Sensing method based on impedance variation of minicolumn packed with cation-exchanger under electric field

Tsuji, Tadasuke; Kitagawa, Shinya; Ohtani, Hajime
June 2009
Analytical & Bioanalytical Chemistry;Jun2009, Vol. 394 Issue 3, p835
Academic Journal
Voltage-induced impedance variation of the minicolumn (i.d. 0.53 mm, length 2 mm) packed with cation exchanger was investigated to develop a sensing method. An aqueous sample solution containing the metal cations was continuously supplied to the minicolumn during the impedance measurement with the simultaneous application of both alternating current voltage (amplitude, 1.0 V; frequency, 200 kHz to 6 Hz) and direct current (DC) offset voltage (0.1 to 1.0 V). On a complex plane plot, the profile of the column impedance consisted of a semicircle (200 kHz to 100 Hz) and a straight line (<100 Hz), of which slope varied with the magnitude of the applied DC offset voltage ( VDC). The slope– VDC relation depended on the kind of the metal cation and its concentration; in particular, the slope– VDC relations of monovalent cations (Na+ and K+) and divalent ones (Mg2+ and Ca2+) were significantly different. With the change in the concentration of minor divalent salt of MgCl2 or CaCl2 (60 to 140 μM) in the sample solution containing 10 mM NaCl, the slopes showed almost linear relationships between those with application of VDC = 0.1 V and 1.0 V both for magnesium and calcium additions. In the case of plural addition of both MgCl2 and CaCl2 to the solution, the data points in the slope0.1V–slope1.0V plot were located between the two proportional lines for single additions of magnesium and calcium, reflecting both the mixing ratio and net concentrations of the divalent cations. Thus, simulations determination of Mg2+ and Ca2+ can be attained on the basis of the slope0.1V–slope1.0V relation obtained by the impedance measurements of the minicolumn. Actually, the contents of both magnesium and calcium cations in the bottled mineral waters determined simultaneously using the proposed method were almost equivalent to those obtained by the atomic absorption spectrometric measurement.


Related Articles

  • Field-assisted diffusion of K, Rb, Cs, Ag, and Tl ions in sodium silicate glass. Sviridov, S.; Tyurnina, Z.; Tyurnina, N. // Glass Physics & Chemistry;Apr2012, Vol. 38 Issue 2, p206 

    The composition of the diffusion zone formed during the interaction between 20NaO · 80SiO glass and molten silver, rubidium, cesium, and thallium nitrates with and without imposition of a constant electric field was determined using X-ray microanalysis. The interdiffusion coefficients and...

  • A new process for desalination and electrodeionization of water by means of electrostatic shielding zones - ionic current sinks. Dermentzis, K.; Papadopoulou, D.; Christoforidis, A.; Dermentzi, A. // Journal of Engineering Science & Technology Review;2009, Vol. 2 Issue 1, p33 

    We constructed electrostatic shielding zones made of electrode graphite powder and used them as a new type of ionic and electronic current sinks. Because of the local elimination of the applied electric field, voltage and current within the current sinks, ions are led inside them and accumulate...

  • Anomalous impedance and anomalous ion heating due to gyrorelaxation through magnetohydrodynamic fluctuations. Yoshida, Zensho // Physics of Fluids B: Plasma Physics;Jun92, Vol. 4 Issue 6, p1534 

    The ion viscosity associated with the gyrorelaxation dominates the dissipation of fluctuations in a fast reconnection process, where the magnetic compression becomes finite. The kink instability, which drives the fast reconnection, yields a spontaneous ν×B electric field that diminshes...

  • Desalination of Saline Sludges Using Ion-Exchange Column with Zeolite. Ghaly, A. E.; Verma, M. // American Journal of Environmental Sciences;2008, Vol. 4 Issue 4, p388 

    A flushing process followed by a zeolite based ion-exchange process were developed for the treatment of saline sludges from oil and gas exploration sites. The particle size distribution of sludge sample indicated the presence of very fine sand and clay. The electrical conductivity of the sludge...

  • Application of capacitive deionization technology to the removal of sodium chloride from aqueous solutions. Hou, C.; Huang, C.; Hu, C. // International Journal of Environmental Science & Technology (IJE;Jul2013, Vol. 10 Issue 4, p753 

    Capacitive deionization has been developed as a promising desalination alternative for removing ions from aqueous solutions. In this study, the evaluation of capacitive performance was carried out by galvanostatic charge/discharge and cyclic voltammetry experiments. The good capacitive and...

  • A STATISTICAL APPROACH TO THE MINERAL WATERS OF TRANSYLVANIAN BASIN-EASTERN CARPATHIANS BOUNDARY. KIS, Boglárka-Mercedesz; BACIU, Călin; KÉKEDY-NAGY, Ladislau // Studia Universitatis Babes-Bolyai, Ambientum;Dec2013, Vol. 58 Issue 1/2, p55 

    In Romania important resources of sparkling mineral waters are related to the Neogene magmatic activity in the Eastern Carpathians. These mineral water springs are located on the eastern and western slopes of the Neogene to Quaternary volcanic chain. Based on a survey carried out in the...

  • Effect of Diffusion Nonlinearity and an External Electric Field on the Formation of Ion-Exchange Diffraction Gratings in Glass. Zhurikhina, V. V. // Optics & Spectroscopy;Jul2001, Vol. 91 Issue 1, p133 

    The formation of gratings in glass by the ion exchange technique is analyzed. The ion exchange is modeled, and the effect of diffusion nonlinearity and the external electric field on the diffusant concentration profile and diffraction characteristics of gratings are studied. It is shown that the...

  • Influence of ionic strength on sodium-calcium exchange of two temperate climate soils. Evangelou, V. P.; Marsi, M. // Plant & Soil;Mar2003, Vol. 250 Issue 2, p307 

    Salt-affected soils have been studied extensively with respect to their Na–Ca exchange properties. These studies have focused on soil environments of the arid West. However, because of irrigation and oil well brine discharges in the temperate region of the U.S. there is need to understand...

  • Partial demineralisation of drinking water using carbon dioxide regenerated ion exchangers . Höll, W.H.; Hagen, K. // Water Science & Technology: Water Supply;2002, Vol. 2 Issue 1, p57 

    Focuses on CARIX which is an ion exchange process which usually applies a mixed bed consisting of a weakly acidic and a strongly basic exchanger material. How carbon dioxide is applied as the only chemical for regeneration of the exchangers; Conseqeunce of this application.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics