Question

How is inorganic mercury converted to methylmercury in the environment?

• A. Through chemical reactions in the air
• B. Through biological processes in soil and water
• C. Through volcanic activity
• D. Through industrial waste

Answer 1

Answer:

B. Through biological processes in soil and water

• Emissions of mercury to the air from both anthropogenic and natural sources are in inorganic forms that can be converted biologically to methylmercury in soil and water.

• Methylmercury bioaccumulates and enters the human body readily via the dietary route.

• Methylmercury is a potent neurotoxic chemical. Unborn children (i.e. fetuses) are the most susceptible population group, the exposure being mainly from fish in the diet of the mother.

• Methylmercury is also excreted in mothers' milk.