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To overview the stream water chemistry in Japan, we conducted systematic stream water sampling and chemical analyses as the Japan-Wide Stream Monitoring (JWSM) 2003. The total numbers of 1278 samples from head water streams from all over Japan were analyzed in this study. The Japanese average values and concentrations of E.C., pH, Cl-, NO3-, SO42-, Anion deficit (HCO3-),
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Konohira et al. (2006) studied this question.
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