Chemical and Physicochemical Characteristics of Dissolved Organic Carbon Circulating in Harmonic Lake Biwa, Japan.

Hori, Toshitaka; Sugiyama, Yuko; Sugiyama, Masahito

doi:10.3739/rikusui.59.39

Cited by 25 publications

(30 citation statements)

References 5 publications

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“…They found that the fraction with adsorptivity to HIO consisted primarily of refractory organic carbon. [4][5][6] However, the dynamics of DOC could not be quantitatively explained by these data alone.…”

Section: Introductionmentioning

confidence: 79%

Characterization of Dissolved Organic Matter Released from Microcystis aeruginosa

et al. 2008

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The contribution of dissolved organic matter (DOM) released from phytoplankton (Microcystis aeruginosa) during cultivation and biodegradation was examined to clarify the causes of the organic pollution of Lake Biwa. Two peaks, peak 2 (retention time (RT) = 32 min) and peak 3 (RT = 35 min), were detected in the algal DOM released from Microcystis aeruginosa during cultivation and biodegradation by gel chromatography with a fluorescence detector (Ex = 340 nm, Em = 435 nm). As these peaks correspond with the peaks detected in the surface water of Lake Biwa, one can conclude that the algal DOM released from Microcystis aeruginosa during cultivation and biodegradation makes a considerable contribution to the refractory organic matter in Lake Biwa. Three fluorescence maxima were observed in the cultivation of Microcystis aeruginosa: a fulvic-like fluorescence peak (peak A) with Ex/Em values of 320/430 nm, a protein-like fluorescence peak (peak C) with Ex/Em values of 280/360 nm, and another peak with Ex/Em values of 240/370 nm. The fluorescence material of peak C has a larger MW than that of peak A. The algal-derived DOM from Microcystis aeruginosa has similar fluorescence to fulvic acid of soil origin but exhibits mainly hydrophilic characteristics. In the biodegradation of Microcystis aeruginosa, a fulvic-like fluorescence peak (peak B) with Ex/Em values of 250/440 nm and a peak with Ex/Em values of 320/380 nm were observed.

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Section: Introductionmentioning

confidence: 79%

Characterization of Dissolved Organic Matter Released from Microcystis aeruginosa

et al. 2008

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“…Using this methodology, act-DOC, which was previously characterized by its adsorptivity to HIO, 25,26 can further be divided into protein-type pro-DOC and carboxylate and carbohydrate-type car-DOC.…”

Section: Characterization Of Doc In Lake Biwa From Continuous Adsorptmentioning

confidence: 99%

“…Hori et al have attempted to characterize organic carbon in Lake Biwa and surrounding rivers according to their adsorptivity to HIO and their reactivity to permanganate oxidant. 25 They found that the fraction with adsorptivity to HIO mainly consisted of refractory organic carbon, which exists at a concentration of 0.5 mg C l -1 evenly in Lake Biwa, and labile organic carbon, that changes with location and depth. Because the former is not found in rivers and streams flowing into the lake, they are considered to have formed inside the lake.…”

Section: Introductionmentioning

confidence: 99%

Chemical Characterization of Organic Carbon Dissolved in Natural Waters Using Inorganic Adsorbents

Sugiyama

Kumagai

2001

ANAL. SCI.

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“…Tomita [33] has shown that the concentration of humic substances in waters from the Seta River, which is an outflow river for Lake Biwa, increased due to heavy rain. Hori et al [34] have shown that no sign of diffusion of DOC from the bottom sediment was observed from the DOC measurements in the lake water. Therefore, older fulvic acids in soil and groundwater may be transported from rivers to the lake in April and October.…”

Section: Factors Controlling Variations In Carbon Isotopesmentioning

confidence: 99%

Variations in Δ14C of humic substances in the Lake Biwa waters

Nagao

Kodama

Aramaki

et al. 2007

Nuclear Instruments and Methods in Physics Research Section B:

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Chemical and Physicochemical Characteristics of Dissolved Organic Carbon Circulating in Harmonic Lake Biwa, Japan.

Cited by 25 publications

References 5 publications

Characterization of Dissolved Organic Matter Released from Microcystis aeruginosa

Characterization of Dissolved Organic Matter Released from Microcystis aeruginosa

Chemical Characterization of Organic Carbon Dissolved in Natural Waters Using Inorganic Adsorbents

Variations in Δ14C of humic substances in the Lake Biwa waters

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