Enhanced Selectivity And Sensitivity For Flow Injection Spectrophotometric Determination Of Cobalt Using Solid Phase Extraction With A 2d Ion-imprinted Adsorbent

Abstract

The present work reports the effectiveness of a 2D imprinting method based on a surface imprinting technique for the development of a selective and sensitive flow sorbent preconcentration system for Co2+ ion determination. Cobalt ions were determined by UV-vis spectrophotometry exploiting the complexation with 1-(2-piridylazo)-2-naphtol (PAN). Based on a coefficient of relative selectivity (k'), the ion-imprinted amino-functionalized silica gel sorbent (ISG), compared with modified but non-imprinted sorbent (MSG) and silica gel (SG), showed a very high selectivity. A limit of detection of 0.51 μg L-1 and precision (n = 10) as a relative standard deviation of 2.63 and 1.50% for Co2+ concentration of 10.0 and 90.0 μg L-1, respectively, were achieved. A comparison of the proposed method with other previously published methods shows advantages in terms of sample consumption, sample throughput, and limit of detection. 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