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[Characterization of the groundwater around Saga City].

Groundwater around Saga city was characterized by determining anionic surfactants, trichloroethylene, tetrachloroethylene, silicic acid, phosphates, nitrite and nitrate, ammonia, sodium, magnesium, calcium, and iron in thirty nine samples of well water.The remarkable increase in concentrations of both sodium and magnesium from the northern to the southern areas of Saga city suggested the permeation of sea water from Ariake sea located in the south of Saga city. Correspondingly, there was also a remarkable increase in concentrations of inorganic nutrients such as phosphates and ammonia. Nitrite and nitrate concentrations were low, and ammonia and iron concentrations were relatively high in well waters in the southern part of Saga city. This fact indicated that the groundwater in this area existed in a highly anaerobic condition. Concentration of anionic surfactants was generally low. However some well water showed possible contamination of anionic surfactants. Neither trichloroethylene nor tetrachloroethylene was detected.