construção artesanal de um eletrodo íon seletivo a chumbo(ii): uma alternativa para disciplinas experimentais homemade construction of a lead(ii) ion selective electrode: an alternative to experimental subjects
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construção artesanal de um eletrodo íon seletivo a chumbo(ii): uma alternativa para disciplinas experimentais homemade construction of a lead(ii) ion selective electrode: an alternative to experimental subjects

;Jonatas Gomes da Silva;Arilson Lehmkuhl;Silvia Keli de Barros Alcanfor
greece and rome 2009 Vol. 32 pp. 1055-1058
140
silva2009qumicaconstruo

Abstract

This works proposes a homemade construction of a lead(II) ISE of solid membrane (Ag2S/PbS) to determine Pb2+ ions in potentiometric titrations, using damaged combined glass electrodes. This electrode can be constructed in teaching laboratories, using it as a learning tool related to the theoretical principle of ISE. The analytical curve obtained (y = 27.056x + 337.58; R = 0.996) was linear on the range of 1 x 10-5 to 1 mol L-1 and has presented a very close behavior of the Nernstian. The homemade ISE has presented a similar selectivity to the commercial electrodes, showing to be a good alternative to the experimental activities on teaching laboratories.

Keywords

lead potentiometric titrationchemistry

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DOI:
10.1590/S0100-40422009000400039
URL:
http://www.scielo.br/scielo.php?script=sci_arttext...

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ID: 198895
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