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Abstract: A new ionic imprinted polymer (IIP) for Ni(II) recognition/pre-concentration was prepared via precipitation polymerization using 2-(diethylamino) ethyl methacrylate (DEM) and divinylbenzene (DVB) as a crosslinking agent in the presence of nickel(II) and 5-vynil-8-hydroxyquinoline (5-VHQ) as a bi-functionalized ligand. An important increase on the selectivity of the synthesised IIP for nickel(II) ions was obtained when comparing to the use of 8-hydroxyquinoline (8-HQ) as a ligand. The synthesised IIP was used as a new support for solid phase extraction (SPE) of nickel(II) from seawater before inductively coupled plasma optical emission spectrometry (ICP-OES) detection. Variables affecting the SPE process, such as pH, load and elution flow rates, and concentration and volume of the eluting solution, were fully evaluated. The optimised procedure consists of a sample loading (100ámL of seawater at a pH of 9.0á¦á0.1) through IIP-SPE cartridges containing 300ámg of the synthesised IIP at a flow rate of 3.0ámLámin-á1. Elution was performed by passing 2.5ámL of 2.0áM nitric acid at a flow rate of 1.5ámLámin-á1, which gave a pre-concentration factor of 40. The limit of detection (LOD) of the method was 0.26áÁgáL-á1, while the relative standard deviation (RSD) for eleven replicated measurements was 3%. Accuracy of the method was assessed by analyzing SLEW-3 (estuarine water) and TM-23.3 (lake water) certified reference materials. In addition to the selectivity of the synthesised material for nickel(II) ions against other transition metal ions and major alkaline and alkaline-earth metals (Na+, K+, Mg2+ and Ca2+) in seawater, it can be stated that the salt matrix is efficiently removed by using the proposed IIP-SPE procedure
Template and target information: nickel ion, Ni(II)
Author keywords: ionic imprinted polymer, 5-vinyl-8-hydroxyquinoline, nickel, seawater, solid phase extraction