What diseases can benzene cause? Is it fatal? What is the exposure limit? ?

Due to benzene’s high volatility, it spreads easily when exposed to air. When humans and animals inhale or come into skin contact with large amounts of benzene, it can cause acute and chronic benzene poisoning. Some studies have shown that part of the cause of benzene poisoning is the formation of phenol in the body from benzene. Benzene has a paralyzing effect on the central nervous system, causing acute poisoning. In severe cases, symptoms such as headache, nausea, vomiting, confusion, loss of sensation, coma, and seizures may occur; in the most serious instances, death can result from paralysis of the central nervous system. Even small amounts of benzene can cause drowsiness, dizziness, an increased heart rate, headaches, tremors, confusion, and loss of consciousness. Consuming foods containing excessive amounts of benzene can cause symptoms such as vomiting, stomach pain, dizziness, insomnia, seizures, an increased heart rate, and even death. Inhaling benzene vapor at 20,000 ppm for 5-10 minutes can be fatal. Prolonged exposure to benzene can cause severe damage to the blood and lead to chronic poisoning. It causes neurasthenia syndrome. Benzene can damage the bone marrow, reducing the numbers of red blood cells, white blood cells, and platelets, as well as causing chromosomal abnormalities, which can lead to leukemia or even aplastic anemia. Benzene can cause severe bleeding, thereby suppressing the function of the immune system and allowing diseases to take hold. Some studies have indicated that the incubation period for benzene in the body can be as long as 12–15 years. When women inhale excessive amounts of benzene, it can cause irregular menstruation that lasts for months, and their ovaries may shrink. The effects on fetal development and male fertility are not yet clear. When pregnant animals are exposed to benzene, it leads to low birth weight in the offspring, delayed bone development, and bone marrow damage. It is irritating to the skin and mucous membranes. The International Agency for Research on Cancer (IARC) has classified it as a carcinogen. Exposure limits: * China MAC 40 mg/m3 (dermal) * USA ACGIH 10 ppm, 32 mg/m3 TWA; OSHA 1 ppm, 3.2 mg/m3 Toxicity: * LD50: 3306 mg/kg (oral, rats) ； 48 mg/kg (dermal administration in mice) * LC50: 10,000 ppm for 7 hours (inhalation in rats). Of course, sensitivity to benzene varies from person to person due to differences in health status and exposure conditions. When the smell of benzene is detected, its concentration is around 1.5 ppm, and at this point, the risk of poisoning should be taken into consideration. During examination, the degree of benzene poisoning can be easily determined through urine and blood tests. :handshake

The information on the second floor is very detailed. In short, benzene is a highly toxic substance

This post was last edited by wsh7014 on 2013-9-17 at 19:46. The PC-TWA time-weighted average allowable concentration for benzene is 6 mg/m3; the PC-STEL short-term exposure limit is 10 mg/m3; and the IDLH immediate hazard concentration is 9800 mg/m3

US ACGIH (2002 edition) maximum benzene level: 0.5 ppm:lol:lol

The situation on the second floor is quite clear. In simple terms, it causes a decrease in the numbers of white blood cells, platelets, red blood cells, etc. It’s likely that many people working in the chemical industry will have low values in these health test results