Dispersion+Dilution+Biomagnification+LD50+DDT and Pollutants + Leachate and Groundwater

Question 1

What is LD50

Answer 1

LD50 stand for lethal dose. It’s the amount of substance that causes 50% of animals to die if they are given a specific dose all at once.

Question 2

What is dispersion?

Answer 2

Dispersion is the scattering of a substance away from it’s source. Like spreading fertilizer on your lawn.

Question 3

What is dilution?

Answer 3

Dilution is when you reduce the concentration of a pollutant by mixing it the pollutant with large quantities of air and water. Like putting one drop of bleach into a sink full of water.

Question 4

What is biomagnification?

Answer 4

Biomagnification is the increase of a concentration of a chemical or element as it moves up the food chain.

Question 5

What is DDT?

Answer 5

DDT is a common element that biomagnifies, and it was a pesticide that was used in the 1940’s and 50’s. DDT travels up through the food chain and increases in concentration.

Question 6

What is groundwater?

Answer 6

Water from rainfalls sinks into the soil and through two zones. Which are;
Aeration zones-Where both air and water are in the soil.
Groundwater zone-This the soil where there is only water.
The boundary between the two zones is called Water Table.

Question 7

What is leachate?

Answer 7

Leachate is when water soaking the soil, and moving downwards dissolves the substance in the soil and carries it along.
For ex; Pollutants from contaminated, soil leach into the groundwater. Leaching at a Landfill.

Question 8

What is Photolysis?

Answer 8

The breakdown of compounds by light.

For ex; photodegradable plastic, it won’t work if it’s buried.

Question 9

What is the rate of biodegradation?

Answer 9

1. Temperature
2. Soil Moisture
3. Soil Ph
4. Oxygen Supply
5. Nutrient Availability
6. Planting Vegetation