About BEPPU HIKARI
About MURANAKA TAKESHI
About 八戸工業大学エネルギー環境システム研究所紀要
About nitrate nitrogen
About isotopic ratio
About COD
About lake pollution
About river
About river pollution
About lake
About nitrogen stable isotope ratio
About tributary
About Lake Ogawara
About Lake pollution
About Water quality research and measurement in general
About River pollution
About 小川原湖
About 湖水
About 流入河川
About 硝酸態窒素
About 窒素安定同位体比