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A Study on the Dissolution Behavior of Biogenic Silica in Coastal Sea

Author: LuChao
Tutor: LiuSuMei
School: Ocean University of China
Course: Marine Chemistry
Keywords: Biogenic silica Lye extraction experiment Batch culture experiments Continuous flow culture experiments Dissolution behavior Jiaozhou Bay
CLC: P734
Type: Master's thesis
Year: 2010
Downloads: 57
Quote: 0
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Abstract


Si is an essential nutrient elements for diatom growth , with the increase in the input of the recent years, land-based sources of N, P , Si / N , Si / P reducing increases the offshore Si limit potential . Si restrictions will lead to changes in the phytoplankton community , impact on the sustainable development of coastal ecosystems . Therefore it is necessary to study offshore biogenic silica dissolution and regeneration process . In lye extraction experiments, batch culture on the basis of the experimental analysis , the establishment of a continuous flow culture experiments , combined with a continuous flow analysis of offshore biogenic silica dissolution behavior vitro results . Lye extraction experiments show that : sediments within biological silicon - partly in another form , avoid directly involved in the dissolution . Biogenic silica structural changes occurred during burial . Batch culture experiments showed that : biogenic silica in marine sediment dissolved difficult to reach their solubility ; fresh diatoms into sediments can improve DSi concentration in the culture medium , but when the the DSi concentration exceeds solubility of sediment continue to dissolve blocked . The continuous-flow culture experimentally measured in marine sediment biogenic silica dissolution rate constant is on the order of magnitude of 1-10 yr-1 , most less than 5yr-1 compared to the dissolution rate constant and deep . Sediment types have a greater impact for the preservation of biogenic silica ; solubility of biogenic silica from the water to the deep sediments show a reducing trend . The presence of biogenic silica in sediments rapidly than the dissolution rate constant lower layer, and favor the preservation of biogenic silica in marine sediment .

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine Chemistry
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