Reproducibility:

Problem:

Why would an unstirred solution offer greater reproducibility?

Answer:

Simple undisturbed diffusion is a highly reproducible phenomenon and highly suitable for an analytical application. In a stirred solution the movement of the solution can be highly complex and not always predictable. If eddies form in the stirred solution they are very unreproducible and must be avoided.

Even in a very evenly stirred solution a slight displacement of the electrode can change the flow pattern. Reproducible stirring requires careful cell design and experimentation. The finest stirring is a rotating electrode in a reproducible position in the cell.