Investigations on Mineralogical and Chemical Composition of Suspended Particulate Matter (SPM) in the Odra Estuary

Breitenbach, E.; Lampe, R.; Leipe, T.

doi:10.1002/(sici)1521-401x(199911)27:5<298::aid-aheh298>3.3.co;2-2

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“…The carbonates fraction is more variable and sometimes absent, as they might dissolve with distance from the lithological source. Their presence is often related to an increased microbial activity (Breitenbach et al, 1999;Eidam et al, 1997;Sigleo and Helz, 1981) and artefacts from sample preparation, e.g. precipitation, can distort the picture (Bibby and Webster-Brown, 2005;McGuire and Herman, 2015).…”

Section: Phyllosilicates Dominate the Mineral Fractionmentioning

confidence: 99%

“…Different conceptions of SPM are reflected in the diversity of terms across disciplines. The most common ones are suspended sediments (Droppo et al, 1998;Hillier, 2001;McConnachie and Petticrew, 2006;Pont et al, 2002), suspended (particulate) matter (Baalousha et al, 2019;Breitenbach et al, 1999;Le Meur et al, 2016;Ran et al, 2000), (total) suspended solids (Berger et al, 1996;Bilotta et al, 2012;Droppo and Ongley, 1994), which share the idea of a material suspended under given conditions. Suspended sediments stresses sedimentation and resuspension as a major SPM control but falls short of implying material inputs by runoff, soil-erosion and pelagic bioproduction.…”

Section: Introductionmentioning

confidence: 99%

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Freshwater Suspended Particulate Matter – Key Components and Processes in Floc Formation and Dynamics.

Walch¹,

Kammer²,

Hofmann³

2022

Preprint

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Freshwater suspended particulate matter (SPM) plays an important role in many biogeochemical cycles and serves multiple ecosystem functions. Most SPM is present as complex floc-like aggregate structures composed of various minerals and organic matter from the molecular to the organism level. Flocs provide habitat for microbes and feed for larger organisms. They constitute microbial bioreactors, with prominent roles in carbon and inorganic nutrient cycles, and transport nutrients as well as pollutants, affecting sediments, inundation zones, and the ocean. Composition, structure, size and concentration of SPM flocs are subject to high spatiotemporal variability. Floc formation processes and compositional or morphological dynamics can be established around three crucial components: phyllosilicates, iron oxides/(oxy)hydroxides (FeOx) and microbial extracellular polymeric substances (EPS). These components and their interactions increase heterogeneity in surface properties, enhancing flocculation. Phyllosilicates exhibit intrinsic heterogeneities in surface charge and hydrophobicity. They are preferential substrates for precipitation or attachment of reactive FeOx. FeOx form patchy coatings on minerals, especially phyllosilicates, which increase surface charge heterogeneities. Both, phyllosilicates and FeOx strongly adsorb natural organic matter (NOM), preferentially certain EPS. EPS comprise various substances with heterogeneous properties that make them a sticky mixture enhancing flocculation. Microbial metabolism, and thus EPS release, is supported by the high adsorption capacity and favorable nutrient composition of phyllosilicates and FeOx supply essential Fe.

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