On the use of the mercury electrode in chelatometric potentiometric titrations

Hannema, U.; Rossum, G.J. Van; Boef, G. den

doi:10.1007/bf00470982

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…acetic acid Ca-Amalgam Ca-Amalgam ) Na-AmalgamJ Cd-Amalgam) Pb-Amalgam ) Pb-Amalgam Na-Amalgam Na-Amalgam Zn-Amalgam Bi-Pb-Amalgam Cd-In-Amalgam) Cd-Tl-Amalgam j Pb-Tl-Amalgam Sb Cd Cu Cu Pb Hg 8 Ag V Zn Determine standard potentials at several temperatures (658) Used to determine activity coefficients and transference numbers of NaCl and (657) CaCl2 solutions Atmospheric 02 affects potential when concentration of Cd or Pb in amalgam is low (596,597) Used in potentiometric titration of Pb(N08)2 and Pb(OAc)2. Interferences and (15,16) equivalents are discussed Used to measure activity coefficients of NaCl in NaCl-NaC104-H20 mixtures (221) Determine standard potentials at several temperatures (659) Behavior in alkali; comparison with theory; reports standard potential (89) Potential measured at various temperatures and Bi-Pb ratios (1031) Determined potentials of various amalgam compositions and compared to theory (222) Determined the effect of T1 on potential of Pb-Amalgam electrode (595) Used to determine dissociation constant of [SbO(tartrate)] ~complex (899) Fabrication of thin film Cd electrodes; determination of standard potential (654) Potential in acidic media determined by both [Cu2+] and [Cu+] (90) Used in thermodynamic studies of CuS0v-H2S0t-H20 system (467) Fabrication of tmn film Pb electrodes by vapor deposition on glass (965) Fabrication and use in determination of halides and thiocyanates in blood (1030) Fabrication and use in potentiometric titrations _ (357) Determination of formal potential in perchloric acid at several temperatures (418) Use in potentiometric determination of thiourea (79) Determination of behavior in aqueous solution (444) Determination of potential in pyrophosphate solutions Bi-BiOOH'l Preparation of electrode and use in potentiometric titration with EDTA (689) Bi-Bi208 J…”

Section: Potentiometric and Titration Apparatusmentioning

confidence: 99%

Ion selective electrodes, potentiometry, and potentiometric titrations

Buck¹

1972

Anal. Chem.

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Section: Potentiometric and Titration Apparatusmentioning

confidence: 99%

Ion selective electrodes, potentiometry, and potentiometric titrations

Buck¹

1972

Anal. Chem.

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“…As confirmed [8] indication with a platinum electrode in the presence of a proper redox system leads to an accurate result. However, under certain conditions, formation of mercury(I) precipitates or complexes may result in incorrect end points [9]. A disadvantage of using a silver electrode in the EDTA titration is that the chloride ion should be removed from the titrant solution [10].…”

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Selective Electrochemical Analysis of Various Metal Ions at an EDTA Bonded Conducting Polymer Modified Electrode

et al. 2004

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An EDTA-bonded conducting polymer modified electrode was prepared and characterized by FT-IR. The modified electrode was used for the selective electrochemical analysis of various trace metal ions such as, Cu(II), Hg(II), Pb(II), Co(II), Ni(II), Fe(II), Cd(II), and Zn(II) at the different pHs by linear sweep and square wave voltammetry. Dynamic ranges were obtained using square wave voltammetry from 0.1 mM to 10.0 mM for Co(II), Ni(II), Cd(II), Fe(II), and Zn(II) and 0.5 nM to 20 nM for Cu(II), Hg(II), and Pb(II) after 10 min of preconcentration. The detection limits were determined to be 0. , and ion-selective electrodes (ISE) [6,7] have also been used as an indicator electrode to detect the end point in the EDTA titration. As confirmed [8] indication with a platinum electrode in the presence of a proper redox system leads to an accurate result. However, under certain conditions, formation of mercury(I) precipitates or complexes may result in incorrect end points [9]. A disadvantage of using a silver electrode in the EDTA titration is that the chloride ion should be removed from the titrant solution [10]. ISE×s have also a few disadvantages in the potentiometric titrations with EDTA. Many potentiometric ISE×s suffer from limited lifetimes as their sensing membranes may lose their ability to respond after repeated exposures to corrosive or fouling solutions. Thus, a simple analytical method for the trace analyses of various metal ions with a single electrode is necessary as a potentially alternative method to the potentiometric EDTA titration, because the potentiometric titration is not suitable for trace analysis.Stripping voltammetry is one of the most sensitive electrochemical methods for the determination of trace metals. The method is based on the preconcentration/ stripping of an analyte in the sample solution [11,12]. The stripping methods using chemically modified electrode (CME) has higher selectivity due to the ability of the modifier to capture the specific metal ion via chemical reactions [13 ± 18]. Applications of conductive polymer modified electrodes (CPMEs) to the detection of metal ions using stripping voltammetry have received considerable attention in the past and became popular [19 ± 22].The incorporation of a complexing ligand to the conducting polymer as a modifier has also been used to accumulate metal ions chemically. For example, 2,6-pyridinedicarboxylic acid (PDCA) and ethylenediaminetetraacitic acid (EDTA) simply doped in the polypyrrole film were employed for the determination of silver ions [23]. In this case, the formation of the polypyrrole/EDTA film was not reproducible due to simple doping of EDTA in the polypyrrole film.Most of the CPMEs, so far reported are restricted to use in the one or two metal ion detections. Thus, the fabrication of a new CPME, which can detect various metal ions is necessary. A single EDTA-CPME can be advantageously employed for the detection of many metal ions at different pHs.In the present work, we report the EDTA-bonded conducting polymer modi...

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