Construção artesanal de um eletrodo íon seletivo a chumbo(II): uma alternativa para disciplinas experimentais

• Autor(a) principal: Silva,Jonatas Gomes da
• Data de Publicação: 2009
• Outros Autores: Lehmkuhl,Arilson, Alcanfor,Silvia Keli de Barros
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000400039
• topic: ion selective electrode; lead; potentiometric titration

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.