Get ready to see some

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Get ready to see some pictures
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What cause the tragedy?
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Our topic MINAMATA DISEASE MERCURY ? ? ? ? ?
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Silver Aven Wolf Minmin
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Introduction MINAMATA DISEASE
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• What we now call Minamata disease was
  first observed in communities near Minamata Bay
  in Southwestern Japan.

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The Fact of Minamata Disease

• Levels of methylmercury chloride reached 50 ppm
  in fish and 85 ppm in shellfish obtained from the
  contaminated areas.
• One hundred and twenty one persons were poisoned,
  46 fatally, from eating the contaminated fish.
• Dogs, cats, pigs, rats, and birds living around
  the bay developed classical clinical signs and
  many died.

The dead fish
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The symptom of Minamata Disease

• In most cases, first without any apparent signs.
• numbness of the limbs and the area around the
  mouth,sensory disturbance, difficulty with hand
  movements.
• lack of coordination, weakness and tremor, slowed
  and slurred speech, ataxic gait, disturbances of
  vision and hearing.
• Became aggravated and led to general paralysis,
  deformity of the limbs, difficulty in swallowing,
  convulsions, and death.

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The Cause of Minamata Disease
For production purposes, the company made use of
large amounts of mercury compounds as reaction
catalysts. The increased volume of production
wastes was discharged into Minamata Bay without
any treatment.
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It is Mercury

• By 1959 it had been demonstrated that the
  minamata disease was caused by ingestion of fish
  contaminated by mercury discharged from a
  chemical manufacturer plant.

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About Environmental Mercury

• Mercury is a silvery, liquid metal at room
  temperature.
• It is sometimes referred to as one of the "heavy
  metals.
• Like water, mercury can evaporate and become
  airborne.
• Because it is an element, mercury does not break
  down into less toxic substances.
• Bacteria and chemical reactions in lakes and
  wetlands change mercury into a much more toxic
  form known as methylmercury.

This is mercury
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Mercury enters the environment from
Hg

• A naturally occurring element
• Natural sources volcanoes and the weathering of
  rocks
• Our intentional uses of mercury
• Our unintentional releases of mercury burning
  fossil fuels and smelting metals
• A by-product of gold and zinc mining

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• Power plants are responsible for 34 of the total
  mercury emitted by all known sources.
• More than 99 of that mercury comes from
  coal-fired power plants.

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Pollution Mechanism
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Whats worse, mercury can Cross blood-brain
barrier as well as placenta barrier, so parents
need information in order to protect not only
their own health but also the health of their
unborn babies.
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Treatment
Major reductions bans in paint and pesticides,
phaseouts in batteries , and reductions in
industrial uses. Continued effective control of
mercury emissions may require a mix of strategies
including pollution prevention, materials
separation, and conventional regulatory
approaches.
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A Biologically Mediated Mercury Cycle in
Aquatic Systems
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Mercury Investigations
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Developing Bacteria that Degrade
Contaminants
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Thanks for Your Attention

Happy New Year