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- W2064935312 abstract "The surface chemistry of cultured diatoms was compared to that of biosiliceous material in Southern Ocean sediments, using potentiometric titrations and aluminum adsorption experiments. Aerosil 200, a well-studied synthetic amorphous silica, served as reference solid. Surface charge development and aluminum adsorption on cultured diatom shells were comparable to Aerosil. The surface chemical properties of biosiliceous material buried to depths of 15–25 cm in Southern Ocean sediments, however, deviated markedly from those of the cultured diatoms. In pH range 4–8.5, the surface charge density was systematically lower for biogenic silica from the sediments. In addition, the aluminum adsorption edge on the biosiliceous sediments was shifted to higher pHs by about 0.4 units. The results indicate that ionizable surface silanol groups on diagenetically altered diatom shells are less abundant and, possibly, less acidic than on freshly cultured diatoms. The observed differences in surface chemical structure are consistent with the progressive loss of reactivity, or aging, of biogenic silica which promotes its preservation in sediments." @default.
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- W2064935312 date "2002-07-01" @default.
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- W2064935312 title "Surface chemistry and reactivity of biogenic silica" @default.
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- W2064935312 doi "https://doi.org/10.1016/s0016-7037(02)00854-2" @default.
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