沖縄本島三畳系石灰岩の重金属元素含量(<特集>炭酸塩の地球化学)
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Trace amounts of Cd, Ni, Cu, and Pb in the Triassic limestone samples from the Nakijin-jo Site and Cape Hedo of Okinawa-honto Island were determined by flame atomic absorption spectrophotometry combined with the ammonium pyrrolidinedithiocarbamate (APDC) - 4-methyl-2-pentanone solvent extraction system. Positive relationships were observed between the contents of trace metals (Mn, Ni, Cu, Zn, and Pb) and those of acid-insoluble residues (mainly SiO_2) and Fe. This fact suggests that these metals exist in accessory minerals such as silicates and pyrite in the above limestone samples. On the contrary, no positive correlation was observed between the Cd and Fe contents, indicating that Cd may differ in its behavior from the above metal ions during the deposition and diagenesis of limestones. Cadmium is almost always present as 1 mol dm^<-3> acetic acid-soluble form in the examined samples. This suggests that Cd^<2+> is incorporated into calcite by replacing Ca^<2+> in the lattice. The arithmetic means of Cd in the Nakijin-jo Site and Cape Hedo limestone samples were 0.19 and 0.30 ppm, respectively. The value (0.30 ppm) of the Cape Hedo limestone samples with a small amount of acid-insoluble residues is similar to the average Cd contents of three Middle or Upper Triassic limestones from different localities. The Cd contents of Triassic limestones are lower than those of Permian limestones, but slightly higher than those of Quaternary ones.
- 日本地球化学会の論文
- 2006-08-25
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