Pollution - Heavy metals

A Level Environmental Science Revision

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Last updated: April 22, 2025

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First submitted	April 22, 2025
Times taken	12
Average score	8.3%
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Hint	Answer
Pb	Lead
Hg	Mercury
Fe	Iron
Cd	Cadmium
Sn	Tin
SAY LEAD YAY	LEAD YAY
Pb sources	Batteries
Pb sources	Pipes
Pb sources	Paints
Pb sources	Fishing weight
Pb sources	Shotgun pellets
Pb sources	Industrial sources
Pb effects	Inhaled
Pb effects	Absorbed through skin
Pb effects	Brain damage
Pb effects	Paralysis
Pb effects	Liver and kidney failure
Pb controls	Working practices
For example (2)	Masks, sprays
For example (2)	Alternative materials
For example (2)	Phosphorous acid insolubale layer in pipes
For example (2)	Anti knock petrol additives
UK piping ...	Replaced in 20th century
SAY MERCURY YAY	MERCURY YAY
Hg sources	Batteries
Hg sources	Thermometers
Hg sources	Fluroescent lights
Hg sources	Chlorine chemical plants using mercury electrodes
Effect severity ...	Depends on chemical form
Liquid	Not easily absorbed
Inorganic HgO	Absorbed in gut
Organic methyl mercury	Absorbed through skin and gut
Hg effects	Neurotoxin
Hg effects	Liposoluble
Hg effects	Crosses blood-brain barrier
Hg effects	Crosses placenta
Hg effects	Methyl mercury B+B
A fish eating bird has __x orginial	49 million
Hg controls	Restrictions
Hg controls	Electronic thermometers
Hg controls	Removed from effluents
Methods	Reverse osmosis
Methods	Activated carbon filter
Methods	Ion exchange
SAY IRON YAY	IRON YAY
Fe sources	Spoil heap leachate
Fe effects	Oxidised in rivers
Fe effects	Sedimentation
Fe effects	Deoxygenation
Fe effects	Death of aerobic organisms
Fe Controls	Mesh screens precipitate iron oxide
SAY CADMIUM YAY	CADMIUM YAY
Cd sources	Nickel-cadmium batteries
Cd sources	Incineration
Cd sources	Mine drainage
Cd effects	Lipsoluble
Cd effects	B+B
Cd effects	Brain damage
Cd effects	Paralysis
Cd effects	Lung cancer
Cd effects	Skeletal collapse by bone decalcification
Cd effects	Synergy with Zinc
Cd controls	Bans
Cd controls	Restrictions
SAY TIN YAY	TIN YAY
Sn sources	Toxic tributyl tin
Sn sources	Anti-fouling paint
Purpose	Prevent marine growth on ships
SN effects	Endocrine disruptor
SN effects	B+B in shelfish
SN effects	Prohibited
SN effects	Chemical waste landfill sites

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