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In page Hexachlorobenzene:

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HCB is very toxic to aquatic organisms. It may cause long term adverse effects in the aquatic environment. Therefore, release into waterways should be avoided. It is persistent in the environment. Ecological investigations have found that biomagnification up the food chain does occur. Hexachlorobenzene has a half-life in the soil of between 3 and 6 years. Risk of bioaccumulation in an aquatic species is high.[citation needed]