The Effects of Sorption to Mineral Surfaces on the Reactivity of Organic Matter in Marine Sediments

矿物表面吸附对海洋沉积物中有机物反应性的影响

• 批准号: 9402081
• 负责人: Arthur Nowell
• 金额: $ 33.81万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-05-01 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9402081&HistoricalAwards=false
• 关键词: Effects; Sorption; Mineral; Surfaces; Reactivity

NOWELL 9402081 The relationships between mineral charge and texture, sorption of organic matter to mineral surfaces, and the preservation of organic matter in marine sediments will be evaluated in the course of this research. Strong correlations between organic carbon preservation and mineral fluxes & surface areas indicate that processes involving minerals influence the amounts and types of organic matter preserved. Over 90% of the organic matter present in typical marine sediments is sorbed to mineral surfaces and possibly impart stability to inherently labile organic matter, dramatically slowing or stopping the rate at which it is remineralized. Mineral characteristics (mineralogy, cation exchange capacity, surface area and microtopography) will be compared with organic measurements and lability tests to estimate the extent that changes in mineral type and texture affect the sorption and stability of organic matter in marine sediments. The analytical approach proposed here should allow a first-order estimate of the importance sediment mineralogy and texture have on organic matter preservation.

NOWELL 9402081 本研究过程中将评估矿物电荷和结构、有机物对矿物表面的吸附以及海洋沉积物中有机物的保存之间的关系。 有机碳保存与矿物通量和表面积之间的强相关性表明，涉及矿物的过程会影响保存的有机物的数量和类型。典型海洋沉积物中存在的 90% 以上的有机物被吸附到矿物表面，并可能赋予固有不稳定有机物稳定性，从而显着减慢或阻止其再矿化的速度。 矿物特征（矿物学、阳离子交换能力、表面积和微地形）将与有机测量和稳定性测试进行比较，以估计矿物类型和质地的变化影响海洋沉积物中有机物的吸附和稳定性的程度。 这里提出的分析方法应该可以对沉积物矿物学和结构对有机质保存的重要性进行一阶估计。