What exactly is chlorobenzene?
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, where the heaviest pollution is chlorobenzene, which exceeds the concentration in groundwater and soil by 94,799 times and 78,899 times, carbon tetrachloride concentration exceeds the standard also There are 22,699 times, other dichlorobenzene, trichloromethane, total xylenes and permanganate index exceeded the standard by thousands of times. In the text repeatedly mentioned chlorobenzene in the end what is the thing?
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 human body and the environment?
1, chlorobenzene on human health hazards include: inhibitory and anesthetic effects on the central nervous system, irritation of the skin and mucous membranes; 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 quickly “recover”; 3, the risk of combustion and explosion: the product is flammable and irritating.
Symptoms of chlorobenzene poisoning acute poisoning with chlorobenzene is 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, and repeated exposure can lead to erythema or mild superficial necrosis of the skin.
Chronic chlorobenzene poisoning is manifested as: eye pain, lacrimation, conjunctival congestion, early headache, insomnia, memory loss and other neurological symptoms, serious toxic hepatitis, individual can lead to kidney damage.
Can chlorobenzene cause leukemia?
Chlorobenzene is a compound formed when a hydrogen of benzene is replaced by a chlorine atom. Professor Yang Xu, director of the Indoor Environment and Health Branch of the Chinese Society of Environmental Science, said that benzene is a pollutant identified by the World Health Organization as causing leukemia, but only for people with sensitive constitutions; the poison caused by benzene inhalation in the air is greater than that in water, and the difference is 100:1. ” is for people with sensitive constitutions. 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 toxicity, such as washing hands with benzene to wash off paint.