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Electronic absorption spectra of palladium(II) in concentrated nitric acid solutions

濃硝酸中でのパラジウム(II)の電子吸収スペクトル

藤井 俊行*; 江草 聡一朗*; 上原 章寛*; 桐島 陽*; 山岸 功; 森田 泰治; 山名 元*

Fujii, Toshiyuki*; Egusa, Soichiro*; Uehara, Akihiro*; Kirishima, Akira*; Yamagishi, Isao; Morita, Yasuji; Yamana, Hajimu*

Pd溶存状態評価のため、濃硝酸溶液におけるPd錯体の紫外可視吸収スペクトルを研究した。硝酸と過塩素酸を混合してイオン強度を1, 2, 5Mに保ちながら硝酸濃度を変化させて得た吸収スペクトルを解析することにより、Pdの主たる化学種はPd$$^{2+}$$, PdNO$$_{3}$$$$^{+}$$及びPd(NO$$_{3}$$)$$_{2}$$であることがわかり、錯形成定数$$beta$$$$_{1}$$, $$beta$$$$_{2}$$をそれぞれのイオン強度ごとに算出した。

Palladium complexation in concentrated nitric acid solutions was studied by UV/Vis absorption spectrophotometry. The ionic strength of the solutions was fixed to $$I$$ = 1, 3, or 5 M by mixing of HNO$$_{3}$$ and HClO$$_{4}$$. The major palladium species were found to be Pd$$^{2+}$$, PdNO$$_{3}$$$$^{+}$$, and Pd(NO$$_{3}$$)$$_{2}$$. The formation constant of PdNO$$_{3}$$$$^{+}$$ was determined to be $$beta$$$$_{1}$$ = 1.32 ($$I$$ = 1 M), 1.49 ($$I$$ = 3 M), or 1.47 ($$I$$ = 5 M), while that of Pd(NO$$_{3}$$)$$_{2}$$ to be $$beta$$$$_{2}$$ = 0.45 ($$I$$ = 3 M) or 0.14 ($$I$$ = 5 M).

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パーセンタイル:24.46

分野:Chemistry, Analytical

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