A fast method of zone melting as an aid in analytical chemistry

A new zone-melting apparatus is described which allows relatively high zone speeds up to 100 cm/h. The time required for effective separations is only a few hours so that the apparatus can be used for analytical purposes. The difference between the theoretical and actual distribution coefficients obtained is small; the distribution coefficients of unknown substances in mixtures can thus be derived from the result of zone melting, which offers a means of identification. The apparatus is fully automated and normal freezing is incorporated as a first step. A means of preventing the breakage of the glass tube containers is described. The principles of operation and possible applications are discussed.