Molar Mass and Size of Suwannee River Natural Organic Matter Using Multi-Angle Laser Light Scattering

Wagoner, David; Christman, Russell F.; Cauchon, Greg; Paulson, Robert L.

doi:10.1021/es960594z

Cited by 59 publications

(41 citation statements)

References 15 publications

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“…Increased ionic strength (I) may also cause a smaller exposed NOM surface area/volume ratio and thus decreased Cs-NOM association. Relative size distribution measurements of NOM show that it is ''elongated'' at low I, but ''coiled'' at high I (Murphy et al, 1994;Wagoner and Christman, 1997).…”

Section: Extent Of Cs + -Nom Interactionmentioning

confidence: 99%

“…Experimentally, 133 Cs and 35 Cl NMR chemical shift, line width, and 1/T 1 relaxation rate data for solutions containing Cs + , Cl À , and Suwannee River NOM (SRNOM) were obtained to explore both the structural and dynamical aspects of the interactions. SRNOM was chosen for the study, because its composition is relatively well characterized (Aiken et al, 1994;Wagoner and Christman, 1997). 137 Cs is an important and abundant component of many nuclear waste streams.…”

Section: Introductionmentioning

confidence: 99%

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133Cs and 35Cl NMR spectroscopy and molecular dynamics modeling of Cs+ and Cl− complexation with natural organic matter

Kalinichev

Kirkpatrick

2006

Geochimica et Cosmochimica Acta

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Section: Extent Of Cs + -Nom Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

133Cs and 35Cl NMR spectroscopy and molecular dynamics modeling of Cs+ and Cl− complexation with natural organic matter

Kalinichev

Kirkpatrick

2006

Geochimica et Cosmochimica Acta

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“…As described by Ghosh and Schmitzer (1980), fluorescence intensity decreased with increasing ionic strength to suppress the ionization of functional groups by salts and conformational curliness resulting from electrostatic neutralization. Other investigators further corroborated this assumption (Stevenson et al, 1993;Murphy et al, 1994;Wagoner and Christman, 1997). Pan et al (2008) observed that zeta potential increased significantly after Al ion (50 µM) had been added, indicating electrostatic neutralization between added cations and humic acids.…”

Section: Effect Of Ionic Strengthmentioning

confidence: 76%

“…Fluorescence intensity (FI) increased while fluorescence polarization (FP) decreased with increasing humic acid concentrations within the range of 20-100 mg·L -1 ; and in the range of the concentrations higher than 100 mg·L -1 , FI decreased and FP increased with increasing HAs concentrations. That may be attributed to fluorescence quenching and energy transfer due to self-absorption and collision between molecules (Matthews et al, 1996;Wagoner and Christman, 1997). Furthermore, a red shift occurred in Amherst HA with increasing concentrations in the longer wavelength peak region, and the reason may be the same at that for FI and FP.…”

Section: Effect Of Dom Concentrationsmentioning

confidence: 92%

Effects of water chemistry and concentrations of dissolved organic matter on its fluorescence characteristics and molecular conformation

Wang

2009

Chin. J. Geochem.

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Previous studies showed that water chemistry and concentrations of dissolved organic matter (DOM) could affect its molecular conformation and binding characteristics with hydrophobic organic contaminants (HOCs). However, the conformational change of DOM resultant from water chemistry and concentrations of DOM was not extensively investigated; therefore, the contradictory reports regarding the binding property with HOCs were available in literature. In this study, the effects of ionic strength, pH and DOM concentrations on the fluorescence properties of two humic acids (HA), namely Fluka HA and Amherst HA, were investigated by three-dimensional excitation-emission matrix fluorescence spectroscopy (3DEEM) and steady-state fluorescence polarization (FP) techniques. The results not only corroborated previous observations obtained by other investigators, but revealed some new information about the fluorescence properties and molecular conformation of the humic acids under different water chemistry and DOM concentration conditions, which could shed light on its binding mechanisms and binding properties with HOCs.

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“…Using NaCl + HNS as a base solution, different concentrations of the constituents were created to simulate a range of potential concentrations, a list of which is provided in Table 2. These concentrations were categorized based on amounts naturally found in the environment (Jones, 1998;Strobel, 2001;Wagoner et al, 1997).…”

Section: Simulated Constituent Solution Preparationmentioning

confidence: 99%

Preferential flow systems amended with biogeochemical components: imaging of a two-dimensional study

Pales

Clifford

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. The vadose zone is a highly interactive heterogeneous system through which water enters the subsurface system by infiltration. This paper details the effects of simulated plant exudate and soil component solutions upon unstable flow patterns in a porous medium (ASTM silica sand; US Silica, Ottawa, IL, USA) through the use of two-dimensional tank light transmission method (LTM). The contact angle (θ ) and surface tension (γ ) of two simulated plant exudate solutions (i.e., oxalate and citrate) and two soil component solutions (i.e., tannic acid and Suwannee River natural organic matter, SRNOM) were analyzed to determine the liquidgas and liquid-solid interface characteristics of each. To determine if the unstable flow formations were dependent on the type and concentration of the simulated plant exudates and soil components, the analysis of the effects of the simulated plant exudate and soil component solutions were compared to a control solution (Hoagland nutrient solution with 0.01 M NaCl). Fingering flow patterns, vertical and horizontal water saturation profiles, water saturation at the fingertips, finger dimensions and velocity, and number of fingers were obtained using the light transmission method. Significant differences in the interface properties indicated a decrease between the control and the plant exudate and soil component solutions tested; specifically, the control (θ = 64.5 • and γ = 75.75 mN m −1 ) samples exhibited a higher contact angle and surface tension than the low concentration of citrate (θ = 52.6 • and γ = 70.8 mN m −1 ). Wetting front instability and fingering flow phenomena were reported in all infiltration experiments. The results showed that the plant exudates and soil components influenced the soil infiltration as differences in finger geometries, velocities, and water saturation profiles were detected when compared to the control. Among the tested solutions and concentrations of soil components, the largest finger width (10.19 cm) was generated by the lowest tannic acid solution concentration (0.1 mg L −1 ), and the lowest finger width (6.00 cm) was induced by the highest SRNOM concentration (10 mg L −1 ). Similarly, for the plant exudate solutions, the largest finger width (8.36 cm) was generated by the lowest oxalate solution concentration (0.1 mg L −1 ), and the lowest finger width (6.63 cm) was induced by the lowest citrate concentration (0.1 mg L −1 ). The control solution produced fingers with average width of 8.30 cm. Additionally, the wettability of the medium for the citrate, oxalate, and SRNOM solutions increased with an increase in concentration. Our research demonstrates that the plant exudates and soil components which are biochemical compounds produced and released in soil are capable of influencing the process of infiltration in soils. The results of this research also indicate that soil wettability, expressed as (cos θ )

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Molar Mass and Size of Suwannee River Natural Organic Matter Using Multi-Angle Laser Light Scattering

Cited by 59 publications

References 15 publications

133Cs and 35Cl NMR spectroscopy and molecular dynamics modeling of Cs+ and Cl− complexation with natural organic matter

133Cs and 35Cl NMR spectroscopy and molecular dynamics modeling of Cs+ and Cl− complexation with natural organic matter

Effects of water chemistry and concentrations of dissolved organic matter on its fluorescence characteristics and molecular conformation

Preferential flow systems amended with biogeochemical components: imaging of a two-dimensional study

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