An FTIR-DRIFT Study on River Sediment Particle Structure: Implications for Biofilm Dynamics and Pollutant Binding

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• 作者：Tom Gallé ; Barend Van Lagen ; Andreas Kurtenbach ; and Reinhard Bierl
• 刊名：Environmental Science & Technology
• 出版年：2004
• 出版时间：September 1, 2004
• 年：2004
• 卷：38
• 期：17
• 页码：4496 - 4502
• 全文大小：139K
• 年卷期：v.38,no.17(September 1, 2004)
• ISSN：1520-5851

文摘

Diffuse reflectance infrared Fourier transform (DRIFT)spectrometry was applied to a set of sediment samplescollected by traps over one and a half years in a mid-mountainous river. Dynamic changes in hydrological and life-cycle conditions generated sediment particles of differentC_org content and organic composition. Periods in themidst of or shortly after flood events left particles poor inC_org content with spectral features that were enrichedin carboxylic and aromatic signals. These are characteristicof terrestrial oxidized vascular plant debris. Low-flowconditions saw the consequent build-up of amide, aliphatic,and polysaccharide moieties as expected for autochthonousbiofilm derived material. A peak ratio of two bandsrepresenting the alternation of these two types of organicmatter showed that flood particle C_org had a higheraffinity for metals than the high C_org of mature biofilms,probably owing to higher COO^- contents in the first. Therelative dietary bioavailability of the metals from sedimentC_org, which is related to the nutritional value of thesubstrate, is therefore probably lower in the aftermath ofa flood than in prolonged low-flow situations. This needs tobe accounted for in future metal speciation and bioavailabilitymodeling approaches.