Which heavy metal is known to be absorbed poorly by activated charcoal?

Activated charcoal is a well-known treatment for various types of poisonings and overdoses because it binds to many substances in the gastrointestinal tract, preventing their absorption into the body. However, its efficacy can vary depending on the specific substance involved.

In the case of heavy metals, lead is known to be absorbed poorly by activated charcoal. This is due to the fact that lead tends to have a higher affinity for binding to proteins and other cellular components rather than to activated charcoal. Additionally, lead ions are not effectively adsorbed by activated charcoal, reducing the effectiveness of activated charcoal as a treatment for lead poisoning.

On the other hand, some of the other metals listed are more readily adsorbed by activated charcoal. Aluminum, copper, and zinc, while they may also present challenges in terms of toxicity, are typically bound more effectively by activated charcoal than lead. Therefore, understanding the unique interaction of lead with activated charcoal is crucial in the management of lead exposure or poisoning, highlighting why lead is the correct answer to this question.