Naslov
Potentiometric Determination of Mercury(II) and Thiourea in Strong Acid Solution Using an Ion-selective Electrode with AgI-based Membrane Hydrophobised by PTFE

Autori
Radić, Njegomir ; Komljenović, Josipa

Izvornik
Fresenius' journal of analytical chemistry (0937-0633) 341 (1991); 592-596

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
potentiometric determination ; mercury(II) ; thiourea ; strong acid solution ;

Sažetak
The potentiometric determination of mercury(II) and thiourea (TU) in strong acid solution (pH 0 - 1) by using an "all-solid-state" ion-selective electrode with (Ag2S 25%, AgI 25% and PTFE 50% m/m)-membrane is described. The linear response, 43 mV(pHg)-1 and 80 mV(pTU)-1, has been obtained in the concentration range from 10-2 to under 10-5 mol L-1. By direct potentiometry at pH 0 mercury(II) can be determined in the presence of up to 10-3 mol L-1 of iron(III). The change in potential in the tested concentration range of thiourea indicates the formation of Ag(TU)1.4+ at the exposed surface of the membrane. This stoichiometry is in good agreement with that calculated from the average Ag/ TU ratio in the potentiometric titration. The investigated electrode can be used as a good sensor for mercury(II) and thiourea in strong acid media and a wide variety of practical analytical systems.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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