Preconcentration of Trace Metals in Seawater Matrix for Inductively Coupled Plasma Atomic Emission Spectrometry

J. M. LO, Y. P. LIN, K. S. LIN
1991 Analytical Sciences  
In this study, a two-step preconcentration procedure is proposed to be used in conjunction with ICP-AES for the determination of trace metals in seawater. The two-step preconcentration involves extraction of trace metals from seawater with dithiocarbamate (DTC) into chloroform followed by back-extraction with a Pd2+ solution. The extraction could concentrate the trace metals by forming a chelate with DTC with a high enrichment factor obtained with the large phase volume ratio. The
more » ... n agent Pd2+ is selected because the extraction constant of Pd(DTC)2 is the largest and much higher than most of the other metal dithiocarbamates. The enrichment factor could be further enhanced at the back-extraction step with a large phase volume ratio. Finally, the aqueous solution containing simply the enriched metals and some of the nonreacted Pd2+ was taken for ICP-AES.
doi:10.2116/analsci.7.455 fatcat:jselembsa5djjonqo66ludl4nm