Spectrophotometric Determination Of Zirconium Research Articles

Spectrophotometric determination of zirconium and hafnium with oxine and the application to the analysis of uranium.

ジルコニウムおよびハフニウムのオキシン抽出光度法を確立した.両者のオキシン錯塩はともにpH4.5～11.3からクロロホルムで定量的に抽出され,極大吸収波長は385mμにあり,3～60μgのジルコニウム,6～120μgのハフニウムを定量できる.種々の陰イオンの影響を検討したが,両者の抽出性に大きな差異をもたらすようなものはなく,全く同じ挙動を示した.本法をウラン中の微量ジルコニウムの定量に応用し,満足すべき結果を得た.ウランは酢酸で,アルミニウムはフッ素イオンでマスクし,pH4.8～5.3から抽出を行ない,抽出液は炭酸塩-シアン塩溶液で洗浄する.385および470mμの両波長で吸光度を測定することにより,ジルコニウムとともに鉄をも同時に定量することができる.

Spectrophotometric determination of zirconium with 9-methyl-2,3,7-trihydroxy-6-fluorone

9-Methyl-2.3.7-trihydroxy-6-fluorone has been used as a new colorimetric reagent for zirconium. The rose-red complex shows maximum absorption, against the reagent blank, at 500 nm and obeys Beer's law from 0.1 to 2.5 ppm. The optimum concentration range is from 0.66 to 2.5 ppm, where the per cent relative analysis error is 2.96. The composition of the complex, obtained from Job's method, indicates that the complex in solution contains the metal and the reagent in a ratio of 1∶1. The instability constant of the complex is 1.07 · 10−6.

Spectrophotometric studies on the zirconium complex of 2-(3,6-disulfo-8-hydroxynaphthylazo)-1,8-dihydroxynaphtualene-3, 6-disulfonic acid

A chromotropic azo dye, DSNADNS, prepared from chromotropic acid and 1-amino-8-naphthol-3,6-disulfonic acid has been found to produce quantitative precipitation of zirconium in acid medium. The blue-violet complex formed is insoluble in all organic solvents commonly used for solvent extraction work, but is soluble in a number of liquid organic bases and solutions of ammonium salts in water showing pink to violet colouration. Spectrophotometric studies as to the nature of the complex in pyridine, triethanolamine ammonium acetate, oxalate and carbonate solutions and the analytical possibility of these solutions have been made. The complex appears to decompose in pyridine, ammonium acetate and ammonium oxalate solutions, but it is fairly stable in ammonium carbonate and triethanolamine solutions. The absorbance peaks of the dye in these solutions occur at 500 and 520 nm respectively, while the complex in triethanolamine and ammonium carbonate both shows absorbance maxima at 540 nm. The solution of the complex in these two solvents obeys Beer's law within a concentration range 4 to 25 mg of zirconium per litre. The molar absorbance coefficients of the complex in triethanolamine and ammonium carbonate are respectively 686 and 823, which indicate poor sensitivity. The solution of the complex in the former solvent is more stable than that in the latter and an analytical procedure for the spectrophotometric determination of zirconium, with little interference from foreign ions, may be developed with ease in the triethanolamine solution.

ウラン中ジルコニウムの光度定量法

ウラン中ジルコニウムの光度定量法

Spectrophotometric determination of zirconium in magnesium-base alloy

Spectrophotometric determination of zirconium in magnesium-base alloy