Evaluation of a high sensitivity PbO(2) pH-sensor |
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Authors: | Lima Alexandre Correa Jesus Adriana Aparecida Tenan Mário Alberto Silva Astréa F de Souza Oliveira André Fernando |
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Affiliation: | Laboratório de Pesquisa em Química Analítica e Físico-Química/Núcleo de Ciências Ambientais, Universidade de Mogi das Cruzes, Av. Cândido X. de Almeida Souza, 200, CEP 08780-911 Mogi das Cruzes, SP, Brazil |
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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 L−1 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. |
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Keywords: | pH-sensor PbO2-paraffin membrane High sensitivity pH-electrode |
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