Publikace detail

Stripping voltammetric determination of iodide with synergistic accumulation at a carbon paste electrode

Autoři: Švancara Ivan | Konvalina Jiří | Schachl K | Kalcher K | Vytřas Karel

Rok: 1998

Druh publikace: článek v odborném periodiku

Název zdroje: Electroanalysis

Název nakladatele: Wiley-VCH

Místo vydání: Weinheim

Strana od-do: 435-441

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Stanovení jodidů s využitím kombinovaného mechanismu akumulace na uhlíkové pastové elektrodě metodou stripping voltametrie	Stanovení jodidů s využitím kombinovaného mechanismu akumulace na uhlíkové pastové elektrodě metodou stripping voltametrie	stanovení jodidů;uhlíkové pastové elektrody
eng	Stripping voltammetric determination of iodide with synergistic accumulation at a carbon paste electrode	Carbon paste electrodes (CPEs) of various compositions were studied to elucidate the stripping voltammetric behavior of iodide. At an accumulation potential of +0.7 V (vs. Ag/AgCl), the CPE containing tricresyl phosphate as a pasting liquid was able to preconcetrate iodide effectively via ion-pairing reaction followed by oxidation to iodine and its extraction onto pasting liquid. In a supporting electrolyte containing 0.5 M NaCl and 0.1 M HCl, the reduction signal was proportional to iodide concentration from 5 x 10(-6) to 5 x 10(-7) mol/L with a detection limit of approximately 2.5 x 10(-7) mol/L (accumulation for 5 min). Other halides and pseudohalides did not interfere with the determination, except for a high concentration excess of thiocyanate and bromide (100:1). The method was tested on model solutions and was applied to determine total iodine in samples of table salts and mineral water. The results were compared to those obtained by reference methods.	stripping voltametric determination of iodide;carbon paste electrode

Search