Characterization of the changes in polarity of natural organic matter using solid-phase extraction: introducing the NOM polarity rapid assessment method (NOM-PRAM)

2004 ◽  
Vol 4 (4) ◽  
pp. 11-18 ◽  
Author(s):  
F.L. Rosario-Ortiz ◽  
K. Kozawa ◽  
H.N. Al-Samarrai ◽  
F.W. Gerringer ◽  
C.J. Gabelich ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Solid Phase Extraction ◽  
Natural Organic Matter ◽  
Solid Phase ◽  
Rapid Assessment ◽  
Assessment Method ◽  
Phase Extraction ◽  
Rapid Assessment Method ◽  
Wide Range

A new technique has been developed to quickly monitor the changes in polarity of aqueous natural organic matter (NOM) using solid-phase extraction (SPE) cartridges. This paper introduces the NOM polarity rapid assessment method (PRAM). The PRAM technique characterizes changes in NOM polarity by monitoring the breakthrough curves from different SPE cartridges at UV254. The SPE cartridges used in this study include a wide range of polarity from non-polar C-18 materials to anion exchangers. Each individual cartridge run takes 10 minutes and requires about 15 ml of sample. The collected water sample matrix is not changed, i.e. all PRAM analyses were done under ambient conditions on the original sample. Polarity evaluation is completed without the sample being exposed to changes in sample conditions, such as pH, solvent extraction, sequential evaporations or freeze-drying. This technique was able to monitor the weekly changes in NOM polarity entering a water treatment plant and compares the effects of different water treatment processes on this material.

Rapid Fractionation of Natural Organic Matter in Water Using a Novel Solid-Phase Extraction Technique

2009 ◽  
Vol 81 (11) ◽  
pp. 2299-2308 ◽  
Author(s):  
Thunyalux Ratpukdi ◽  
James A. Rice ◽  
Gabriela Chilom ◽  
Achintya Bezbaruah ◽  
Eakalak Khan
Keyword(s):  
Organic Matter ◽  
Solid Phase Extraction ◽  
Natural Organic Matter ◽  
Solid Phase ◽  
Extraction Technique ◽  
Phase Extraction

Fluorescence property of solvent extractable organic aerosol in a cold-temperate forest area of Japan

2021 ◽  
Author(s):  
Sonia Afsana ◽  
Yuzo Miyazaki ◽  
Eri Tachibana ◽  
Dhananjay Kumar Deshmukh ◽  
Kimitaka Kawamura ◽  
...  
Keyword(s):  
Organic Matter ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Organic Aerosol ◽  
Water Soluble ◽  
Fluorescence Property ◽  
Phase Extraction ◽  
Soluble Organic Matter ◽  
Radiative Balance ◽  
Wide Range

<p>Organic aerosol (OA), a major component of atmospheric aerosol, is considered to be one of the key players in atmospheric radiative balance and climate change. Chromophoric OA, termed as brown carbon (BrC), is a component that can absorb solar radiation in the ultraviolet and short-wavelength visible regions and is composed of a wide range of poorly characterized compounds. Whereas light absorption properties were analyzed to characterize chromophoric OA, fluorescent properties also provide information on them. In this study, the fluorescence property of solvent extractable organics in submicron aerosol particles collected in a forest in the cool-temperate zone of northern Japan, was characterized.</p><p>Aerosol samples were collected on quartz filters (cut-off diameter: ≤0.95 micrometer) in Tomakomai Experimental Forest of Hokkaido University. Organic aerosol components in the samples were extracted and fractionated on the basis of their polarity by the combination of solvent extraction and solid-phase extraction methods. Water-soluble organic matter (WSOM) and water-insoluble organic matter (WISOM) were extracted sequentially by using multiple solvents. Two fractions, humic-like substance (HULIS) and highly-polar water-soluble organic matter (HP-WSOM), were fractionated from WSOM by solid phase extraction. The excitation−emission matrices (EEMs) were measured using a fluorescence spectrometer, and the fluorescence property of the extracts was characterized by the classification of EEM profiles using a Parallel Factor (PARAFAC) model.</p><p>From the PARAFAC analysis, five types of fluorescent components were identified for each of WSOM and WISOM fractions. A fluorescence component with the characteristics reported to be associated with (HULIS) accounted for large fractions of the fluorescence from WSOM and WISOM (mean: 68% and 84%, respectively). The relative contribution of the fluorescent components for WSOM shows a clear seasonal variation of the characteristics of WSOM. Furthermore, from each of HULIS and HP-WSOM fractions, five types of fluorescent components were identified. Fluorescence components with the characteristics of protein-like compounds identified in previous EEM studies accounted for a large fraction of the fluorescence from HP-WSOM (mean: 53%), whereas the contribution of protein-like compounds was smaller in the case of the HULIS fraction (mean: 23%).</p>

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