降水に含まれる無機成分の化学的特徴(第六報)

概要

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The characterization of the precipitation in Yonezawa was investigated and discussed. The precipitation samples from May 1989 to March 1996 in Yonezawa every rainfall and snowfall were analyzed concerning pH, electric conductivity (EC) and concentration of major ions (Na+, K+, NH4+ , Ca2+, Mg2+, Cl-, NO3- and SO42-). The results of the annual data observed in Yonezawa were as fol1ows : (1) the annual means of pH are decreasing down and the one of EC are increasing over gradually every year after 1992 in Yonezawa. This suggests that the atmosphere around us becomes worse. (2) On monthly total concentration of major ions in precipitation, the concentration in spring, March or April became high remarkably. This was dependent on the pollutants from the soil in thaw or yellow sand transported by a west wind. (3) It was found that the precipitation collected in Yonezawa from l989 to 1992 was clearer in three blocks of sampling stations, facing the Sea of Japan, the Pacific Ocean and the Inland Sea of Seto from Phase-II study of Acid Precipitation Survey over Japan by Japan Environmental Agency.
山形大学の論文
1997-01-31