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.

GASOLINE

FOOD

SOIL

WATER

WORK EXPOSURE

Lack of ConcentrationMiscarriage & InfertilityNauseaDyspepsiaAnaemiaHypertensionFatigue

DOs

Use unleaded petrol.Safely dispose Lead batteries.Take more Ca & Fe in diet.Avoid smoking.Wear gloves while soldering.

DON’Ts

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.

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