Pre-concentration efficiency of chelex-100 resin for heavy metals in seawater. Part 1. Effects of pH and Salts on the Distribution Ratios of Heavy Metals
Journal
Analytica Chimica Acta
Journal Volume
211
Journal Issue
C
Pages
257-270
Date Issued
1988
Author(s)
Abstract
The chelating characteristics of Chelex-100 resin were studied for selected heavy metals in seawater medium. The results of batch equilibrium and breakthrough experiments show that the metal-chelating efficiency of the resin is lower in seawater than in freshwater. These differences are caused by the complicated speciation of heavy metals in seawater medium and by the high concentrations of magnesium and calcium present which act as competitors to heavy metal ions. The optimal pH values for column operation are strongly affected by the salt matrix. Careful choice of experimental conditions is necessary to avoid losses of cadmium and manganese from seawater. For better performance, seawater samples should be adjusted to pH 6-7 before loading onto a Chelex-100 column. © 1988.
SDGs
Type
journal article