Liquid-state mercury(II) ion-selective electrode based on N-(O,O-diisopropylthiophosphoryl)thiobenzamide |
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Authors: | Walenty Szczepaniak Jolanta Oleksy |
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Institution: | Faculty of Chemistry, A. Mickiewicz University, ul. Grunwaldzka 6, 60-780 Poznań Poland |
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Abstract: | A liquid ion-exchange electrode containing a complex of mercury(II) with N-(O,O-diisopropylthiophosphoryl)thiobenzamide in carbon tetrachloride is described. The electrode shows excellent sensitivity and good selectivity. The slope of the calibration graph is 29.0 mV/pHg2+ in the pHg2+ in the pHg2+ range 2–15.2 in mercury(II) ion buffers. The electrode can be used for determination of 5 × 10?5–10?2 M Hg(II) in the presence of 10?2 M Cu(II), Ni(II), Co(II), Zn(II), Pb(II), Cd(II), Mn(II), Fe(III), Cr(III), Bi(III) or Al(III) ions and in the presence of 10?3 M Ag(I) ions. It can bealso used for end-point detection in titrations with EDTA of 10?3–10?4 M mercury(II) at pH 2. |
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