IMPROVEMENTS IN USE OF CHELEX-100 RESIN FOR DETERMINATION OF COPPER, CADMIUM AND IRON IN SEA-WATER

Tests have been carried out for copper and iron to determine the capacity of Chelex-100 resin in its “sea form”, using a constant quantity of resin and variable volumes of sea water. For copper an asymptotic capacity curve is found analogous to the cadmium curve reported earlier, while for iron a maximum is observed. As Chelex-100 in its “sea form” appears useful for the determination of cadmium, but not for that of copper and iron, a preconcentration procedure utilising the Chelex-100 in its H+ form is proposed. Using batch equilibration and a practical sea water/exchanger ratio, good recoveries and low blank values were obtained. The method was tested for sea water reference material. © 1990, Taylor & Francis Group, LLC. All rights reserved.