| Autor: |
da Silva GM; Laboratório Interdisciplinar de Eletroquímica e Cerâmica, Departamento de Química, Universidade Federal de São Carlos, C.P.: 676, 13560-970, São Carlos, SP, Brazil., Lemos SG, Pocrifka LA, Marreto PD, Rosario AV, Pereira EC |
| Jazyk: |
angličtina |
| Zdroj: |
Analytica chimica acta [Anal Chim Acta] 2008 May 26; Vol. 616 (1), pp. 36-41. Date of Electronic Publication: 2008 Mar 20. |
| DOI: |
10.1016/j.aca.2008.03.019 |
| Abstrakt: |
In this work, the polymeric precursor method was used to prepare low-cost solid-state sensors for pH determination based on iridium oxide as the main pH sensitive material. The iridium content was reduced with addition of TiO(2), forming the binary system IrO(x)-TiO(2), whose electroanalytical properties were evaluated in comparison with a commercial glass pH electrode. The minimum iridium content which gave suitable results was 30mol%, and the electrode presented Nernstian and fast response in the pH range from 1 to 13, with no hysteresis effect observed. Besides, the electrode showed high selectivity in the presence of alkali ions as Li(+), Na(+) or K(+). The amount of iridium in the prepared electrodes was very small (<0.1mg), supporting the efficiency of this method on the simple preparation of functional low-cost pH electrodes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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