1,3-ジフェニルグアニジニウム存在下2-ブロモ-4,5-ジヒドロキシアゾベンゼン-4'-スルホン酸ナトリウムによるガリウム(III)の溶媒抽出-吸光光度定量

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タイトル別名
  • １，３‐ジフェニルグアニジニウム存在下２‐ブロモ‐４，５‐ジヒドロキシアゾベンゼン‐４′‐スルホン酸ナトリウムによるガリウム（ＩＩＩ）の溶媒抽出‐吸光光度定量
  • Solvent extraction and spectrophotometric determination of gallium(III) with sodium 2-bromo-4, 5-dihydroxyazobenzene-4'-sulfonate in the presence of 1, 3-diphenylguanidinium
  • 1 3 ジフェニルグアニジニウム ソンザイカ 2 ブロモー4 5 ジヒドロキシ

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抄録

A method is described for the spectrophotometric determination of gallium(III), which is based on the extraction of gallium(III)-2-bromo-4, 5-dihydroxyazo-benzene-4'-sulfonate (BDAS) complex into 1-butanol in the presence of 1, 3-diphenylguanidinium(DPG) salt. The extraction species has an absorption maximum at about 495 nm, and a constant absorbance is obtained in the pH range 5.7 to 6.2. The procedure is as follows: To a sample solution containing up to 11μg of gallium(III) in a 50 ml separatory funnel were added 3 ml of a 1.0 ×10-3 M BDAS solution and 5 ml of 0.17 M DPG solution which had been adjusted to pH 5.9 with hydrochloric acid and hexamethylene-tetramine solutions. The solution was diluted with water to 20.0 ml and shaken for 5 min with 10.0 ml of 1-butanol. The absorbance of the organic phase was then measured at 495 nm using the reagent blank as a reference. Under the optimum condition, a linear relationship between the absorbance of the organic phase and the gallium(III) content of the aqueous phase is obtained up to 11μg gallium(III) per 20.0 ml. The molar absorptivity of the extracted species is 5.5 ×104 cm-1 mol-1 1 at 495 nm. Iron(III), indium(III), aluminum(III), titanium(IV), zirconium (IV), tungsten(VI), and molybdenum(VI) interfered with the determination of gallium (III) even when present in equimolar amounts that of gallium(III). The interferences from aluminum and thorium (IV) can be eliminated by the addition of sodium fluoride. The composition of the extracted species is gallium (III) : BDAS : DPG = 1 :2 : 2.

収録刊行物

  • 分析化学

    分析化学 28 (6), 385-388, 1979

    公益社団法人 日本分析化学会

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