sulphur cycle

sulphur cycle

The passage of sulphur from organic to inorganic forms, from substituents of cells to minerals, via the following steps: (1) uptake of sulphate from soil by organisms and conversion into organic sulphur, or reduction to the gas dimethylsulphide (e.g. by algae and cyanobacteria), (2) photochemical oxidation to methanesulphonic acid in the atmosphere, (3) return to the soil as it falls to earth in rain and snow, and (4) oxidation to sulphate by soil bacteria.

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