Sediment continued phosphorus

Tiyapongpattana, W., Pongsakul, P., Shiowatana, J., and Nacapricha, D. (2004). Sequential extraction of phosphorus in soil and sediment using a continuous-flow system. Talanta 62 765-771. 

Thus, the characteristic topographic function increases continuously from the surface (z = z0) to the lake bottom (z = 0) where it becomes infinitely large. In fact, at the lake bottom a tiny lake volume stays in contact with a finite sediment area. This explains the great spatial and temporal gradients often found close to the bottom of lakes for compounds which are exchanged at the sediment-water interface (oxygen, phosphorus, methane, etc.). 

Some important biogenic elements, such as phosphorus,caIcium and magnesium, have their own characteristic sedimentation cycle. In this type of cycle, elements from biological systems are continuously lost due to erosion and excessive use in economic activities (e.g. phosphorus in the form of industrial fertilizers, detergents, etc.) and they axe finally stored in the sea. 

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