3.2. Effect of type, concentration and volume of eluent
For the elution of the trace metals adsorbed on the chelating resin, dilute acid solutions having different concentrations and volumes were investigated. For this reason, various elution solutions were used for desorption of the metal ions from the chelating resin. It was found that 25 mL of 3 mol L−1 HNO3 was sufficient for the complete elution of all the metal ions studied and also used as eluent in further experiments.