Boshan County Paper Mill.

The outside of the paper mill has been fenced off by the police.

Outside the fence was crowded with onlookers.

Most of the crowd was surrounded by residents watching the bustle, but there were also family members of missing workers.

Gu Yanan and Gu Qingcen arrived at the scene and stood outside the cordon, a faint smell of rotten eggs penetrated into their nostrils with the wind.

The toxic gases spread more widely than expected.

Gu Yanan frowned slightly, looked around, and found that there were local police guards in Boshan County in the cordon.

Gu Yanan picked up the cordon and entered the cordon, and immediately a policeman stepped forward and shouted loudly, "There is a murder here, you can't enter!" ”

Gu Yanan showed his work card, "I am from the Municipal Center for Disease Control and Prevention, and the rotten egg-smelling gas is poisonous, so we must disperse the crowd of onlookers and expand the scope of the warning belt." ”

The local police heeded Gu Yanan's advice, covered their noses, and shouted to the crowd of onlookers with a loudspeaker: "The air is poisonous, don't watch, disperse, disperse!" ”

The crowd of onlookers gradually dispersed, leaving only the families of the missing workers still waiting anxiously.

The police widened the cordon more than 10 meters outward, preventing the families of the workers from entering.

Gu Yanan and Gu Qingcen put on protective clothing and gas masks and entered the paper mill.

As soon as I entered the compound of the paper mill, I saw the county and district disease control workers who were fully armed with protective equipment carrying four corpses outside.

Lu Li and Wang Xiaoxiao, who arrived at the scene in advance, were also inside.

Wang Xiaoxiao's face was heavy, and when he saw Gu Yanan, he shook his head and sighed: "The four people have long lost signs of life, and they have already appeared dead, the forensic doctor from the police station came just now, and after the preliminary examination, it was judged that the time of death was sixteen hours, that is, around 5 o'clock yesterday evening." ”

A person in charge of the Boshan County Center for Disease Control and Prevention saw Gu Yanan and came over, "Director Gu, our county CDC received a report call in the middle of the night last night, saying that there was a suspected occupational poisoning incident in the paper mill in Boshan County, and I immediately organized people to come over, but the smell in the workshop was too big, I was worried that the staff would be poisoned, so I urgently transferred gas masks and work clothes, and observed from the beating pool, and found that the people inside had no signs of life. ”

Gu Yanan listened to the report of the county disease control and walked into the workshop.

In the workshop, at the entrance of the beating tank at one end, a blower is blowing air into it, trying to reduce the concentration of toxic gases in the pool.

Gu Qingcen took out a lead acetate test strip from the box he was carrying, and near the entrance of the pulping pool, the white test strip immediately turned black.

The lead acetate test strip is a qualitative experiment to detect hydrogen sulfide gas, and the test strip has a strong positive reaction before entering the pool, indicating that the hydrogen sulfide gas concentration in the whole workshop has been very high.

Field qualitative experiments are followed by quantitative experiments.

Gu Qingcen took out a gas sampler, pumped out the gas in the pulping pool at an average speed, collected the absorption liquid and prepared it to return to the CDC laboratory for quantitative testing.

Gu Yanan looked around the pulping pool, the pulp inside has been fermented, and it is constantly producing toxic gases, and the pulp pool must be cleaned to prevent more people from being harmed, otherwise the pulp will continue to ferment, and the pulp pool will become a "man-eating pool".

The disease control personnel decided to clean up the pulping pond, there was still 15 cm thick leftover pulp in it, after more than half a month of fermentation, the smell in the pulping pond and even the whole workshop was extremely unpleasant.

Several people discussed it and decided on a cleanup plan.

Disease control personnel wore protective clothing to clean the pulp in the pulp pool outside the workshop, and Gu Yanan took out a small part of the specimen from the pulp and prepared to take it back to the laboratory for microbial testing.

After two hours, the pulp in the pulp tank was completely cleaned, and the smell of rotten eggs in the workshop dissipated.

