Volume 3, Issue 7 (July 2006)
Effect of Acid Treatment Agent of Sea Laver on Geoenvironmental Properties of Tidal Flat Muds in the Ariake Sea
Recently the amount of catch of some specific benthos (e.g., shells) in the Ariake Sea of Japan has reduced dramatically. Researchers are questioning if it is the acid treatment practice undertaken in the Ariake Sea tidal flats that changed the geoenvironmental properties of the tidal flat muds, and consequently caused impacts on the benthos living in the muds. However, so far, relatively few detailed studies have been done in this regard. The purpose of this study is to investigate the effect of acid treatment practice on the geoenvironmental properties of muds in the Ariake Sea tidal flats. The field investigation data as well as laboratory test data are presented. It is found that as a consequence of the acid treatment practice, considerable reduction of salt concentration and pH of the muds has taken place. Furthermore, the measured increased sulfide content of the muds indicate that the acid treatment practice in the tidal flats of the Ariake Sea may have produced serious consequences for some benthos inhabiting the shallow depth of the muds.