Since the end of 2015, many students at a school have been experiencing adverse reactions and illnesses, with 493 people showing abnormal symptoms such as dermatitis, eczema, bronchitis, abnormal blood indicators and leukopenia, and individuals have been detected with malignant diseases such as lymphoma and leukemia. The parents of the students suspect that the contaminated land next to the chemical plant is related to the contaminated land, which is only one way away from the school and was the site of three chemical plants. Environmental test results show that the groundwater and soil concentrations of chlorobenzene exceeded the standard by 94,799 times and 78,899 times, respectively, and experts say the school district is contaminated with pollutants that coincide with the chemical plant site. The school was deeply affected by the “toxic land”, who should be responsible for those poisoned children? According to CCTV, in a project environmental impact report, this site soil, groundwater to chlorobenzene, carbon tetrachloride and other organic pollutants, naphthalene, indene pyrene and other polycyclic aromatic hydrocarbons, as well as metal mercury, lead, cadmium and other heavy metal pollutants, generally exceeded serious standards, which is the heaviest pollution is chlorobenzene, it is in the groundwater and soil concentration exceeded the standard of 94,799 times and 78899 times, carbon tetrachloride concentration exceeds the standard also 22699 times, other dichlorobenzene, trichloromethane, total xylene and permanganate index exceeds the standard also thousands of times. In the text repeatedly mentioned in the chlorobenzene in the end what is it? Baidu said: chlorobenzene is a colorless liquid, boiling point 132.2 ℃. During World War I, it was mainly used to produce picric acid for military explosives. 1940 to 1960, it was used in large quantities to produce DDT (DDT) insecticide. 1960, DDT was gradually replaced by other pesticides with high efficiency and low residual toxicity, and the demand for chlorobenzene was decreasing. The light industry uses chlorobenzene to manufacture dry detergent and quick-drying ink, chemical production of chlorobenzene as a solvent and heat transfer medium. It also has many aliases, you will see such as phenyl chloride, chlorobenzene, chlorinated benzene, a chlorobenzene these words should be all this is chlorobenzene. Chlorobenzene is relatively stable chemical properties, at room temperature is not easily affected by air and light, a long time boiling is dechlorinated. Chlorobenzene is flammable, irritating, in contact with open flame, high heat or with oxidizing agents, there is a risk of combustion and explosion, and its explosive combustion products contain toxic hydrogen chloride. Chlorobenzene reacts violently with silver perchlorate, dimethyl sulfoxide, etc. What are the hazards of chlorobenzene to humans and the environment 1, chlorobenzene on human health hazards include: the central nervous system inhibitory and anesthetic effects, skin and mucous membranes have an irritating effect. 2, chlorobenzene has a greater harm to the environment, the water, soil and atmosphere can cause pollution. However, because chlorobenzene is very volatile, chlorobenzene in water and soil will quickly evaporate into the air, so the concentration of chlorobenzene in water and soil will quickly drop to very low levels. The concentration of chlorobenzene in the air decreases by 50% within 20 hours, and chlorobenzene in water can undergo hydrolysis reactions. Therefore, the water and soil contaminated by chlorobenzene can “recover” relatively quickly. 3.Flame and explosion hazards: the product is flammable and irritating. Symptoms of chlorobenzene poisoning acute poisoning of chlorobenzene manifested as: exposure to high concentrations of chlorobenzene can cause symptoms of anesthesia, serious cases can be coma. After getting off the scene and actively treating, you can recover quickly, but you will still have headache, dizziness, weakness, loss of appetite and other symptoms within a few days. Chlorobenzene has a mild irritating effect on the skin, repeated exposure can lead to skin erythema or mild superficial necrosis, chlorobenzene chronic poisoning manifested as: eye pain, lacrimation, conjunctival congestion, early headache, insomnia, memory loss and other neurological symptoms, serious can cause toxic hepatitis, individual can lead to kidney damage. Chlorobenzene can cause leukemia chlorobenzene is a compound formed when a hydrogen of benzene is replaced by chlorine atoms, said Professor Yang Xu, director of the Indoor Environment and Health Branch of the Chinese Academy of Environmental Sciences, said that benzene is identified by the World Health Organization as a pollutant that causes leukemia, but only for sensitive people; benzene inhalation in the air causes more poison than in water, the difference is 100:1, benzene causes leukemia “It is for sensitive people. This is the conclusion reached by UC Berkeley professor Martin Smith’s research over the past 30 years, and is the basis for the WHO’s conclusions on benzene toxicity. Benzene is extremely volatile and reaches the alveoli after being inhaled into the body. It can reach the bone marrow through the bloodstream, and long-term exposure to benzene in sensitive individuals can cause genetic mutations in hematopoietic stem cells, eventually leading to leukemia. Benzene is fat-soluble and can be absorbed through the skin in large quantities causing poisoning, such as washing hands with benzene to wash off paint.