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The Sulfur Cycle

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SG

Stefan Gaspar

Transcript

The Sulfur Cycle

Human Impact

  • Burning of oil and coal to produce electrical power
  • The process of smelting to convert sulfur compounds into metals such as Copper, Lead, and Zinc
  • Refining petroleum, containing sulfur, in order to heating oil, gas, etc.
  • Sulfur released into the atmosphere results in acid rain

Pathway Continued

Stefan, Ryan, Shelby

  • Some of this sulfur is cycled back into the atmosphere through sea-spray
  • The sulfur that remains in the ocean and is lost in the sea depths

Pathway of movement

  • Cycle begins with the weathering of rocks that release sulfur
  • When the sulfur comes in contact with the air it becomes sulfate
  • Then the sulfate is transferred to plants and organisms and is converted to an organic form
  • Animals then move the sulfate through the food chain by eating these organic materials
  • When these organisms dies, they decompose and release sulfur into the atmosphere as sulfate
  • Some sulfur enters the tissue of microorganisms
  • Volcanoes, organic swamps, and evaporation of water release sulfur into the atmosphere
  • The sulfur then settles back to the surface
  • Runoff from lakes and streams then transfers sulfur into oceans where it is cycled by marine organisms

Inorganic and organic reservoirs for Sulfur

Organic

  • Tissues of microorganisms
  • Emitted by decomposition of organic matter

Inorganic:

  • Soil
  • Water
  • Air
  • Rocks and Minerals
  • Vitamins
  • Seawater

Chemical Reactions Involved

  • Oxidation of sulfide and elemental sulfur (S) and related compounds to sulfate, SO42–.
  • Reduction of sulfate to sulfide
  • Mineralization of organic sulfur to the inorganic form, hydrogen sulfide, H2S.
  • Sulfur is released into the atmosphere through natural processes such as volcanic eruptions, as a by-product of metabolism from bacteria, and from ocean sea-spray
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