Water pollution Flashcards
(5 cards)
1
Q
Water pollution
A
Bacteria feed on the organic matter in water. They use up the dissolved oxygen killing off other organisms in the water
2
Q
BOD stands for…
A
Biochemical Oxygen demand
3
Q
BOD Meaning
A
Is the amount of dissolved oxygen used up by other organisms (in ppm) when a sample of water is left in the dark at 20*C for 5 days.
4
Q
Eutrophication
A
The enrichment of water with nutrients , leading to excessive growth of algae and other plants.
5
Q
What is removed by precipitation reactions
A
Lead PB2+
Mercury Hg2+
Cadmium Cd2+
