2.2. Sediment-Water System

Try these first

1. 1.

   What is a D-NAPL?

   Hint

   Consider its density relative to water.

2. 2.

   What happens to L-NAPLs when spilled?

   Hint

   Reflect on their property of being less dense than water.

3. 3.

   What is the main difference between D-NAPL and L-NAPL?

   • D-NAPL is denser than water
   • L-NAPL is denser than water
   • Both float

   Hint

   Remember which type sinks and which type floats.

4. 4.

   True or False: Historical contamination can impact current environmental health.

   • True
   • False

   Hint

   Consider the lasting effects of past actions on the environment.

5. 5.

   Calculate the expected concentration of a D-NAPL at the sediment-water interface if its initial concentration in sediment is 100 mg/kg, given a constant mass transfer coefficient.

   Hint

   Remember to consider both dissolution and the nature of concentration gradients.

6. 6.

   Evaluate the impact of historical contamination on current freshwater ecosystems by analyzing a case study.

   Hint

   Think about how pollutants can be transferred through the food chain.