The Jones reductor can be made to assume a steady state of operation in the reduction of ferric sulfate. Its behavior under such conditions strongly indicates that the rate limiting process is the diffusion of ferric ion through a static film of solution around the solid particles. This is particularly evidenced by the exponential dependence of the extent of reduction on the square root of the flow rate. The behavior of the reductor as a function of zinc ion concentration, zinc amalgam particle size, and temperature, also agrees with this result.
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