lead pollution
TRANSCRIPT
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6500 BC. - Lead discovered in Turkey, first mine.
500 BC-300 AD.- Roman lead smelting produces dangerous emissions.
100 BC. - Greek physicians give clinical description of lead poisoning.
1854 - Tetraethyl lead discovered by German chemist.
1921 - Midgley discovers that tetraethyl lead curbs engine knock.
Half-life Of Lead - 25 DAYS:BLOOD. 40 DAYS:SOFT TISSUE. 20 YEARS:BONE
Lead can be inhaled.
Tetraethyl lead can be absorbed via skin.
Cigarettes are the major source of Lead.
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GASOLINE
FOOD
SOIL
WATER
WORK EXPOSURE
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Lack of ConcentrationMiscarriage & InfertilityNauseaDyspepsiaAnaemiaHypertensionFatigue
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DOs
Use unleaded petrol.Safely dispose Lead batteries.Take more Ca & Fe in diet.Avoid smoking.Wear gloves while soldering.
DON’Ts
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Acknowledgement
We would like to thank our teachers for allowing us to make this project.It helped us to acquire a lot of information of the topic, without which we would have remained in the dark about such serious threats to ourselves and our environment.
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Bibliography
The following sites and books were helpful in the completion of the project:-
NCERT Biology for Class XII
www.google.com
www.wikipedia.org