cause
1. Benzene is volatile, flammable and explosive. Its boiling point is 80℃ and it is liquid at room temperature. Toluene and xylene are homologues of benzene, which are often collectively referred to as "triphenyl" in industry. Of these three substances, benzene is the most toxic.
2. Benzene belongs to the list of Class I carcinogens, while toluene and xylene belong to the list of Class III carcinogens.
Extended data
First, the harm of benzene
(1) Because of its high volatility, benzene easily diffuses when exposed to air.
(2) Inhalation or skin contact of a large amount of benzene by humans and animals can cause acute and chronic benzene poisoning.
(3) Long-term inhalation will harm people's nervous system, and acute poisoning will lead to nerve spasm and even coma and death.
(4) A large number of leukemia patients have a history of exposure to benzene and its organic products.
Second, the harm of toluene
(1) Health hazard: irritating to skin and mucosa, and anesthetic to central nervous system.
(2) Acute poisoning: Inhalation of high concentration of this product in a short time can cause obvious irritation to eyes and upper respiratory tract, congestion of conjunctiva and pharynx, dizziness, headache, nausea, vomiting, chest tightness, weakness of limbs, stumbling gait and confusion. In severe cases, restlessness, convulsions and coma may occur.
(3) Chronic poisoning: neurasthenia syndrome, hepatomegaly and abnormal menstruation of female workers may occur after long-term exposure. Dry skin, chapped skin, dermatitis.
(4) Environmental hazard: it is serious to the environment and can pollute the air, water environment and water source.
(5) Explosion hazard: This product is flammable and irritating.
Third, the harm of xylene
(1) Xylene can irritate eyes and upper respiratory tract, and can anesthetize central system at high concentration.
(2) Acute poisoning: Inhalation of higher concentration of this product in a short time may lead to poisoning.
(3) Chronic effects: Long-term exposure to neurasthenia syndrome may lead to abnormal menstruation in women. Skin contact often leads to dry skin, chapped skin and dermatitis.
References:
Baidu encyclopedia-benzene
Baidu encyclopedia-toluene
Baidu encyclopedia-xylene