The families of the missing workers waiting outside the factory had already finished taking notes with the police, claimed their bodies, and dispersed.

Gu Qingcen then used lead acetate test strips to detect the hydrogen sulfide content in the air, and the white test strips did not change at all.

The harmful gases of hydrogen sulfide in the paper mill have been cleaned up.

The police removed the cordon outside the paper mill, and the on-site treatment was completed.

——

Lianhai Center for Disease Control and Prevention, Laboratory.

Several members of the city's CDC emergency team brought air and pulp samples collected at the paper mill to the lab.

The results came out quickly.

The concentration of hydrogen sulfide was detected in the air collected in the pulping pond of the paper mill at 146 milligrams per cubic meter, which exceeded the national allowable concentration by more than ten times.

This is still after the body is salvaged, the pulp in the pulp tank is stirred, and the exhaust fan is used for ventilation for a period of time, so it is speculated that when the workers went down to the pool, the concentration of hydrogen sulfide in the pool was higher.

Microbiological tests of the pulp samples revealed that they contained a high number of hydrogen sulfide-producing bacteria.

With the qualitative and quantitative experiments of hydrogen sulfide in the laboratory, according to the poisoning environment of the workers, and the support of clinical diagnosis, it was determined that the death of acute hydrogen sulfide poisoning was caused by hydrogen sulfide gas.

——

Lianhai Center for Disease Control and Prevention, Emergency Office.

Gu Yanan sorted out the data on the death of hydrogen sulfide poisoning in the paper mill and wrote a summary report.

A small paper mill in Boshan County had a large amount of surplus pulp in its pulping pond, and the mill was shut down for 21 days.

The weather is hot, and the pulp ferments, producing a large amount of hydrogen sulfide gas.

Hydrogen sulfide gas is denser than air and is deposited in the pulping tank.

The paper mill received a new order and was ready to resume work, and the maintenance worker Lao Wang entered the pulping pool during the inspection of the equipment and inhaled the harmful gas of hydrogen sulfide in the pool.

The high concentration of hydrogen sulfide caused Lao Wang to quickly fall into a coma and have an "electric shock-like death".

Zhou the director of the paper mill found that Lao Wang was missing, and brought three workers to the workshop to look for him, found Lao Wang at the bottom of the pool, and quickly went down to rescue him.

The rescuers also suffered "shock-like deaths" from inhaling hydrogen sulfide from hydrogen sulfide.

Xiao Liu, a worker who stayed at the poolside, noticed that the situation was wrong and dialed 119.

The firefighters went down to the pool, inhaled hydrogen sulfide, and quickly fell into a coma, and the firefighters at the pool found the situation and pulled out the unconscious firefighters in time.

After treatment, the firefighter and worker Xiao Liu were out of danger.

Lao Wang, Director Zhou, and two other workers who fell into the beating pond to rescue them died.

The pulping pond of the paper mill was cleaned and the concentration of hydrogen sulfide in the air was reduced to the normal standard.

After writing the summary report, Gu Yanan stood up from behind his desk, ready to move his muscles.

Gu Qingcen handed over a cup of tea to Gu Yanan in time, "The cloud tea of Yuntai Mountain has just been brewed." ”

Gu Yanan was stunned for a moment, then took it with a smile, "Thank you." ”

Gu Qingcen had two concert tickets in his pocket, which he had booked in advance according to Gu Yanan's preferences, and was ready to go with Gu Yanan this weekend.

Just as he was about to take out his concert tickets, Yanan Tani's mobile phone suddenly rang on his desk.

Gu Qingcen saw the caller ID Nan Hanfei.

Picking up the phone, Nan Hanfei's voice came, "Yanan, the red-billed firefinch we gave to Uncle Ge last time was taken away by the cat, Uncle Ge is in a bad mood, I am going to go to the flower and bird market to buy him another one this weekend, can you accompany me?" ”

"Okay, you send me the time and place of the weekend meeting." Gu Yanan happily agreed.

Gu Qingcen silently took back the concert ticket in his hand.