Absorbance spectroscopy-based examination of effects of coagulation on the reactivity of fractions of natural organic matter with varying apparent molecular weights

Absorbance spectra of fractions of natural organic matter (NOM) with varying apparent molecular weights (AMWs) were examined in this study. Size exclusion chromatography (SEC) was employed to obtain AMW distributions for three Australian water sources which represented low- and high-dissolved organi...

Full description

Saved in:
Bibliographic Details
Published in:Water research (Oxford) 2009-04, Vol.43 (6), p.1541-1548
Main Authors: Korshin, Gregory, Chow, Christopher W.K., Fabris, Rolando, Drikas, Mary
Format: Article
Language:English
Subjects:
Absorbance spectroscopy
alum
Applied sciences
Australia
Chlorination
Chromatography, Gel
Coagulation
Disinfection by-products
Exact sciences and technology
Molecular Weight
Natural organic matter
Organic Chemicals - analysis
Organic Chemicals - chemistry
Organic Chemicals - isolation & purification
organic matter
Other industrial wastes. Sewage sludge
Pollution
reservoirs
Size exclusion chromatography
Solutions
Spectrophotometry, Ultraviolet
spectroscopy
Wastes
water analysis
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water Purification - methods
Water Supply - standards
Water treatment and pollution
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Absorbance spectra of fractions of natural organic matter (NOM) with varying apparent molecular weights (AMWs) were examined in this study. Size exclusion chromatography (SEC) was employed to obtain AMW distributions for three Australian water sources which represented low- and high-dissolved organic carbon (DOC) surface waters and a source with highly degraded NOM. These waters were coagulated with alum and other coagulants. Effects of coagulation on AMW distributions were quantified based on an absorbance slope index (ASI) calculated using NOM absorbance measured at 220, 230, 254 and 272 nm. This index can be calculated for any AMW fraction of NOM. Similarly to SUVA 254, ASI values decrease consistently in coagulated waters and are correlated with trihalomethane yields. Comparison of ASI indexes in different water sources indicates the presence of both common trends and differences indicative of NOM site-specificity.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2008.12.041