Heavy metal pollution

Question 1

Sources

Answer 1

Lead-lead acid batteries
mercury-batteries
cadmium-old nickel-cadmium batteries

Question 2

2 Effects

Answer 2

-Usual neurotoxin effects such as paralysis , brain damage
- deoxygenation

Question 3

2 Lead control

Answer 3

-Lead fishing weights replaced with tungsten smaller weights
-Lead water pipes replaced with solder based around zinc and copper

Question 4

1 mercury control

Answer 4

-Disposed at high ph so they are less soluble and less mobile

Question 5

1 iron control

Answer 5

-Spoil heap drainage water is collected and passed over mesh screens where iron becomes oxidised and no longer poses deoxygenation risk