6. Historical Contamination in Sediments

Try these first

1. 1.

   What is diffusion?

   Hint

   Think about where molecules prefer to move.

2. 2.

   What is advection?

   Hint

   Consider movements caused by a current or wind.

3. 3.

   Which mechanism primarily drives mass transfer in sediments?

   • Advection
   • Diffusion
   • Convection

   Hint

   Remember, diffusion is about concentration differences.

4. 4.

   True or False: Advection always dominates in water systems.

   • True
   • False

   Hint

   Think about slow-moving environments.

5. 5.

   Given a scenario where pollutants were released into a deep lake, analyze their transport over a decade. What will affect their dispersion?

   Hint

   Consider both physical movement and chemical interactions.

6. 6.

   Design an experimental setup to measure the diffusion rate of a contaminant in sediments. What factors will you need to consider?

   Hint

   Think about how you would isolate variables in your experiment.