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The evaluation for alterations of DOM components from upstream to downstream flow of rivers in Toyama (Japan) using three-dimensional excitation-emission matrix fluorescence spectroscopy.

Sazawa K, Tachi M, Wakimoto T, Kawakami T, Hata N, Taguchi S, Kuramitz H - Int J Environ Res Public Health (2011)

Bottom Line: However, the correlations between the RFI values for other four peaks and the DOC concentration were below 0.287.It was clarified that the great increase of RFI values in peak A and peak T from river water located in urban area showed high concentration of PO(4)-P and Fe(3+), and low N/P ratio due to the high biological activities.The values of fluorescence index (FIX) and biological index (BIX) were as high as 1.60 and 0.72, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering for Research, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan. d1071303@ems.u-toyama.ac.jp

ABSTRACT
The dissolved organic matter (DOM) is one of the important factors for controlling water quality. The behavior and constitutions of DOM is related to the risk of human health because it is able to directly or indirectly affect the behavior, speciation and toxicity of various environmental pollutants. However, it is not easy to know the contents of DOM components without using various complicated and time consuming analytical methods because DOM is a complex mixture and usually exists at low concentration. Here, we describe the fluorescence properties of DOM components in water samples collected from four rivers in Toyama, Japan by means of the three-dimensional excitation-emission matrix (3DEEM) fluorescence spectroscopy. In order to evaluate the alterations of DOM components in each of the river during the flow from upstream to downstream, the patterns of relative fluorescence intensity (RFI) at six peaks which are originated from fluorophores including humic-like and protein-like components were investigated. The changes in the patterns of RFI values at each of the peak and the concentration of dissolved organic carbon (DOC) for each river water sample were discussed in connection with the differences of land use managements and basic water quality parameters, such as pH, EC, turbidity, Fe(3+), T-N, NO(3)-N, T-P, PO(4)-P, chlorophyll a, DOC and N/P ratio. The DOC concentrations in the water samples collected from these rivers were relatively low (0.63-1.16 mg/L). Two main peaks which have a strong RFI value expressed a positive correlation with the DOC concentration (r = 0.557, 0.535). However, the correlations between the RFI values for other four peaks and the DOC concentration were below 0.287. The alterations of DOM components during the flow of a river from upstream to downstream were investigated from the changes in the patterns of RFI values for six fluorescent peaks. It was clarified that the great increase of RFI values in peak A and peak T from river water located in urban area showed high concentration of PO(4)-P and Fe(3+), and low N/P ratio due to the high biological activities. The values of fluorescence index (FIX) and biological index (BIX) were as high as 1.60 and 0.72, respectively.

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An example of the 3DEEM fluorescence spectrum for the river water sample collected from site 4 of Oyabe River. The bar chart next to the graph indicates contour intervals of the fluorescence intensity in the quinine sulfate normalization (QSU).
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f3-ijerph-08-01655: An example of the 3DEEM fluorescence spectrum for the river water sample collected from site 4 of Oyabe River. The bar chart next to the graph indicates contour intervals of the fluorescence intensity in the quinine sulfate normalization (QSU).

Mentions: The optical properties of fluorescence dissolved organic matter in the river water samples were characterized from the point of intensity and position of fluorescence peaks obtained from 3DEEM spectrum. As an example, Figure 3 shows the 3DEEM spectrum and the peak positions (peak C, peak A, peak M, peak N, peak B and peak T) for the water sample obtained from Oyabe River’s site 4.


The evaluation for alterations of DOM components from upstream to downstream flow of rivers in Toyama (Japan) using three-dimensional excitation-emission matrix fluorescence spectroscopy.

Sazawa K, Tachi M, Wakimoto T, Kawakami T, Hata N, Taguchi S, Kuramitz H - Int J Environ Res Public Health (2011)

An example of the 3DEEM fluorescence spectrum for the river water sample collected from site 4 of Oyabe River. The bar chart next to the graph indicates contour intervals of the fluorescence intensity in the quinine sulfate normalization (QSU).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3108133&req=5

f3-ijerph-08-01655: An example of the 3DEEM fluorescence spectrum for the river water sample collected from site 4 of Oyabe River. The bar chart next to the graph indicates contour intervals of the fluorescence intensity in the quinine sulfate normalization (QSU).
Mentions: The optical properties of fluorescence dissolved organic matter in the river water samples were characterized from the point of intensity and position of fluorescence peaks obtained from 3DEEM spectrum. As an example, Figure 3 shows the 3DEEM spectrum and the peak positions (peak C, peak A, peak M, peak N, peak B and peak T) for the water sample obtained from Oyabe River’s site 4.

Bottom Line: However, the correlations between the RFI values for other four peaks and the DOC concentration were below 0.287.It was clarified that the great increase of RFI values in peak A and peak T from river water located in urban area showed high concentration of PO(4)-P and Fe(3+), and low N/P ratio due to the high biological activities.The values of fluorescence index (FIX) and biological index (BIX) were as high as 1.60 and 0.72, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering for Research, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan. d1071303@ems.u-toyama.ac.jp

ABSTRACT
The dissolved organic matter (DOM) is one of the important factors for controlling water quality. The behavior and constitutions of DOM is related to the risk of human health because it is able to directly or indirectly affect the behavior, speciation and toxicity of various environmental pollutants. However, it is not easy to know the contents of DOM components without using various complicated and time consuming analytical methods because DOM is a complex mixture and usually exists at low concentration. Here, we describe the fluorescence properties of DOM components in water samples collected from four rivers in Toyama, Japan by means of the three-dimensional excitation-emission matrix (3DEEM) fluorescence spectroscopy. In order to evaluate the alterations of DOM components in each of the river during the flow from upstream to downstream, the patterns of relative fluorescence intensity (RFI) at six peaks which are originated from fluorophores including humic-like and protein-like components were investigated. The changes in the patterns of RFI values at each of the peak and the concentration of dissolved organic carbon (DOC) for each river water sample were discussed in connection with the differences of land use managements and basic water quality parameters, such as pH, EC, turbidity, Fe(3+), T-N, NO(3)-N, T-P, PO(4)-P, chlorophyll a, DOC and N/P ratio. The DOC concentrations in the water samples collected from these rivers were relatively low (0.63-1.16 mg/L). Two main peaks which have a strong RFI value expressed a positive correlation with the DOC concentration (r = 0.557, 0.535). However, the correlations between the RFI values for other four peaks and the DOC concentration were below 0.287. The alterations of DOM components during the flow of a river from upstream to downstream were investigated from the changes in the patterns of RFI values for six fluorescent peaks. It was clarified that the great increase of RFI values in peak A and peak T from river water located in urban area showed high concentration of PO(4)-P and Fe(3+), and low N/P ratio due to the high biological activities. The values of fluorescence index (FIX) and biological index (BIX) were as high as 1.60 and 0.72, respectively.

Show MeSH
Related in: MedlinePlus