Adsorption and desorption of different organic matter fractions on iron oxide

Gu, Baohua; Schmitt, Jürgen; Chen, Zhihong; Liang, Liyuan; McCarthy, John F.

doi:10.1016/0016-7037(94)00282-q

Cited by 634 publications

(477 citation statements)

References 34 publications

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“…The observation that different size fractions of NOM exhibit very different transport behavior is consistent with observations of Davis and Gloor [1981] and Gu et al [1995] that higher molecular weight components of NOM have a greater affinity for adsorption to mineral oxides and with previous field observations of NOM transport [McCarthy et al, 1993]. Gu et al [1995] determined isotherms for adsorption of size fractions of Georgetown NOM on iron oxide because this mineral was expected to be the dominant adsorptive phase in the ironcoated sands at Georgetown.…”

Section: Resultssupporting

confidence: 88%

“…Discrepancies between the laboratory and field results were also informative. For example, the discrepancy between the adsorption of NOM subcomponents on a model sorbent that lacked any previously adsorbed NOM [Gu et al, 1995] and field results lead to our hypothesis that previous coatings of NOM on surfaces controlled NOM adsorption and transport behavior in the field. This field-derived hypothesis has now been confirmed in laboratory studies on the competitive interactions among NOM and model organic com-pounds [Gu et al, 1996a, b].…”

Section: Discussionmentioning

confidence: 95%

“…Gu et al [1995] determined isotherms for adsorption of size fractions of Georgetown NOM on iron oxide because this mineral was expected to be the dominant adsorptive phase in the ironcoated sands at Georgetown. The adsorption affinity and capacity of the Ͻ3000 NOM were lower than that of the larger size fraction, but only by ϳ20%.…”

Section: Resultsmentioning

confidence: 99%

“…The ''brown water'' contains high levels of NOM (66 mg C L Ϫ1 ). Its chemical properties and adsorption behavior are described by Gu et al [1994Gu et al [ , 1995. In brief, the Fourier transform infrared (FTIR) and nmr spectra of the NOM resemble those of humic substances found in aquatic systems and soil fulvic acids [Stevenson and Goh, 1971;Thurman, 1985].…”

Section: Methodsmentioning

confidence: 99%

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Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

McCarthy¹,

Gu²,

Liang³

et al. 1996

Water Resources Research

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Abstract. The field-scale transport of natural organic matter (NOM) was examined in a two-well forced gradient injection experiment in a sandy, coastal plain aquifer in Georgetown, South Carolina. Spatial moments described the migration of the center of mass of NOM and conservative tracer. Temporal moments were used to estimate mass loss and retardation of the NOM along a transect of six sampling locations at two depths and at the withdrawal well. Large differences were observed in transport behavior of different subcomponents of NOM. Larger and more strongly binding NOM components in the injection solution are postulated to adsorb and displace weakly binding, low-molecular weight NOM in groundwater. Conversely, NOM components that were similar to the groundwater NOM were transported almost conservatively, presumably due to ''passivation'' of the aquifer by previously adsorbed components of the groundwater NOM. NOM may thus exhibit two types of effects on contaminant dynamics in the subsurface. When the equilibria between solution and solid phase NOM is disrupted by introduction of a novel source of NOM, descriptions of the multicomponent transport process are complex and predictive modeling is problematic. Because of the differences in transport behavior of NOM subcomponents, the chemical properties and, more importantly, the functional behavior of NOM with respect to contaminant migration will vary with time and distance along a flow path. However, when groundwater NOM exists at a steady state with respect to adsorption on aquifer surfaces, the migration of NOM, and the contaminant-NOM complex, may be approximated as the transport of a conservative solute.

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Section: Resultssupporting

confidence: 88%

Section: Discussionmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

McCarthy¹,

Gu²,

Liang³

et al. 1996

Water Resources Research

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“…Furthermore, the ignition characteristics and FTIR spectra of organic matter vary owing to changes in the state of organic matter during decomposition [18], [19]. In the case of the SMFC application (i.e., the electron recovery from sediment), Touch et al [20] confirmed decreases in ammonium (NH 4 + ) and phosphate (PO 4 3− ) concentrations in the sediment pore water.…”

Section: Changes In the Concentration Of Nutrient Salts In The Sedmentioning

confidence: 99%

Changing Organic Matter Characteristics of Littoral Sediment by Solar Cell-Combined Sediment Microbial Fuel Cell

Touch¹,

Takata²,

Yamaji³

et al. 2018

IJESD

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Abstract-Metal ion or clay mineral-adsorbed organic matter present in littoral sediment is known as hardly decomposed organic matter, which is difficult to use as a natural resource. This study is aimed at changing the organic matter characteristics of littoral sediment through the application of solar cell-combined sediment microbial fuel cell (SC-SMFC). The experimental results showed that the sediment pH decreases and the concentration of metal ions in the sediment pore water increases after the application of SC-SMFC. This suggests the dissociation of metal complexes in the sediment. From the analysis results of organic matter characteristics, variations in the ignition characteristics of the sediment and the absorbance at wave number ranges of 3300-3800 and 800-1800 cm -1 were confirmed, indicating changes in organic matter characteristics of the sediment. It can be concluded that SC-SMFC can separate organic matter from metal complexes, leading to the transformation of organic matter in sediment from valueless into a useful product.

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Applications of Vibrational Spectroscopy in Soil and Environmental Sciences

Johnston

Wang

2001

Handbook of Vibrational Spectroscopy

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The sections in this article are Introduction Sampling Methods Attenuated Total Reflection Diffuse Reflection Transmission Micro‐ R aman Spectroscopy Using Molecular Probes to Study Environmental Particles Water Oxyanions Organic Probe Molecules Organic Cations Organic Anions Neutral Organic Compounds IR and R aman Studies of Humic Substances Summary

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Adsorption and desorption of different organic matter fractions on iron oxide

Cited by 634 publications

References 34 publications

Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

Field Tracer Tests on the Mobility of Natural Organic Matter in a Sandy Aquifer

Changing Organic Matter Characteristics of Littoral Sediment by Solar Cell-Combined Sediment Microbial Fuel Cell

Applications of Vibrational Spectroscopy in Soil and Environmental Sciences

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