Characterization of DOM as a function of MW by fluorescence EEM and HPLC-SEC using UVA, DOC, and fluorescence detection

Her, Namguk; Amy, Gary L.; McKnight, Diane M.; Sohn, Jinsik; Yoon, Yeomin

doi:10.1016/s0043-1354(03)00317-8

Cited by 464 publications

(214 citation statements)

References 12 publications

Supporting

Mentioning

199

Contrasting

Unclassified

Order By: Relevance

“…Operation conditions were as follows: eluent flow rate 0.4 ml min À1 , injection volume 200 ll, UV detector wavelength 254 nm, retention time 33 min. According to Her et al (2003), calibration for molecular weight as a function of retention time (t) (expressed as log 10 MW = 11.556À0.4563t, R 2 = 0.991) was set up with polyethylene glycols (i.e., 20, 10, 6, 1, and 0.6 kDa) and salicylic acid as standards.…”

Section: Discussionmentioning

confidence: 99%

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

et al. 2008

View full text Add to dashboard Cite

Fluorescence spectra were applied to investigate the structural changes of four dominant dissolved natural organic matter (DOM) fractions of a filtered river water before and after ozonation and catalytic ozonation. The ozonation and catalytic ozonation with synthetic goethite (FeOOH) and cerium dioxide (CeO 2 ) were carried out under normal conditions, i.e. pH 7, reaction time of 10 min, and ozone/DOC ratio of about 1. The fluorescence spectra were recorded at both excitation-emission matrix (EEM) and synchronous scanning modes. EEM results reveal that ozonation of these DOM fractions causes a significant decrease of the aromaticity of humic-like structures and an increase of electron withdrawing groups, e.g., carboxylic groups. The catalysts can further improve the destruction of the humic-like structures in catalytic ozonation. Synchronous spectra reveal that ozonation of hydrophobic acid and hydrophilic acid (HIA) yields a significant amount of by-products with low aromaticity and low molecular weight. Catalytic ozonation enhances substantially the formation of these by-products from HIA and improves the destruction of highly polycyclic aromatic structures for all examined DOM fractions.

show abstract

Section: Discussionmentioning

confidence: 99%

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

et al. 2008

View full text Add to dashboard Cite

show abstract

“…However, natural organic matter (NOM) is often a major foulant during the ultrafiltration of surface water [1,2], since it contains a complex mixture of humic and fulvic acids, proteins, carbohydrates of various molecular sizes and functional groups [2][3][4][5], which can either bind to the membrane surface or support the development of microbiological fouling.…”

Section: Introductionmentioning

confidence: 99%

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

et al. 2014

Journal of Membrane Science

View full text Add to dashboard Cite

a b s t r a c tPre-coagulation by alum before ultrafiltration without (CUF) and with (CAUF) powdered activated carbon (PAC) addition was investigated to explore the influence of PAC on membrane fouling. It was found that the continuous addition of a low dosage of PAC reduced membrane fouling for operational run periods o20 days, both for reversible and for irreversible components of fouling. The presence of PAC increased the removal of dissolved organic matter (DOM), particularly proteinaceous substances, and some fractions of humic-type substances. For a longer operation time (420 days) an increase in mainly reversible fouling was evident and was attributed to microorganism growth in the cake layer, as indicated by the enhanced concentrations of extracellular polymeric substances, such as polysaccharides and proteins. A process of crystallization of the coagulant floc in the cake layer with increasing operation time was believed to cause desorption of DOM from primary coagulation particles and a decrease in their size, and consequently a higher density of cake layer. PAC absorption of desorbed DOM within the cake layer, and residual DOM after coagulation, reduced DOM reaching the membrane surface and the extent of subsequent internal membrane fouling.Crown

show abstract

“…The main applications of fluorescence spectroscopy include the characterization of DOM composition and sources and determination of the general water quality. The method is non-invasive, rapid and accurate with potential for online monitoring (Baker, 2001;Her et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Fluorescence spectroscopy as a tool for determination of organic matter removal efficiency at water treatment works

Bieroza

Bridgeman

Baker

2010

Drink. Water Eng. Sci.

View full text Add to dashboard Cite

Abstract. Organic matter (OM) in drinking water treatment is a common impediment responsible for increased coagulant and disinfectant dosages, formation of carcinogenic disinfection-by products, and microbial re-growth in distribution system. The inherent heterogeneity of OM implies the utilization of advanced analytical techniques for its characterization and assessment of removal efficiency. Here, the application of simple fluorescence excitation-emission technique to OM characterization in drinking water treatment is presented. The fluorescence data of raw and clarified water was obtained from 16 drinking water treatment works. The reduction in fulvic-like fluorescence was found to significantly correlate with OM removal measured with total organic carbon (TOC). Fluorescence properties, fulvic-and tryptophan-like regions, were found to discriminate OM fractions of different removal efficiencies. The results obtained in the study show that fluorescence spectroscopy provides a rapid and accurate characterization and quantification of OM fractions and indication of their treatability in conventional water treatment.

show abstract

Characterization of DOM as a function of MW by fluorescence EEM and HPLC-SEC using UVA, DOC, and fluorescence detection

Cited by 464 publications

References 12 publications

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

Fluorescence spectroscopy as a tool for determination of organic matter removal efficiency at water treatment works

Contact Info

Product

Resources

About