Abstract: A silica gel-bound, imprinted polymer for selective recognition of the diquat herbicide: 5,6-dihydropyrazino [1,2,3,4-Imn]- 1,10-phenanthrolinium dichloride, is reported. It was used in the solid-phase extraction procedure, following liquid chromatography-differential pulse, adsorptive-stripping voltammetric (LC-DPAdSV) technique. The operational conditions for 100% retention of the diquat herbicide on a chromatographic column (13.0 x 1.4 cm, adsorbent bed 1.0g) were realized at pH 6.9 and a flow rate of 5.0 mL min(-1). The adsorbent used could be regenerated during elution with 5.0 mL M HCl within 20 min. The limit of detection was 0.65 nM (0.18 ppb) with an enrichment factor as high as 99-fold

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