Evaluation of River Water by Dissolved Organic Component.

Gamma ray decomposition of dissolved organic substances in river water without compositional change of metallic elements.

A river water sample was irradiated with 60Co gamma-rays under aerobic conditions, and the changes of the organic substances in the sample were examined by the analyses of the dissolved organic carbon (DOC), organic composition, UV spectrum and molecular-weight distribution. By the irradiation, the DOC decreased with irradiation dose following the first-order kinetics. In addition, the changes ...

Photomineralization and photomethanification of dissolved organic 1 matter in Saguenay River surface water 2

Photomineralization and photomethanification of dissolved organic matter in Saguenay River surface water

Rates and apparent quantum yields of photomineralization (AQYDOC) and photomethanification (AQYCH4) of chromophoric dissolved organic matter (CDOM) in Saguenay River surface water were determined at three widely differing dissolved oxygen concentrations ([O2]) (suboxic, air saturation, and oxygenated) using simulated-solar radiation. Photomineralization increased linearly with CDOM absorbance p...

Photodegradation of fluorescent dissolved organic matter in river waters

*Corresponding author (e-mail: [email protected]) *Present address: Field Science Education and Research Center, Kyoto University, Kitashirakawa, Oiwake, Kyoto 606-8502, Japan. **Present address: Institute of Geochemistry, The Chinese Academy of Sciences, 46 Guanshui Road, Guiyang/Guizhou 550002, China. †Present address: NPO Mori-no-za, Ina 396-0011, Japan. ‡Present address: Graduate ...

Influence of dissolved organic matter on dissolved vanadium speciation in the Churchill River estuary (Manitoba, Canada).

Diffusive gradients in thin films (DGT) devices were used to investigate the temporal and spatial changes in vanadium (V) speciation in the Churchill estuary system (Manitoba). Thirty-six DGT sets and 95 discrete water samples were collected at 8 river and 3 estuary sites during spring freshet and summer base flow. Dissolved V concentration in the Churchill River at summer base flow was approxi...