What is hexachlorobenzene used for?
What is hexachlorobenzene used for?
Hexachlorobenzene was widely used as a pesticide to protect the seeds of onions and sorghum, wheat, and other grains against fungus until 1965. It was also used to make fireworks, ammunition, and synthetic rubber.
Is hexachlorobenzene banned in the US?
Although hexachlorobenzene has been banned in the United States since 1966 and globally under the Stockholm Convention since 2004, it is ubiquitous in the environment.
Is hexachlorobenzene still used?
6 Hexachlorobenzene. HCB was introduced as an agricultural pesticide in 1945 and was banned for agricultural purposes in the EU as of 1981. However, it is still used as an industrial chemical and is released to the environment by waste incineration.
What is the empirical formula for hexachlorobenzene?
C6Cl6
BASIC CHEMICAL AND PHYSICAL DATA
| Empirical formula: | C6Cl6 |
|---|---|
| Relative gas density: | 9.84 |
| Boiling point: | 322-326°C |
| Melting point: | 229°C |
| Vapour pressure: | 1.1 x 10-3 Pa |
What does hexachlorobenzene do to humans?
Brief exposure to very high levels of hexachlorobenzene may cause adverse effects on the nervous system such as weakness, tremors, and convulsions; skin sores; and liver and thyroid effects. Long-term exposure can cause damage to the liver and reproductive system and can cause developmental effects.
What does hexachlorobenzene look like?
HCB is a white crystalline solid that has negligible solubility in water (0.00000002 M) but sparingly soluble in organic solvents.
Is hexachlorobenzene and benzene hexachloride the same thing?
Answer: Hexachlorobenzene is a substituted compound obtained by replacing all the hydrogen atoms in benzene with chlorineatoms. On the other hand, benzene hexachloride is an addition compound formed when three moles of chlorine add on one mole of benzene under reaction conditions.
Is hexachlorobenzene a PCB?
Organochlorine Distribution and Use The three most abundant organochlorine pollutants in human serum samples are polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT), and hexachlorobenzene (HCB). The acute toxicity of dioxins and coplanar PCBs are several fold higher than the noncoplanar PCBs.
Is hexachlorobenzene and benzene hexachloride same?
Which is the source of hexachlorobenzene?
Hexachlorobenzene is currently emitted as by-product or impurity in the manufacture of several chlorinated solvents (tetrachloroethylene, trichloroethylene, carbon tetrachloride); other chlorinated compounds (vinyl chloride); and several pesticides, including pentachloronitrobenzene (PCNB), tetrachloroisophthalonitrile …
What is the difference between hexachlorobenzene and benzene hexachloride?
Is pentachlorophenol banned in the US?
The US National Toxicology Program lists pentachlorophenol as a “reasonably anticipated” human carcinogen. The chemical is banned under the United Nation’s Stockholm Convention on Persistent Organic Pollutants, a treaty the US signed but never ratified.