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Once the most significant variables had been chosen, a tiny composite design (Draper-Lin) had been familiar with get their particular optimal values to optimize the enrichment factor. Under these problems, an experimental enrichment element of 49.91 ± 3.95 had been attained after 22 min. Finally, the end result of saline matrix in the enrichment element had been tested as well as the optimized system had been successfully applied to analyse silver concentrations at ultratrace levels, in the ran
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