Experimental methods diaphragm cell

Experimental methods to determine diffusivity. Methods to determine the diffusivity of biological solutes are similar to those discussed previously in Section 6.3 with some modifications. In the diaphragm diffusion cell shown in Fig. 6.3-1, the chamber is made of Lucite or Teflon instead of glass, since protein molecules bind to glass. Also, the porous membrane through which the molecular diffusion occurs is composed of cellulose acetate or other polymers (G5, G6, Kl). 

Depending upon the form of the cell, the connection with the standard cell can be made by means of a siphon or other method. Of - course the electrolyte of the normal electrode must not react appreciably with that of the experimental cell, and in most cases it will be of value to separate both, by a suitably adjusted diaphragm. 

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