High-Speed Stirring Spectrometry

A simple but effective method to measure the interfacial amount in highly agitated systems is the high-speed stirring method. The principle of this method is that when 

FIGURE 2.11 A simple device for the drop volume method to measure interfacial tension between water and another phase, which is heavier than water. 

FIGURE 2.12 The interfacial adsorption of l,10-phenanthroline(phen) complexes in carbon tetrachloride/water and chloroform/water systems. 

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The solvent-extraction process for metal ions depends intrinsically on the mass transfer to or across the interface and the chemical reaction in the interfacial region. Therefore, the study of the role of the interface is very important for analyzing the real extraction mechanism and for controlling the extraction kinetics. In the early 1980s, the high-speed stirring (HSS) method was developed by Watarai and Preiser [4,5]. Thereafter, some new methods were proposed in our laboratory, which included the two-phase stopped-flow method [6], the capillary plate method [7], reflection spectrometry [8], the centrifugal liquid membrane (CLM) method [9], and the two-phase sheath flow method... 

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