| abstract |
[PROBLEMS] To stably supply iron necessary for the growth of aquatic organisms in water in the state of iron ions (Fe 2+ , Fe 3+ ) so as not to be oxidized by oxygen in water to become iron hydroxide. It is an object of the present invention to provide an iron ion supply material that can be used. An iron ion supply material for supplying dissolved iron ions into water by being immersed in water, comprising an iron content and a fruit acid and / or a fruit acid compound as a chelating agent. Is done. Further, the iron-containing material, fruit acid and / or fruit acid compound, and a binder may be mixed together and formed into a lump shape. [Selection figure] None |