@misc{oai:repo.qst.go.jp:00070400, author = {Takata, Hyoe and Aono, Tatsuo and Tagami, Keiko and Uchida, Shigeo and 高田 兵衛 and 青野 辰雄 and 田上 恵子 and 内田 滋夫}, month = {Feb}, note = {To investigate the effect of salinity and dissolved organic matter (DOM) on the partitioning of cobalt (Co) between dissolved and particulate phases during estuarine mixing, concentrations of Co were determined in surface waters from the Sagami River to Sagami Bay. This metal showed non-conservative mixing behavior with low or mid-salinity maxima. Distribution coefficients (Kd) of Co, which describes particle-water interactions of Co, decreased with increasing salinity, resulting from the competing and complexing effects of major ions in seawater and DOM. Thus, a laboratory experiment was undertaken by introducing riverine suspended particulate matter into estuarine seawater with/without ultra violet (UV)-irradiation to elucidate the effect of DOM in the particle-water interactions. The Kd in the estuarine seawater including DOM, was lower than that in the UV-irradiated estuarine seawater. This result indicates that complexation of Co with dissolved organic ligands is also important for particle-water interactions of Co. This work has been partially supported by the Agency for Natural Resources and Energy, the Ministry of Economy, Trade and Industry (METI), Japan., Aquatic Sciences Meeting}, title = {Effect of salinity and dissolved organic matter on the partitioning of cobalt in a temperate estuary}, year = {2011} }