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KMID : 1059519950390030186
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Journal of the Korean Chemical Society
1995 Volume.39 No. 3 p.186 ~ p.190
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Determination of Iron in Seawater by Adsorptive Stripping Voltammetry
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Case Myung-Zoon
Kim Kyung
Kwon Young-Soon
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Abstract
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A simple procedure, readily available at low cost with a sensitivity sufficient to determine trace levels of iron in seawater is proposed, which utilizes adsorptive accumulation of the iron/catechol complex on the mercury drop electrode in a borate medium of pH 8.0. Optimal conditions include a solution concentration of 2 mM catechol, 2.5 mM borate and a pH of 8.0, an accumulation potential of - 0.25 V is applied for 1∼3 min, and the potential scan is in the differential pulse mode. The limit of detection is 1.5 nM Fe using a preconcentration time of 3 min. The interference from copper can be eliminated and baseline slope is greatly improved, because its peak is well separated from that of iron in the proposed medium.
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