Solid-liquid separation after liquid-liquid extraction

• Published in: Bunseki kagaku Vol. 18; no. 3; pp. 398 - 399
• Main Authors: FUJINAGA, Taitiro, KUWAMOTO, Toru, NAKAYAMA, Eiichiro, SATAKE, Masatada
• Format: Journal Article
• Language: English
• Published: Tokyo Japan Science and Technology Agency 1969
• ISSN: 0525-1931
• DOI: 10.2116/bunsekikagaku.18.398

A liquid-liquid extraction of metal chelate with a hot solution followed by a solid-liquid separation was successfully applied to the trace analysis of metals. In the determination of traces of copper, the pH of the sample solution was adjusted to around 6.0, the solution was heated on a hot water bath, shaken vigorously after the addition of a pellet of oxine-diphenyl (0.05 g of oxine in 5.0 g diphenyl solution) to extract copper oxinate into the liquefied diphenyl layer, and allowed to stand still at room temperature. The solidified pellet was washed with water by decantation, dissolved and diluted to a definite volume with chloroform. An aliquot was then taken to an optical cell and the absorbancy at 410 mμ was measured to determine the amount of copper. The Beers' law held with the amount of copper up to 150 μg in 50 ml of original solution. Fig. 1 shows the absorption spectrum of copper oxinate in diphenyl dissolved with chloroform. The method could also be applied to the removal of interfering major components in trace analyses and to the decontamination of radioactive elements. The detailed results will be reported later.