Structural Features and Fe(II)-Binding Capacities of Humic Acids from Reservoir Sediments

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Masami Fukushima³  Keishi Otsuka¹  Yasunari Kawabe²  Hisanori Iwai³  Naotaka Fujisawa³  Ken Furubayashi³  Mitsuo Yamamoto⁵  Shigekazu Horiya⁴  Takeshi Komai² 

[1] Nippon Steel Kankyo Engineering Co., Ltd.;National Institute of Advanced Industrial Science and Technology (AIST);Laboratory of Chemical Resources, Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University;Eco-Green Co., Ltd.;Graduate School of Frontier Sciences, The University of Tokyo

关键词: Sediment;    Reservoir;    Humic Acid;    Binding Capacity;    Iron;   

DOI  :  10.1252/jcej.11we211

来源: Maruzen Company Ltd

【 摘 要 】

References(32)Cited-By(1)Reservoirs frequently require dredging to remove accumulated sediment. This sediment is currently unused, but represents a possible source of humic acids (HAs) that have potential as iron-binding supplements in fertilizers. In order to evaluate the utility of these materials, we investigated the structural features and Fe(II)-binding constants or capacities of some HAs obtained from reservoir sediments. The histidine content in the HAs was correlated to the Freundlich binding constant for an Fe(II)-HA complex, indicating that indole moieties in histidine function as strong binding sites for Fe(II). The binding capacities (2.2–3.2 mmol g−1) indicated that the HAs have the capacity to be loaded with 12–18% Fe(II), comparable to the iron content of previously reported Fe fertilizers that employ HAs from other sources (2–17%). The Fe(II)-binding capacities were positively correlated with the content of phenolic hydroxyl groups. In addition, the positive correlation between Fe(II)-binding capacity and vanillyl moieties in the HAs indicates that 3,4-dihydroxybenzene and/or benzoic acid derivatives also serve as Fe(II) binding sites.

【 授权许可】

Unknown