Continuous-flow fractionation of selenium in contaminated sediment and soil samples using rotating coiled column and microcolumn extraction

► We examine the dynamic fractionation of selenium form soils by sequential extraction. ► A four-step procedure proposed by Ponce de León et al. was used. ► Two approaches (RCC; microcolumn) with continuous supply of extractant were compared. ► RCC extraction results in more effective recovery of environmentally relevant Se forms.