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

Abstract

homEmaDE CoNSTRUCTioN o F a lEaD(ii ) ioN SElECTiVE ElECTRoDE : aN alTERNaTiVE To ExPERimENTal SUBjECTS. 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.