Download - Ppt chem
Elements provides useful framework for
analyzing chemical behavior, and is widely used in
chemistry and other sciences. There are many
elements that can harm the environment and a
person’s health condition because of the toxic
substances that they contain. This presentation will
discuss about their harmful effects on the
environment and to a person’s health
Vanadium causes the inhibition of certain enzymes with animals, which has several neurological effects.
It also causes breathing disorders, paralyses and negative effects on the liver and kidneys.
Vanadium can cause harm to the reproductive system of male animals, and that it accumulates in the female placenta.
Carcinogenicity- Carbon black has been listed by
the International Agency for Research on Cancer
(IARC) within Group 3 (The agent is not classifiable
as to its carcinogenicity to humans)
Chronic inhalation exposure to
carbon black may result in temporary
or permanent damage to lungs and heart.
Skin conditions such as inflammation
of the hair follicles, and oral mucosal
lesions have also been reported from
skin exposure.
is a chemical element with symbol Tl and atomic
number 81. This soft gray poor metal is not found
free in nature.
Can cause breathing problems
The effects of Thallium are tiredness,
headaches, depressions, lack of
appetite, leg pains, hair loss and
disturbances of the sight.
Negative effects upon plants, such as
color changes in leaves and growth
declines.
Large releases of thorium may be
harmful to contaminated plants and animals.
Thorium may also be harmful when
released to aquatic places. It may
harm the species of the bodies of water.
Uranium was discovered in 1789 by Martin Klaproth,
a German chemist, in the mineral called
pitchblende. It was named after the planet Uranus,
which had been discovered eight years earlier.
Uranium is harmful both through its chemical toxicity and its radioactivity.
This principle can be used in the product of nuclear weapons which can be harmful when used militarily. There are also industrial byproducts released into the atmosphere that might threaten our health.
Uranium can break chemical bonds which are essential to the structure and function of living tissues of the organisms. And these breaks cannot be usually repaired by our body. Which can make the cells cancerous.
Polonium was the first element Marie and
Pierre Curie discovered. Polonium is the
heaviest element in the chalcogen
family. It is in Group 16 (VIA) on the
periodic table.
Polonium is harmful both through its
chemical toxicity and its radioactivity.
Exposure to polonium increases the risk
of getting various cancers.
When it breaks down, it gives off alpha
particles. These particles are tiny, atom-
sized particles that can destroy cells.
Arsenic is an element in the environment
that can be found naturally in rocks and
soil, water, air, and in plants and animals.
It can also be released into the
environment from some agricultural and
industrial sources.
It is still classified as a deadly poison. But amidst all of that it is still an essential element for some animals and even for human.
It may also affect the community near smelters, fields or orchards where arsenic pesticides where used that may contaminate the soil.
The arsenic from farming and smelting tends to bind strongly to soil and is expected to remain near the surface of the land for hundreds of years as a long-term source of exposure.
pure aluminium is a silvery-white metal with many desirable characteristics. It is light, nonmagnetic and nonsparking. It is somewhat decorative. It is easily formed, machined, and cast. Pure aluminium is soft and lacks strength, but alloys with small amounts of copper, magnesium, silicon, manganese, and other elements have very useful properties. Aluminium is an abundant element in the earth's crust, but it is not found free in nature.
Depending on the source of exposure, aluminum can be absorbed through the gastrointestinal (GI) tract or the lungs.
The consequences for birds that consume contaminated fish -eggshell thinning and chicks with low birth-weights
The consequences for animals that breathe in aluminum through air may be lung problems, weight loss and a decline in activity
Aluminum can damage the roots of trees when it is located in groundwater.
is a transuranic radioactive chemical
element that has the
symbol Am and atomic number 95.
Its isotopes decay very slowly in the
environment and as a result they can do
harm to plants and animals. When
animals are exposed to extreme levels of
americium, results may be damage to
organs such as the lungs, liver and
thyroid.
Beryllium is a Group 2 (IIA) element. It is a metal and has a high melting point. At ordinary temperatures, beryllium resists oxidation in air. Beryllium compounds are very toxic. Its ability to scratch glass is probably due to the formation of a thin layer of the oxide.
Humans add beryllium through production of metal and combustion of coal and oil.
Industrial emissions will add beryllium to air and wastewater disposals will add beryllium to water.
The uptake of beryllium has
consequences mainly for human health.
However, laboratory tests have
indicated that it is possible for beryllium
to cause cancer and changes of DNA
with animals. So far there is no field
evidence to support these findings.
some of the elements of the periodic
table are not harmful. People around
can make them harmful by misusing it
and abusing them.