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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Partitioning of cadmium, copper, manganese and iron into mineral and organic fractions in core sediments from the Osaka Bay

Yasushi Kitano, Ryoko Fujiyoshi
Geochemical Journal, Vol. 14, No. 6, P. 289-301, 1980

ABSTRACT

Partitioning of cadmium into five fractions (1M CH3COONH4 soluble, 1M CH3COOH soluble, 30% H2O2 soluble, 0.04M NH2OH·HCl soluble and silsicate lattice fractions) of core sediments from the Osaka Bay has been determined by using selective chemical leaching technique. In addition to cadmium, partitioning of copper, manganese and iron has been also examined as a control. Large amounts of heavy metals (cadmium and copper) are contained in the upper parts of the sediment. The cadmium and copper contents of the sediment are relatively large in the Bay near the industrial area. Cadmium is distributed mainly in 30% H2O2 soluble and silicate lattice fractions. Cadmium leached into 30% H2O2 solution may have been partly derived from ferro-manganese oxide fraction as well as pyrite fraction of the sediment. The amount of cadmium contained in silicate lattice fraction of the sediment in the Osaka Bay is larger than that of silicate rocks collected from land area. 1 M CH3COOH soluble fraction is important for the cadmium content near the surface portion of the sediment. Cadmium dissolved in 1 M acetic acid solution may have been partly derived from acid soluble sulfide fraction of the sediment. Some of cadmium contained in 1 M CH3COOH soluble fraction may have heed derived from ferro-manganese oxide fraction of the sediment.

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