It was found that the
simultaneous quantitative recovery of cadmium and copper ions
on DPC-SBA-15 and DPC-SiO2 could be obtained for sample volume
up to 1500 and 300 mL, respectively. As the elution volume
was 5 mL for cadmium or copper ions, a pre-concentration factor
of 294 for cadmium and 291 for copper was obtained by assuming
a recovery greater than 97% and 98% for cadmium and copper ions,
respectively. The preconcentration factor for simulate determination
of cadmium or copper ions on DPC-SiO2 is 58.2 with recovery
greater than 97%.