FOR ZOOLOGY 1ST SEMESTER. ENVIRONMENTAL TOXICOLOGY.

7. It is a heavy metal with a long history of industrial
and personal use—and just as long of a history of
harming human health. It has actually been recorded
to be harmful as early as 2,000 BC!
Lead
Lead is found naturally in the
earth, but just because it’s
natural chemical elements
doesn’t mean it’s harmless.

8. Asbestos
Despite everything we know about its toxicity, asbestos
continues to be used in items like roofing materials and disc
brake pads. If asbestos-containing materials such as
insulation, flooring, and ceiling tiles become old and flake,
then the asbestos fibers can become airborne and breathable.

9. Bisphenols are widely-used chemicals found
in everything from food and beverage can
linings to thermal paper and used to make
polycarbonate plastic as well as epoxy resins.
Bisphenols

10. Parabens
Parabens have been identified as endocrine
disruptors by the Washington. They mimic the
hormones that control functions like growth and
sexual development.

11. DDT - dichloro-diphenyl-trichloroethane - was
developed as an insecticide in the 1940s, and was
widely used during World War II to combat insect-
borne diseases.
PCBs and DDT
PCBs - polychlorinated
biphenyls - are synthetic
(human-made) chemicals
first produced in the late
1920s. They were used as
cooling fluids in electrical
equipment and machinery
because of their durability
and resistance to fire.

12. It is also used as a disinfectant and as a
preservative, including in mortuaries and
medical labs. It has been identified as a
cause of leukemia and nose and throat
cancer, and linked to asthma and skin
Formaldehyde
Formaldehyde is widely
used in many consumer
products, including
building materials,
pressed wood,
cosmetics, shoe-care
products, and textiles.

14. Hexane

15. Hexavalent Chromium
A legacy pollutant that can contaminate soil and
water supplies for decades, hexavalent chromium is
a widespread contaminant at hazardous waste sites
and in drinking water.

18. NMP (N-Methylpyrrolidone)

19. Styrene
This petroleum by-product is used to make Styrofoam,
plastics, rubber, and resins. It can put people at increased
risk for cancer and other diseases.

22. REFERENCE
Environmental ecology-M. C. DAS.
Environmental ecology- P. D. SHARMA.
By internet.