製鋼スラグと腐植物質による生態系修復技術の受容性

摘要

The combination of steel slag and humic acids has an important role that the migration of essential elements, particularly iron and nutrients can be promoted in the aquatic environment. Humic substances such as fulvic acid and humic acids have functions of the formation of chemical complex with metal elements in the environment. Especially in the structure of fulvic acid, iron and humic matter have relatively strong linkage to form a chemical structure of iron-fulvic substances which can dissolve in water phase and be easily taken in plants and organisms as an essential element of iron. A kind of humic substances is considered to be very effective to rehabilitate the ecological situation around coastal environment.rnIn this paper we present the methodology of chemical analysis for complex formation between divalent iron and humic substances, obtained from soils, sediments, plants, woods and coal materials. The necessary conditions of eluting humic substances into aquatic environment were experimentally examined using the natural substances modified by pH and Redox control. The properties of long-term stability of humic substances were also investigated under the condition of fresh water and sea water environments. In addition a trial of risk assessment using the original assessment tool was carried out to reveal safer features of this technology. Thus the acceptability of the technology using steel slag and humic substances is discussed on the basis of experimental and risk assessment results.%木材，堆肥，土壌，底質および石炭などの有機炭素を含む天然素材には，多少なりともフルボ酸ヤフミン酸などの腐植物質が含まれている。腐植物質は，自然環境中で金属元素を取り込んで水に村して可溶性の錯化合物となり，安定化した腐植酸の状態で物質循環に寄与している。