Bulletin of the Society of Sea Water Science, Japan

Cobalt or nickel ferrocyanide was impregnated into an anion-exchange polymer chain grafted onto a commercially available 6-nylon fiber. First, ferrocyanide ions (Fe (CN)₆^4－) were bound to the anion-exchange fiber. Second, the fiber was made to reach with cobalt or nickel ions to form insoluble cobalt or nickel ferrocyanide via precipitation. For comparison, a commercially available anion-exchange bead was used as a support for the impregnation of insoluble cobalt or nickel ferrocyanide. The contents of metal ferrocyanides impregnated onto the fiber were approximately half those impregnated onto the bead. Adsorption isotherms of insoluble cobalt or nickel ferrocyanide-impregnated fiber and bead for cesium ions in seawater correlated well with a Langmuir-type isotherm. The saturation capacity for cesium ions in seawater per gram of insoluble metal ferrocyanides was almost identical between the fiber and the bead.

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Supernatant solutions of jellyfish (Aurelia aurita and Nemopilema nomurai) suspensions are useful for the soilless culture of the common ice plant (Mesembryanthemum crystallinum L.）. The plants were cultivated using supernatant solutions of jellyfish suspensions concentrated by means of in-vacuo heating with a control of edible salt. The culture fluids were prepared by measuring electric conductivity so that concentrations provided a final NaCl concentration of 0.5 or 1 ％（w/v）. After harvesting the common ice plants, they were weighed. Concentrations of inorganic anions, organic acids, and amino acids in the edible portion of the common ice plant were determined using capillary zone electrophoresis （CZE）. Concentrations of Ca, Fe, and Zn in the common ice plant were determined using inductively coupled plasma （ICP） emission spectroscopy. Results were analyzed statistically. Except for nitrate, citric acid, and metal concentrations, no significant differences in other results were observed among the different concentrations of NaCl, the two kinds of jellyfish, and edible salt.

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