The Sulfur Cycle

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by LizHenderson05
Last updated 4 years ago


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The Sulfur Cycle

The Sulfur Cycle

Most of the earth's sulphur is tied up in rocks and salts or buried deep in the ocean in oceanic sediments. Sulphur can also be found in the atmosphere, entering it through both natural and human sources. Natural recourses can be for instance volcanic eruptions, bacterial processes, evaporation from water, or decaying organisms.

Basic Info.

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Step 2

Step 1

Interesting facts

First, organic sulfur becomes mineralized into organic hydrogen sulfide, sulfide minerals, and elemental sulfur.

Next, the hydrogen sulfide, sulfide minerals, and elemental sulfur are oxidized into sulfate.

During the third step, sulfate is reduced to sulfide.

Finally, sulfide becomes incorporated into organic compounds.

When Sulphur enters the atmosphere through human activity, this is mainly a consequence of industrial processes with sulphur dioxide (SO2) and hydrogen sulfide (H2S) gases are emitted on a wide scale. When sulphur dioxide enters the atmosphere it will react with oxygen to prduced sulphur trioxide gas (SO3), or with other chemicals in the atmosphere, to produce sulphur salts. Sulphur dioxide may also react with water to produce sufuric acid (H2SO4). Sufuric acid may also be produced from demethylsulphide, which is emitted to the atmosphere by plankton species. All these partices will settle onto earth, or react with rain and fall back onto earth as acid depostion. The particles will then be absorbed by plants again and are released back into the atmosphere, so that the sulphur cycle will start over again.


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