ジクロロエタンに溶解した塩化トリオクチルメチルアンモニウムによるポリアミノカルボン酸陰イオン種の溶媒抽出 Solvent Extraction for Anion Species of Polyaminocarboxylic Acids with Triocthylmethylammonium Chloride in 1,2-Dichloroethane

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The Aliquat 336 (material of ISE) dissolved in 1,2-dichloroethan solvent was used for the solvent extraction of a anion species of triethylentetramine hexa acetic acid (TTHA, H<sub>6</sub>X), diethylenetetraminepentaaceticacid (DTPAH<sub>5</sub>X) and cyclohexanediaminetetraacetic acid (CyDTA). The extraction behavior was examined. The extraction efficiency (%E) was indicated in the enlarge order as CyDTA > EDTA > DTPA > TTHA in the pH range from 4.0 to 12.0. The extraction constants (K<sub><i>n</i></sub><sup>ex</sup>) were calculated by using consecutive dissociation constant (k<sub>m</sub>), overall acid formation constants of polyaminocarboxylic acid. (β<sub>n</sub>). The extraction coefficients of all partitions of the extraction constants of anion species of TTHA are indicated as follows : K<sub>2</sub><sup>ex</sup> = 3.6 × 10<sup>−5</sup>, K<sub>3</sub><sup>ex</sup> = 5.49 × 10<sup>−6</sup>, K<sub>4</sub><sup>ex</sup> = 9.08 × 10<sup>−6</sup>, K<sub>5</sub><sup>ex</sup> = 1.15 × 10<sup>−5</sup>, K<sub>6</sub><sup>ex</sup> = 1.81 × 10<sup>−5</sup>. All partitions of the extraction constants of the anion species of DTPA were also obtained as follows : K<sub>2</sub><sup>ex</sup> = 1.25 × 10<sup>−3</sup>, K<sub>3</sub><sup>ex</sup> = 9.26 × 10<sup>−5</sup>, K<sub>4</sub><sup>ex</sup> = 3.11×10<sup>−4</sup>, K<sub>5</sub><sup>ex</sup> = 5.22 × 10<sup>−4</sup>. All partitions of the extraction constants of CyDTA are also indicated as follows : K<sub>2</sub><sup>ex</sup> = 0.043, K<sub>3</sub><sup>ex</sup> = 0.014, K<sub>4</sub><sup>ex</sup> = 0.02. The steric rearrangement by bonding between the aminocarboxylic acid anion in ligands and the triocthylmethylammonium cation species is important in solvent extraction. It was also found that the steric existence of cycloring in CyDTA affected the extraction.

収録刊行物

  • 分析化学 = Japan analyst

    分析化学 = Japan analyst 61(3), 261-266, 2012-03-05

    公益社団法人 日本分析化学会

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各種コード

  • NII論文ID(NAID)
    10030135457
  • NII書誌ID(NCID)
    AN00222633
  • 本文言語コード
    JPN
  • 資料種別
    NOT
  • ISSN
    05251931
  • NDL 記事登録ID
    023598500
  • NDL 請求記号
    Z17-9
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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