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Chromatographia

, 55:171 | Cite as

Determination of diquat herbicide by selective enrichment by column chromatography on imprinted polymer immobilised on silica gel

  • B. B. Prasad
  • S. Banerjee
Originals Column Liquid Chromatography

Summary

A silica gel-bound, imprinted polymer for selective recognition of the diquat herbicide: 5,6-dihydropyrazino [1,2,3,4-lmn]-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 (13.0×1.4 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 MHCl within 20 min. The limit of detection was 0.65 nM (0.18 ppb) with an enrichment factor as high as 99-fold.

Key Words

Column liquid chromatography Molecularly imprinted polymers Selective enrichment Differential pulse, adsorptive-stripping voltammetry Diquat herbicide 

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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH 2002

Authors and Affiliations

  • B. B. Prasad
    • 1
  • S. Banerjee
    • 1
  1. 1.Analytical Division, Chemistry Department, Faculty of ScienceBanaras Hindu UniversityVaranasiIndia

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