瀬田川水中の溶存アルミニウム濃度の一年間の変化(2)

概要

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　The　temporal　variation　of　the　cencentratien　of　dissolved　aluminum　in　the　Seta　River　fromMarch，2001　to　February，2002　was　observed　on　a monthly　basis．　The　dissolved　aluminum　was　determined by　flow　injection　analysis　using　fluorescent　detection　of　an　aluminum-lumogallion　complex． The　increase　in　the　concentration　of　the　dissolved　aluminum　in　the　summer　was　observed again．　The concentration　of　dissolved　aluminum　related　more　closely　to　the　pH　determined　on sitethan　to　the　water　temperature．　The　concentration　change　during　one　month　was　examined　using filtered　and　untreated　samples　preserved　in　a　thermostated　bath　at　30°C．　In　every　month　except December,　the concentration　decrease　was　found　to　be　zero　or　lower　in the　filtered　sample,　whlleit　was　greater　in　the　untreated　sample．　This　resuit　means　that　the　suspended　particulate　matter, as　well　as　sample　pH,　play　an　important　role　in　the　seasonal　concentration　change　of　dissoived aluminum　in　the　Seta　River,　while　the　change　is　independent　of　the　water　temperature．
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