2024-03-29T02:20:54Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/675972022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Interactions of dissolved humic substances with oppositely charged fluorescent dyes for tracer techniquesHafuka, AkiraDing, Qing1000040515334Yamamura, Hiroshi1000030348825Yamada, Koji1000080326636Satoh, Hisashiopen access© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 InternationalTracerStern–Volmer plotFluoresceinRhodamine 6G510To investigate interactions between oppositely charged fluorescent dyes and dissolved humic substances, fluorescence quenching of fluorescein and rhodamine 6G with dissolved humic substances was performed. Binding coefficients were obtained by the Stern–Volmer equation. The fluorescence of rhodamine 6G was largely quenched by the addition of humic acid and a non-linear Stern–Volmer plot was obtained. This strong quenching may be caused by the electrostatic interaction between cationic rhodamine 6G and humic acid and strengthened by the hydrophobic repulsion. In contrast, the quenching and interactive effects of dissolved humic substances for fluorescein were relatively weak.Elsevier2015-11-15engjournal articleAMhttp://hdl.handle.net/2115/67597https://doi.org/10.1016/j.watres.2015.08.039263186520043-1354Water Research85193198https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/67597/1/Revised%20Manuscript_clean_Hafuka.pdfapplication/pdf865.13 KB2015-11-15https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/67597/2/Supplementary%20data_Hafuka.docxapplication/vnd.openxmlformats-officedocument.wordprocessingml.document119.42 KB2015-11-15