Physical and Instrumental Analysis

Surface tension of compound varies with solution concentration. The relations between surface tension and solution concentration are presented in Fig. 6.1. 

Collectors and frothers are usually heteropolar organics. And some of them are typical surfactants. As discussed in Chap. 4 (Volume 1), the relations between surface tension and solution concentration of surfactant can be described by the following formula  

In general, the change of surface tension is proportional to the solution concentration at low reagent concentration  

Potentiometric titration is based on the relation between electrode potential of ion and solution concentration of surfactant  

When the metal ion is titrated with reagent, electrode potential of ion suddenly jumps at the endpoint of the titration. Conductometric titration is used to the change 

---