Polarography Using Double Complexing Agents as Supporting Electrolyte
スポンサーリンク
概要
- 論文の詳細を見る
Recent polarographic works using double complexing agents are reported. When double complexing agents are used as supporting electrolyte, the following three cases occur. (1) A negatively reducible complex ion of smaller dissociation constant is predominantly formed in the solution. (2) Two complex ions are formed in a mixed base solution, and the negatively reducible complex ion is transfered to the positively reducible complex ion at the electrode surface as the reduction proceeds. (3) A new complex ion of mixed ligand is formed in a mixed base solution. Examples of (1) are as follows : (i) Simultaneous determination of Fe and Ni using the supporting electrolyte composed of 1M NH<SUB>4</SUB>OH-1M NH<SUB>4</SUB>Cl and excess 5-sulfosalicylic acid, or 1 M NH<SUB>4</SUB>Cl-0.5M pyridine and excess 5-sulfosalicylic acid are reported. (ii) Polarographic determination of trace of Bi in the presence of a large amount of Cu was scucessfully carried out by using double complexing agent consisting of 0.1M EDTA, 0.1M KCN and 10% ethanol at pH 9.7 (Fig. 1). Example of (2) is as follows: Polarographic behaviour of UO<SUB>2</SUB><SUP>2+</SUP> in each supporting electrolyte is shown in Fig. 2. Polarogram of UO<SUB>2</SUB><SUP>2+</SUP> using 0.05M EDTA, 0.05M Na<SUB>4</SUB>P<SUB>2</SUB>O<SUB>7</SUB>, 0.3M KCl and 0.01 % gelatin are separated into two waves(Fig. 2b). Some part of the pyrophosphate complex ion is transfered to the EDTA complex ion at the electrode surface as the reduction of EDTA complex ion proceeds. Examples of (3) are as follows : (i) The half-wave potentials of Cu, Bi and Pb are separated by the use of 0.5M Na citrate and 0.01MEDTA (pH 4.5) to -0.09, -0.64 and -1.1V. (vs. SCE), respectively (Fig. 3). (ii) A supporting electrolyte composed of 0.1M EDTA and 0.02M sodium citrate (pH 6.0) is used for the simultaneous determination of Ti and V (Fig. 4). A new Ti EDTA-cit-rate complex ion having mixed ligand is formed in this medium. Both ions give well defined reduction waves, and the half-wave potentials are -0.59 for Ti and -1.3 V. (vs. SCE) for V at pH 6.0 (Table 1). (iii) The base solution composed of 0.1 N HNO<SUB>3</SUB>, 0.005M nitrilotriacetic acid arid 0.04% sodium carboxy methylcellulose is used for the simultaneous determination of Cu and Bi in Pb. As Bi forms a stable complex with nitrilotriacetic acid in this medium, the reduction step of Bi complex ion can be shifted from the copper step cvcn in the prescnce of large amounts of lead. The half-wave potentials of Cu and Bi are -0.004 V. and -0.14 V. (vs. Hg pool), respectively (Table 2). (iv) Simultaneous determination of Sn and Pb using the supporting electrolyte cornposed of 3MNaBr, 0.05M EDTA and 0.008% gelatin (pH 1.3-1.7) are reported (Fig. 5). A new Sn mixed complex using EDTA and Br as a ligand is formed in this medium, On the other hand, Pb is present as a bromide complex ion in this condition (pH 1.3-1.7). The half-wave potentials of Pb and Sn are -0.48 and -0.71V. (vs. SCE), respectively. (v) Sn (IV) in 1 MNaBr, 0.2M oxalic acid and 0.004% gelatin as a supporting electrolyte forms a well defined four electron reduction wave. Polarograms of Sn (IV) using oxalic acid and alkali halide (KCI, NaBr, KI) as double complexing agents are presented in Fig. 6.
- 日本ポーラログラフ学会の論文
著者
関連論文
- メチルイソブチルケトンを用いるビス(8-キノリノラト)銅(II)の溶媒抽出ポーラログラフィー
- メチルイソブチルケトンを用いる溶媒抽出ポーラログラフィー
- 回転カーボンペースト円板電極を用いるチロシンとβ-(3,4-dihydroxyphenyl)-l-alanineの同時定量 : 固体電極を用いるボルタメトリー(第10報)
- グラシーカーボン電極の簡単な作り方
- カーボンペースト電極を用いるチロシンの陽極酸化反応
- モノヨード酢酸の還元波を利用するヨウ素イオンのポーラログラフ分析
- カーボンペースト電極を用いるニッケル(II)EDTAの陽極酸化反応 : 固体電極を用いるボルタメトリー(第5報)
- 固体電極を用いるタリウム(I)イオンの陽極酸化反応 : 固体電極を用いるボルタメトリー(第4報)
- 錯形成剤としてEDTAを用いるタリウム(III)のポーラログラフ分析 : 錯形成剤を用いるボルタメトリー(第3報)
- 6 ポーラログラフ分析
- シュウ酸-臭化ナトリウム複合支持電解質中のスズ(IV)のポーラログラフ波について : 錯形成剤を用いるボルタメトリーの研究(第1報)
- EDTA-NaBr複合支持電解質を用いるスズ(IV),鉛(II)のポーラログラフ法による同時定量 : 錯形成剤を用いるボルタメトリーの研究(第2報)
- MIBKを用いるトリスアセチルアセトナト鉄(III)およびトリステノイルトリフルオロアセトナト鉄(III)の溶媒抽出ポーラログラフィー
- ジメチルホルムアミド-水混合溶媒中のα-ピリジルアゾレゾルシノールおよびコバルトキレートのポーラログラフ的研究〔英文〕
- 非水溶媒中の水分について(ノート)
- 非水溶媒ポーラログラフ法によるα-トコフェリルアセテートの定量(報文)
- カーボンペースト電極の実際
- カーボンペースト電極におけるCo(II)EDTA錯イオンの陽極酸化反応〔英文〕
- カーボンペースト電極の使い方(実験ノート)
- 有機溶媒メチルイソブチルケトンのポーラログラフィーへの適用〔英文〕
- Polarography Using Double Complexing Agents as Supporting Electrolyte
- ハロニトロベンゼンアニオンラジカルのボルタメトリーと電子スピン共鳴〔英文〕
- Polarography and Electron Paramagnetic Resonance of Nitrobenzene Derivatives