The studies on the silica species in regional and seasonal change, and on development of measurement in pure water

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The silica concentration and species change according to season by the activity of diatom and circulation of seawater. The silica species were observed in seawater of Tokyo and Sagami Bays. Dimer and linear tetramer were consumed by diatom. In spring, dimer and linear tetramer became very low concentration compared with cyclic tetramer. However, in spring of 2003, which was the year of cold summer, dimer and linear tetramer did not become low. And in fall of 2003, the distribution of dimer and linear tetramer was almost same as those in fall of 2002 and 2004. This indicated that the distribution of dimer and linear tetramer in spring showed the hot summer or not.By this measurement of silica species by FAB-MS, it was difficult to detect these species in pure water. The preparation with high concentration of silica in pure water was developed. From this way, the artificial solution could be reproduced just the same as the river water with high concentration of silica. This high concentration silica solution was examined by FAB-MS and ESI-MS, and observed silica species were compared with each other. The silica species were pass the desolvated process by ESI-MS, therefore, detected silica species changed by dehydration.