The method is based on the resiliency of the open-cell polyurethane foam filling used in a pulsing bed column. A liquid anion
exchanger containing I2 has been used as a hydrophobic organic phase immobilized in the polyurethane foam matrix. Forced flow of the mobile phase
during successive pulsing of the column bed results in high preconcentration factors with practically quantitative separation
yields. The pulsated column technique may also be conveniently automated. It can be utilized most advantageously for the rapid
determination of low activity radioiodine in environmental waters mainly in routine field analysis.