Hexachlorobenzene (C6 Cl6 ) is a highly toxic, persistent chlorinated hydrocarbon, formerly used widely as an agricultural fungicide (especially for wheat bunt) until banned in many regions by the 1980s. It exists as a white crystalline solid that bioaccumulates in fatty tissues, causing serious health issues like porphyria, and is classified as a probable human carcinogen.
Key Aspects of Hexachlorobenzene:• Uses (Historical): Primarily a fungicide for seed treatment
(wheat), and historically in industrial processes like rubber, dye,
and aluminum production.• Environmental Impact: Highly persistent in the environment
and bioaccumulative in the food chain. It is a global pollutant
found in air, water, and soil, often as a by-product of industrial
processes (like chlorinated solvent production).• Health Effects: Exposure, particularly through contaminated
food, can lead to porphyria cutanea tarda (skin
lesions/disorders), damage to the liver and thyroid, and it is a
known animal carcinogen.• Physical Properties: White crystalline solid, dense (sinks in
water), low solubility in water, and high solubility in fats
(lipophilic). It is not currently manufactured for commercial use
in the U.S. and its use is strictly controlled under international
agreements, such as the Stockholm Convention on Persistent
Organic Pollutants, due to its toxicity.