if they have repaired it.”

Han Xin asked curiously: "Is it urgent?"

"Of course it's urgent. We monitor each district and county, the province monitors us, and the capital monitors each province and city. The time left for us to repair is only four hours, because if the data of a site in a day is missing for more than four hours, the data of this day will be lost. It cannot be used for evaluation.”

"If there is no data for more than four hours, will the superiors hold you accountable?"

"If it is man-made, we must be held accountable. The missing data at the Si Gang site is because that area is undergoing power grid transformation and we were not notified before. Although it is not our problem, we still need to report it clearly to our superiors."

Wang Gong put down his mobile phone and said helplessly: "Today's data must be gone. My colleague said that the power has just been turned on, but the instrument needs to be preheated to restart, quality control inspection, calibration and debugging, at least two Hour."

In the past, I only heard people say that environmental protection is becoming more and more strict, but I didn't have an intuitive impression of how strict it is.

Only at this moment did Han Xin know that the environmental protection industry was not easy to work in.

Just as he was lamenting that the lines were separated by mountains, Hou Wen actually asked with a smile: "Wang Gong, since we can detect the presence of drugs in sewage, can we detect it in the air?"

Wang Gong didn't expect his imagination to be so big, and couldn't help laughing: "Most of the drugs nowadays seem to be chemicals. The air only contains chemical components, which can theoretically be detected. But the air is flowing, and it is difficult to trace the source. Even if Even if it can be detected, it will be of no use to you.”

Hou Wen nodded: "That's right, sewage testing is reliable."

Han Xin asked with a smile: "Wang Gong, does the sewage we collected today contain drugs? How many days will it take you to detect it?"

"If we only detect the chemical components, we can detect them at noon tomorrow. But there are so many new synthetic drugs, and even cold medicines contain ephedrine, which means that we not only have to detect the chemical components contained, but also various kinds of drugs. The content of chemical components can be compared and distinguished.”

"Can't you get up soon?"

"The main reason is that there is no standard or reference. Give me three days. I will do a few more experiments, study and analyze the relevant data, and make repeated comparisons."

For fear that the two policemen would think that he was not taking it seriously, Mr. Wang emphasized: "There is no rush. After I go back, I will pre-process the collected water samples to remove as many impurities as possible, and then concentrate and concentrate the water samples." Nitrogen blow.

Take a sample of a mineral water bottle, filter 50 ml of it, and pass it through a solid-phase extraction column to extract the target substance. The solid-phase extraction column is filled with some special packing. When the sewage passes through that column, the drugs are extracted. will be adsorbed on the filler.

The drug is then washed away from the packing through a series of solvent elutions. Then blow dry at low temperature with high-purity nitrogen, then redissolve with 0.2 ml of solvent, and finally concentrate the 50 ml target water sample into 0.2 ml of sample. "

Han Xin didn't expect it to be so complicated. She felt that Wang Gong was a legendary scientist!

Hou Wenwen was a top student. Although he didn't understand the principle, he had a rough understanding of the experimental process and subconsciously asked: "We need to concentrate the water sample two hundred and fifty times!"

"Almost, it must be concentrated at least two hundred and fifty times."

Wang Gong smiled and continued: "After the concentration is completed, the instrument analysis is carried out. You don't understand how to analyze it. Let me give you a simple analogy. The last 0.2 ml sample must contain a variety of chemical composition.

Just like picking beans, we must first select a few beans containing drugs from the many chemical components, break them into pieces, and determine whether the drug components in them are heroin or methamphetamine. In this way, we must first establish a standard database.

Then smash all the beans that were picked out one by one, and compare them with the previous standard beans. Only when the inside and outside are completely the same can we be sure that they are drugs. All in all, we have to first establish a standard ourselves through trial and error. "

He seemed to have said in the morning that each place has different inspection standards due to different environments.

Not to mention that there is no national standard, even if it is, it cannot be used when it is brought to Binjiang. This is similar to the reason why drug-detection dogs trained by Nanyun may not be able to find drugs when they come to Binjiang.

Han Xin realized what it means that everything is difficult at the beginning, and asked with a smile: "Wang Gong, so once we get on the right track, the detection will be faster in the future?"

"Um."

"So we can take samples ourselves in the future. Just like sending biological test materials to the Criminal Technology Center for identification, we can just send them to you for testing."

"Water samples cannot be contaminated, and the sampling process is also very important."

Hou Wenwen originally participated with this task, and immediately took over the conversation: "Wang Gong, when I go back, I will refer to your sampling process today and draft a set of our sampling specifications. Please help us take a look at it, if you can If so, we will take samples and submit them for inspection in accordance with the regulations.”

Thinking that the police were very particular about collecting evidence, Wang Gong smiled and said, "No problem, I'll give you an email later."

In the past, collecting and sorting out drug information relied entirely on interrogating several suspects during case handling.

If this "black technology" is reliable and can be promoted, we can have a good idea of ​​the drug situation in the city. This is true technical and control intelligence!

The more Han Xin thought about it, the more excited she became. She couldn't help but smile and said: "Wang Gong, our Xiao branch will definitely organize sampling and inspection training when the time comes, and we will definitely ask you to give us a good talk."

Hou Wenshen agreed: "There is no tuition fee for asking others to give lectures, but there will definitely be fees for asking you to give lectures!"