Abstract
A monthly survey of dissolved concentrations of various trace elements was performed in Lake Biwa. Particulate concentrations of the elements were also measured in early autumn and winter. Based on these results, the geochemical behaviors of trace elements are discussed. The redox-sensitive elements Mn and Fe showed characteristic vertical distribution profiles. Profiles of Mn changed drastically with the progression of the stagnation period. The dynamics of Ba were affected by the redox cycle of Mn. Dissolved V concentration showed a clear seasonal variation. In contrast, dissolved concentrations of Sr, Mo, Cu, Zn, and Ni were almost uniform, i.e., not dependent on the season or the depth. The distribution ratios of these elements between lake water and Mn nodules formed in the lake were calculated to assess their geochemical behaviors.
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