Molecular weight and trace metal distributions in fulvic and humic acid fractions of coastal marine sediments |
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| Authors: | Shizuko Hirata |
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| Institution: | 1. Government Industrial Research Institute, Chugoku, 737-01, Hiro-machi, Kure, Japan
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| Abstract: | Molecular weight and trace metal distributions of fulvic and humic acid fractions of marine sediments from the Seto Inland Sea were investigated by using a gel filtration technique in combination with atomic absorption and emission spectrometries. A binary molecular weight distribution was found both in the fulvic acid fraction and in the humic acid fraction. The fulvic acid fractions with molecular weights of less than 1.5×103 and of 5×103?104 accounted for 38–57 % and 25–41 % of the total fulvic acids, respectively, and the humic acid fractions with molecular weights of 102?104 and of over 2×105 accounted for 58–73 % and 16–27 % of the total humic acids, respectively. The components with molecular weights of over 1.5×103 contained 54 %, on average, of the Fe, Zn and Cu in the fulvic acid fraction, and the components with molecular weights of over 104 contained 58 %, on average, of these metals in the humic acid fraction. |
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