Gadolinium Anomaly in the Distributions of Rare Earth Elements Observed for Coastal Seawater and River Waters around Nagoya City

摘要: Coastal seawater and river water samples were collected near Nagoya port, located in the coastal area of Ise Bay, six rivers around City. The rare earth elements (REEs) these determined by inductively coupled plasma mass spectrometry (ICP-MS) with chelating resin preconcentration. concentrations all REEs except for Pm could be at concentration level from sub-ng L - 1 to 10 ngL . In order examine relative variations, REE patterns estimated normalizing those Post Archean Average Australian Shale (PAAS). Significantly positive Gd anomalies observed waters down urban areas as well seawater. Such especially remarkable sewage treatment facilities Tenpaku river. It was, thus, concluded that artificially caused anthropogenic sources mainly due recent use a gadolinium compound contrast reagent magnetic resonance imaging (MRI) medical diagnosis.