US EPA

615910 

Journal Article 

Stripping analysis of mercury(II) ionic solutions under magneto-hydrodynamic convection 

Panta, YM; Qian, S; Cheney, MA 

2008 

Yes 

Journal of Colloid and Interface Science
ISSN: 0021-9797
EISSN: 1095-7103 

317 

1 

175-182 

English 

17919650 

10.1016/j.jcis.2007.08.049 

WOS:000251283100021 

Abstract: Inorganic mercury(II) ions are ubiquitous contaminants of world water systems and thus their determination and removal from the environment are important. The effects of magnetic field on the stripping analysis of mercury(II) ionic solutions have been experimentally investigated. During the stripping analysis, a potential difference is applied across the working and reference electrodes positioned in the working sample and a current density transmits through the electrolyte solution. When the electrochemical cell is exposed to a magnetic field, provided by a permanent magnet, the interaction between the current density and the magnetic field induces Lorentz forces, which, in turn, induce fluid motion. The induced magneto-hydrodynamic (MHD) convection enhances the ionic mass transport during the deposition and stripping steps, which leads to larger anodic current during the stripping step, thus obtaining higher detection sensitivity during the determination of the mercury(II) ions. The Hg²⁺ ionic solutions with concentrations ranging from 1 nM to 1 μM in the presence and absence of supporting electrolyte, 30 mM nitric acid (HNO3) and 0.1 M potassium nitrate (KNO3), under various magnetic flux densities (, and 0.71 T) were measured with a linear sweep stripping voltammetry (LSSV) technique. The experimental results demonstrated that the stripping signals of the Hg²⁺ ions are enhanced, respectively, more than 10 and 30% in the absence and presence of the supporting electrolyte under a magnetic flux density as compared to the cases in the absence of the magnetic field with all other identical conditions. [Copyright 2008 Elsevier] Copyright of Journal of Colloid & Interface Science is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 

ELECTROCHEMICAL analysis; MATTER -- Properties; MAGNETIC induction; FLUID dynamics