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Behavior of Elements in the Takahashi, Japan River Basin¹

ABSTRACT

Concentrations of 22 elements in suspended and dissolved solids in rivers, various sieved particles, and interstitial waters of dam sediments were determined in the Takahashi River Basin on whose estuary stands the Mizushima industrial area, one of the biggest in Japan. In this basin, because of the increased atmospheric pollution, the input of the volatile elements Zn, Cd, Sn, Pb, and Ag from the atmosphere was found to be markedly greater than the theoretical concentration derived from the basin rocks. Copper, chromium, cobalt, iron, nickel, and manganese showed about the same tendencies. These elements were already enriched, even in suspended solids of waters collected near the watershed. Thus, it is suggested that the enrichments of trace elements in suspended solids must occur not only after being suspended in river water, but also in fine solids of topsoil of the watershed. Thus, the increase of trace elements delivered from the atmosphere must bring about the great enrichments in suspended and dissolved solids in river as well as in topsoil and its interstitial water of the river basin.

Key Words: suspended solids • dam sediments • enrichment factor

¹ Contribution from the Inst. for Agric. and Biological Sci., Okayama Univ., Kurashiki 710, Japan.

² Geochemist and Environmental Scientist, respectively.

Received for publication September 7, 1982.