Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10562964 | Talanta | 2005 | 4 Pages |
Abstract
In this paper, a new high sensitivity potentiometric pH-electrode with a response in the acid region is proposed. It consists of a PbO2-paraffin matrix deposited on graphite. Its simple construction and studies of some variables at 0.5 mol Lâ1 ionic strength are reported. A direct relationship between the electric potential difference and the solution pH was observed for pH values ranging from 1.2 to 7.5. A slope greater than 100 mV/decade and a conditional electric potential of about 1250 mV were obtained. The results presented a high correlation with those from a conventional glass pH-electrode in complex matrix samples.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Alexandre Correa Lima, Adriana Aparecida Jesus, Mário Alberto Tenan, Astréa F. de Souza Silva, André Fernando Oliveira,