Solid-liquid Separation after Liquid-liquid Extraction. Spectrophotometric Determination of Zinc after Extraction of Its Oxinate with Melted Naphthalene.

摘要

The method of liquid-liquid extraction of zinc oxinate with melted naphthalenefollowed by solid-liquid separation has been reported for the trace analysisof zinc. The optimum conditions on the determination of zinc were establishedas stated below. Zinc oxinate cannot be extracted into benzene or chloroform,but can be easily extracted into melted naphthalene, temperature being at about90°C. It is very stable at this high temperature and can be dissolved in ethylalcohol. The optical absorbancy of the solution against the reagent was measuredat 385 nm to determine the amount of zinc. The proposed method could alsobe applied to the trace analysis of zinc in the presence of interfering majorcomponents which are removed by prior extraction with oxine-benzene solution.