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協同抽出を利用する天然水中の超微量成分の予備濃縮/黒鉛炉原子吸光分析(<特集>超微量分析のための前処理と予備濃縮) Preconcentration and graphite furnace AAS determination of ultratrace elements in naturalwaters by utilizing synergistic extraction.(<Special Articles>Pretreatment and Preconcentration for Trace Analysis) 上田, 一正 9808 40019758 40019758 北原, 俊 14633 久保, 勝寿 14634 山本, 善一 14635 協同抽出を利用して天然水中のCd,Mn,Pb,Cu及びCoを捕集分離し,黒鉛炉AAS定量するための基礎的条件を検討した.協同抽出試薬として低濃度(1mM程度)のモノチオテノイルトリフルオロアセトンとトリオクチルホスフィンオキシドを用い,アルカリ及びアルカリ土類元素など,天然マトリックス成分から微量金属を定量的に分離濃縮できた.この抽出液を直接黒鉛炉に供試し,メモリー効果の少ない再現性の良いシグナルを得,迅速,簡単,高感度なAASを確立した.付加錯体のAASへの適用は,灰化過程で金属の揮散防止,黒鉛炉内での酸化物生成の抑制,熱接触面積の拡大などの相乗効果を生ずると考えられ,干渉抑制と同時に増感効果も認められた.本法を河川水の分析に応用し,少量の試料を用い,相対標準偏差10%以内で各金属の高感度定量が可能であった. A simple, rapid and sensitive method for AAS determination of Cd, Mn, Pb, Cu and Co in natural waters has been developed by utilizing synergistic extraction with STTA-TOPO-cyclohexane solution. Trace metals could be quantitatively separated and concentrated from natural water matrix by using a low concentration (1 mM level) of STTA and TOPO. The synergistic extract was directly injected into the graphite furnace and the reproducible absorption signal with little memory effect was obtained. The extracted adduct would produce multipliing effects on the AAS measurement, e. g., the prevention of volatilization of metal on the ashing stage, the depression of metal oxide formation and the extension of thermal contact area in the graphite furnace. Thus, the sensitization effect was recognized, simultaneously the depression of the interferences. The proposed method was applied to the analysis of river water, using a small volume of sample solution, and trace metals were successively determined within the relative standard deviation of 10%. journal article The Japan Society for Analytical Chemistry = 日本分析化学会 1987-11-05 VoR application/pdf 分析化学 = Japan analyst 11 36 728 734 AN00222633 0525-1931 https://kanazawa-u.repo.nii.ac.jp/record/9950/files/TE-PR-UEDA-K-728.pdf http://hdl.handle.net/2297/25037 https://kanazawa-u.repo.nii.ac.jp/records/9950 jpn 10.2116/bunsekikagaku.36.11_728 http://www.jsac.or.jp/index.html http://ci.nii.ac.jp/naid/110002909508/en/ Copyright (c) 1987 日本分析化学会