Trace level water analysis by energy dispersive X‐ray fluorescence

Abstract

Abstract Analysis of dissolved elements in fresh water at concentrations from parts per billion to the high parts per million range can be carried out using 200–500 ml sampling volumes. Preconcentration using ion‐exchange resin‐loaded filter papers is automatically and quickly carried out and the prepared and dried filters analyzed by energy dispersive X‐ray fluorescence analysis. Excitation by a filtered low power tube, subtraction of a blank filter paper spectrum, automatic computer stripping of peak overlaps and removal of spectrum background gives net elemental counts that can be used with linear calibration curves to directly obtain concentration values. The system and approach readily lend themselves to laboratory use as well as unattended operation.