The chemical composition and the cadmium,chromium and vanadium contents of shall-water deposits in Tokyo Bay |
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| Authors: | Masayoshi Ishibashi Shunzo Ueda Yoshikazu Yamamoto |
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| Institution: | (1) Nara University, Nara, Japan;(2) Faculty of Technology, Kanazawa University, Kanazawa, Japan |
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| Abstract: | The major elements and the minor elements cadmium, chromium and vanadium in 12 samples of shallow-water deposits collected
in Tokyo Bay were studied. Average silica content of the deposits is 53.93%, which is approximate to the average of 54.15%
of red clay. Iron (av. 5.67% Fe2O3), titanium (av. 0.71% TiO2), especially manganese (av. 0.87% MnO), are more abundant in the deposits than in the deposits along the entire sea-coasts
of Honshu and of Nanao Bay, Japan. The deposits show higher contents of cadmium (av. 0.61 ppm), the chromium (av. 86 ppm)
and vanadium (av. 79ppm). About 3 to 17 times cadmium and manganese contents compared with those in the deposits along the
sea-coasts of Honshu and of Nanao Bay, Japan was found. Such accumulation, of cadmium and manganese in the deposits is probably
caused by artificial contamination rather than of natural origin. No relation was found between the contents of cadmium, chromium
and vanadium and those of major elements. |
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