摩周湖水中ニッケル及びバナジウム濃度の深度プロファイルと大気経由人為起源ニッケル及びバナジウム供給の可能性
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摩周湖は，国連環境計画GEMS/Water（Global Environment Monitoring System/Water）プログラムのベースラインモニタリングステーションとして登録されている日本で唯一の湖である．本研究では，摩周湖水中ニッケル濃度の深度プロファイルを明らかにし，ニッケルの供給源に関する知見を得ることを目的に検討を行った．その結果，成層期の表層湖水中ニッケル濃度は温度躍層より深部の湖水中濃度に比べて高く，湖岸の降雨試料及びカルデラ壁上部の積雪試料中ニッケル濃度は，表層湖水中濃度より更に高いことを明らかにした．これらの傾向はバナジウム濃度にも見られた．雪試料中ニッケル濃度とバナジウム濃度の比は，石油燃焼ばい塵中の両元素濃度比の報告値と一致した．一方，温度躍層深度でニッケル濃度の高濃度異常が観察された．湖水中両元素濃度の深度分布挙動，雨及び雪試料中の両元素濃度と湖水中濃度との比較を通して，湖水中ニッケルの一部は化石燃料燃焼排気が起源と考えられる粒子状物質として，大気経由で摩周湖に供給されている可能性を示した．The determination of trace nickel in water samples was conducted by isotope dilution-microwave induced plasma mass spectrometry (ID-MIP-MS) to clarify the concentration-depth vertical profiles of nickel in Lake Mashu (maximum water depth : 212 m), Japan. This lake serves as the Baseline Station of the United Nations GEMS/Water (Global Environment Monitoring System/Water) Programme. The concentrations of nickel in the lake water samples decreased with depth from 0.3 m (surface) to 50 m (quarter of the maximum water depth) water depths. The nickel concentrations in rain- and snow-water samples retrieved at the lakefront and the wall of the caldera lake were higher than those in the surface lake water (0.3 m) samples. This phenomenon was also observed for the concentrations of vanadium in those water samples. The concentration ratio of vanadium to nickel of the snow sample is comparable in magnitude to the reported values in the particulate matter samples originating from fossil fuel combustion. Anomalously high concentrations of nickel in lake water at the thermocline depth were observed in September of 2007 and 2009. The sedimentation process was considered to be responsible for these phenomena since the density and the coefficient of viscosity increase drastically at the thermocline depth, and they would cause a decrease of the sedimentation velocity of the particulate matter containing nickel. The concentrations of nickel as well as vanadium in the water samples support the possibility of the input of anthropogenically derived particulate matter containing both nickel and vanadium, presumably originating from fossil-fuel combustion, into Lake Mashu.
- 公益社団法人日本分析化学会の論文
公益社団法人日本分析化学会 | 論文
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