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The chemicals in the waste water of harmful Formosa like?

01-07-2016 - 22:33 - 946 lượt xem

Cyanide is one of three toxins in the water discharge cause mass death in central Vietnam. 50-200 mg substances enter through the mouth can kill people.

More than 100 experts and leading scientists from 30 domestic and foreign agencies have organized to collect, analyze data and identify the source of the waste water Iron and Steel Co., Ltd. Hung Nghiep Formosa Ha Tinh (FHS) have Phenol toxin, cyanide, iron hydroxide exceeding the permitted level. These are poisons cause mass death in four central provinces of Vietnam.
The chemicals in toxic wastewater from Formosa like? Image 1
Fish die-off in four central provinces of Vietnam due to intoxication. Photo: Quang Dien.
According to the Chemical Research Australia (NPI), phenol is a relatively inexpensive organic materials, commonly used in manufacturing industries such as plastics, rubber products, pharmaceutical, paint ...
It is produced in large quantities, mainly as an intermediate in the manufacture of other chemicals such as caprolactam, used as nylon, synthetic fibers, and bisphenol A, epoxy and resin used.
Phenol can be toxic to fish, birds, animals, reduced life expectancy, fertility. Unlike some other toxins emitted by industries such as heavy metals, phenols do not accumulate in the human body which is broken down relatively quickly. There are data showing industrial workers exposed to phenol as manufacturing tires and rubber products are more likely to develop cardiovascular disease than normal.
Phenol is toxic to the human body through the digestive, skin absorption. Phenol poisoning symptoms are shortness of breath, reduced body temperature, cyanosis, muscle weakness, rapid pulse, coma. When respiratory failure can lead to death.
According to the Australian National Regulations, phenol content allows a maximum of seawater is 5 mg / liter of water.
Like phenol, cyanide is a chemical used in manufacturing industries such as iron and steel, chemical industry and sewage treatment. cyanide and cyanide compounds is one of the components of pesticides, plastics, electroplating and mining.
According to the International Institute for Management cyanide (ICMI), fish and other aquatic animals are particularly sensitive to cyanide. Concentrations of free cyanide in water ranging from 5 to 7.2 mg / per liter of water, reduces performance and inhibit reproduction swimming in fish. From 20-76 mg / liter of water, which can cause many fish died, concentrations exceed 200 mg per liter is toxic to all species.
Humans can be exposed to low concentrations of cyanide in daily life from food, medicine ... Eating or drinking foods containing cyanide can cause health effects. With large doses, can cause cyanide poisoning.
Initial symptoms usually include headache, dizziness, drowsiness, weak pulse, rapid breathing, red face, nausea and vomiting. Worse may happen convulsions, dilated pupils, slow heart rate, body temperature drops, passion and death today.
Prof. Nguyen Duy Thinh, staff of the Institute of Biotechnology - Food Technology, Hanoi University of Technology, said cyanide is extremely toxic substances, dangerous and most difficult to handle. Even just about 50-200 mg oral penetration cyanide can poison killed a healthy person.
"Acute cyanide is toxic, as well as chronic toxicity. Depending on the content, they can cause immediate reactions or accumulate inside the human body when we are exposed to. In fact, people tend to use this chemical to poison by trendy effects, "Thinh said Assoc.
ferric hydroxide
According to Professor Tran Hong Con, lecturer in Chemistry University of Natural Hanoi, this is the consequence of the discharge of seawater out of iron. It takes oxygen from the water quality variables, oxidized ferric iron, then the moisture content of iron oxide slurry. They can absorb some of the toxic substances contained in waste water, bring to the place far from over, then settled into the seabed causing harmful secondary effects.
However, iron is not toxic substances should not affect the bath or in any activity of the human sea.
According to experts, in addition to the chemical 3, in the production process, the plant discharged Formosa certainly other heavy metals. Therefore, it should be transparent about the content, the level to be able to assess the damage and provide solutions.
Phuong Mai - Ha Quyen

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