Characterization of Norwegian natural organic matter: Size, diffusion coefficients, and electrophoretic mobilities

Lead, Jamie R.; Balnois, Eric; Hosse, Monika; Menghetti, René; Wilkinson, Kevin J.

doi:10.1016/s0160-4120(98)00103-2

Cited by 52 publications

(31 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AFM images for the same sample under identical conditions produced in our laboratories and elsewhere indicate that small macromolecules of 1-5 nm are dominant. However, aggregates of natural organic matter (NOM) with similar dimensions have also been observed by AFM (8). Most likely the differences sometimes observed are due to the different modes of operation, including different resolution levels of the two types of microscopy, rather than artifacts in one or both methods.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Humic Substances by Environmental Scanning Electron Microscopy

Redwood

Lead

Harrison

et al. 2005

Environ. Sci. Technol.

View full text Add to dashboard Cite

Environmental scanning electron microscopy (ESEM) is a new technique capable of imaging micron and submicron particles. Here, we have applied it to image and quantify natural aquatic organic matter (standard Suwannee River humic acid, SRHA). Uniquely, we have observed the humic aggregate structures as a function of humidity and pH. Large aggregates of tens of micrometers were observed as the dominant material under all conditions, although much smaller material was also observed. Fractal dimensions (D) were calculated between 1.48 and 1.70, although these values were not statistically different under conditions of low humidity. However, D values calculated at high humidities (85%) during the rehydration phase were significantly lower (1.48+/-0.01) than in the initial dehydration phase (1.69+/-0.01). This hysteresis indicated that full rehydration of the HS was either kinetically slow or irreversible after dehydration. Fractal analysis of ESEM images was also performed to probe the change in aggregate structure as a function of pH. Minimum values were calculated at neutral pHs, rising by 0.1-0.2 at both high and low pHs because of a combination of the physical chemistry of HS and the impacts of the drying regime within the ESEM. Thus, ESEM was an important complementary technique to other analytical methods. At present, ESEM cannot be used to image nonperturbed natural samples. However, the method is an ideal method for probing the changes in colloid structure as function of hydration state and has the potential to perform fully quantitative and nonperturbing analysis of colloidal structure.

show abstract

Section: Resultsmentioning

confidence: 99%

“…However, HS are complex, polydisperse, colloidal systems, which are poorly understood (8). Up to the present time, few techniques exist which can quantify their structure in a minimally perturbing manner.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Humic Substances by Environmental Scanning Electron Microscopy

Redwood

Lead

Harrison

et al. 2005

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Fluorescence correlation spectroscopy gives a direct measurement of the values of diffusion coefficients, and the hydraulic diameter of humic substances is estimated to be 1.6 -2.0 nm by Lead et al [36]. Its reported that calculations using Stokes' law indicated the colloidal biopolymers in natural water are >10 nm [36,37].…”

Section: Organic Matter Characterization By Lc-ocdmentioning

confidence: 99%

“…Its reported that calculations using Stokes' law indicated the colloidal biopolymers in natural water are >10 nm [36,37].…”

Section: Organic Matter Characterization By Lc-ocdmentioning

confidence: 99%

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Shang

Vuong

et al. 2015

Separation and Purification Technology

View full text Add to dashboard Cite

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. irreversible fouling, is still a critical aspect affecting the operational cost and energy consumption in water treatment plants. In this study, four ceramic membranes with pore sizes or molecular weight cut-off (MWCO) of 0.20 μm, 0.14 μm, 300 kDa and 50 kDa were compared during natural surface water filtration with respect to hydraulically irreversible fouling index (HIFI), foulant composition and narrowing of pore size due to the irreversible fouling. Our results showed that the hydraulically irreversible fouling index (HIFI) was proportional to the membrane pore size (r 2 =0.89) when the same feed water was filtrated. The UF membranes showed lower HIFI values than the MF membranes. Pore narrowing (internal fouling) was found to be a main fouling pattern of the hydraulically irreversible fouling. The internal fouling was caused by monolayer adsorption of foulants with different sizes that is dependent on the size of the membrane pore.

show abstract

“…In contrast, some multi-method studies to evaluate colloidal properties have shown only partial agreement (and indeed often substantial differences) in size distributions, metal binding properties and colloidal morphologies, especially for natural samples {e.g. AFM, transmission electron microscopy (TEM) and FCS [49]; AFM and ESEM [15]; AFM and TEM [47]; and CFF and FlFFF [10]}. In addition to the size distributions provided in Figure 2, comparative SEM and ESEM images obtained from a single sampling from a freshwater sample are given in Figure 4.…”

Section: Strategies For Advancing Our Understanding Of Colloidal Systemsmentioning

confidence: 99%

Environmental Colloids and Particles: Current Knowledge and Future Developments

Lead

Wilkinson

2006

Environmental Colloids and Particles

View full text Add to dashboard Cite

Characterization of Norwegian natural organic matter: Size, diffusion coefficients, and electrophoretic mobilities

Cited by 52 publications

References 26 publications

Characterization of Humic Substances by Environmental Scanning Electron Microscopy

Characterization of Humic Substances by Environmental Scanning Electron Microscopy

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Environmental Colloids and Particles: Current Knowledge and Future Developments

Contact Info

Product

Resources

About