Distribution Coefficient:

There is a term synonymous to distribution ratio which is known as distribution coefficient (K_d). That is also used to elaborate the distribution of the ion among the solution and the ion exchange resin. It is more or less the same as distribution ratio. This weight distribution coefficient of ion is given by

K d   = Conc.in 1g of the re sin/Conc.in 1mL of the solution

It is only the difference in terminology and it is determined in the same manner as distribution ratio. It is expressed as per gram of the dry resin. It is conditional and dependent on the nature of resin and the conditions prevailing in the solution.