Determination of micro amounts of lanthanoids in cast iron after solid–liquid extraction with diethyldithiocarbamate

Abstract

A solid–liquid extraction separation was developed for the determination of total amounts of lanthanoids in cast iron. Various complexing agents and solid solvents were examined. It was found that diethyldithiocarbamate could quantitatively extract iron and other heavy metals into paraffin. The optimum conditions were achieved. Interferences from diverse ions were evaluated. After separation, subsequent spectrophotometric determination of the lanthanoids was carried out. The complexing agents and solid solvents, once used, could be recycled and used repeatedly for further separations.