Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Download
Silent Killer in the Environment : Part 1
102 plays

More
This lesson deals with Part 1 of the article titled " A Silent Killer in the Environment " published in Science Reporter - December 2018

Ajay Kumar Muchakurthi is teaching live on Unacademy Plus

Ajay Kumar Muchakurthi
Appeared UPSC CSE Mains,M.A.(Public Administration), B.Tech(CSE)

U
Unacademy user
Thanks sir, plz make videos on questions of kinematics
Sir, Dont we have have any alternative to Lead or shouldnot it encouraged to go for alternative?
Alternative in the sense? Can u be a bit particular?
  1. Summary of Science Reporter - December 2018 Presented by Ajay Kumar Muchakurthi


  2. Courses: 3000+ MCQ's from Previous Papers with Analysis Analysis of Daily Current Affairs Daily Current Affairs MCQ's International Relations Summary - Yojana Summary -Science Reporter Indian Polity https://www.unacademy.com/user/ajaykumaro692


  3. A Silent Killer in the Environment: Part


  4. A Silent Killer in the Environment Human life - Exposure with different substances Many of these - Toxic : Rarely realized by the people Number of chemical substances increased - Last few decades Even unborn babies - Exposed to more than 200 commercial chemicals Number - increasing One such element - Lead


  5. Contaminates environment Enters human body Present days : Unleaded petrol But it is still used as an additive in few types of fuel Example : Aviation fuel - Used mostly in smaller, piston-engine planes


  6. Lead - Does not get destroyed even @ high temperature in combustion chambers of automobile engines Comes out as fine particles with exhaust gases Larger particles - Settle down Finer particles - Suspended in air for different durations Finally may settle down on surfaces such as soil, vegetation, buildings or on water bodies


  7. People in urban areas - Much more at risk from lead in dust Locally grown food - chance of contamination More polluted area - Contaminated with lead Important source of lead in environment - Lead-acid battery recycling facilities Old batteries are dismantled - Lead is taken out and heated To cast the metal for fresh use


  8. During this : Some lead escapes as solid, liquid and also as vapour Industries producing lead wire or pipes - Can add lead Children in vicinities of lead smelters - Recorded high levels of lead in their blood Lead contamination of soil - Due to broken-down lead paint, discarded engine oil, pesticides usage in agriculture, paint materials used in households Ageing lead paints - High levels of lead to dust and soil


  9. n in children Pica-Commo Chipped paint containing lead - Extremely dangerous Generally - People remove old paints using sandpaper- Producing dust Dust - dumped irresponsible No protective measures - Adopted by workers Painters -Suffer from lead poisoning


  10. Brightly coloured toys - High concentrations of lead Lead containing paints - To cut the cost Young children Tendency to put toys into mouth PVC pipes - Commonly used for different purposes As per a report :High percentage of P Sources of lead?? Tin used as stabilizer in PVC pipes VC pipes in India - Contains lead


  11. Cooking utensils made of metals Especially copper, brass Have high probability of being contaminated with lead Lead - Added to food items when colours are used - To make food items attractive Cheap colours - Generally metal based High probability - Lead could present


  12. Unsuspected source of lead - Imitation leather made from polyurethane Rise in cost - Imitation leather became popular Brightly coloured leather items such as Ladies' purses, bags, wallets, furniture etc., Can have lead Lead bullets used for hunting or lead fishing lures used for fishing Can contaminate flesh of animals, birds or fishes Consumption - Leads to toxicity Can also present in cosmetics