Flow configurations for interfacing automatic ion-exchange devices with sequential inductively coupled plasma atomic emission spectrometry: application to trace metal determination in pure alkali metal salts

Abstract

An automatic ion-exchange (AIE) device was used to separate trace constituents from matrix elements in alkali metal salts. The preconcentrated trace elements were eluted and subsequently determined on-line by sequential inductively coupled plasma atomic emission spectrometry. Optimum flow rates for both instruments were achieved by inserting a T-junction between the outlet of the AIE device and the ICP nebulizer. The excess of eluent was trapped, mixed and subsequently nebulized to obtain steady-state analyte signals. Alternatively, the analyte was dispersed using efficient mixing coils. Elution kinetics and dispersion of trace metal ions were studied for standard and alkali metal salt solutions. These flow configurations facilitated on-line multi-element analyses of alkali metal salts.