Collection of Iron(III) from Homogeneous Aqueous Solutions on Membrane Filters Using Chromazurol B with Triton X-100

Abstract

A remarkable improvement in the sensitivity and accuracy of analytical instruments has required the development of convenient pretreatment methods for determining a trace and/or micro component. The separation and/or concentration, and the direct determination of minor components, such as impurities in various materials, is often interfered by the major component as background formed from the material body. For eliminating such interferences, various methods, including liquid-liquid extraction, precipitation, adsorption and ion-exchange, have been proposed as pretreatment methods for determining the trace element. These methods have some difficulties to be applied for the removal a large amount of interfering elements; for example, the impurity may be lost by simultaneous adsorption in the adsorption and ion-exchange methods, and coprecipitation in the precipitation method. Recently, a new technique was developed for collecting a metal complex or an ion pair as a precipitate on a membrane filter from an aqueous solution by filtration under suction. [1][2][3][4][5][6][7][8][9][10][11] If the direct collection of a metal complex or an ion pair from a homogeneous aqueous solution can be conducted by membrane filtration, this technique can be applied to a rapid and convenient separation method of the major component 12 and a simple concentration method of the minor constituent as a pretreatment method for its determination.The reagents used for separating the major component as a metal complex are not always suitable for determining the trace element in analyzing the impurity of metallic materials. It is preferred that they cause no interference in the determination of the impurity, and can at least be easily removed by a simple operation. Chromazurol B (CAB), one of the triphenylmethane dyes, has low solubility in water, and can be easily precipitated from an aqueous solution, and also extracted into an organic solvent, such as benzene in a low-pH range. This reagent resembles Chromazurol S (CAS) in molecular structure, except for the absence of a sulfonic group, and can similarly react with the same metal ion. Chromazurol B and Chromazurol S were used for collecting beryllium(II) and aluminum(III) on a membrane filter, followed by solid-phase spectrometry. 13,14 In this study, by taking such chemical properties of CAB into account, the availability of this reagent was examined as a collecting reagent for iron(III). Since the reagent and its complex with iron(III) were precipitated from an aqueous solution, a non-ionic surface-active reagent, polyethylene glycol mono[4-(1,1,3,3-tetramethylbutyl)phenyl]ether (Triton X-100), was added to the aqueous solution to obtain a homogeneous solution in this study. Experimental ApparatusA Hitachi U2000 spectrophotometer was used for measuring the absorption spectra and the absorbance at a fixed wavelength of sample solutions and their filtrates. A Hitachi-Horiba F-16 pH meter equipped with a combined glass electrode was used to measure pH of the solution. ReagentChromazurol B ...

Solid‐Phase Extraction of Trace Amounts of Uranium(VI) in Environmental Water Samples Using an Extractant‐Impregnated Resin Followed by Detection with UV‐Vis Spectrophotometry

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