SciELO - Scientific Electronic Library Online

 
vol.26 número6Efeito do polietilenoglicol e da albumina na imobilização de lipase microbiana e na catálise em meio orgânicoDeterminação voltamétrica de 4-clorofenol sobre o eletrodo de diamante dopado com boro utilizando a voltametria de onda quadrada índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Química Nova

versão impressa ISSN 0100-4042

Resumo

RICHTER, Eduardo M. et al. Electroanalytical applications of silver electrodes built from recordable CDs. Quím. Nova [online]. 2003, vol.26, n.6, pp. 839-843. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422003000600011.

This paper presents a new way for the construction of silver electrodes utilizing recordable CDs. The new electrodes were explored for the quantification of chloride (by potentiometry/FIA), cyanide (by amperometry/FIA) and for lead analysis (by square wave voltammetry). For the flowing measurements, a digital multimeter, connected to a microcomputer (via RS 232 interface) was used to collect directly the potential signal (for Cl- measurements) or to take the output signal from a potentiostat (for CN- measurements). The square wave voltammetry analysis was performed in a commercial instrument. The results shown good performance of the new electrodes and the detection limit (s/n = 3) attained for these three analytes were: 0.2, 50, and 200 µg L-1 for Pb2+, Cl-, and CN- respectively.

Palavras-chave : silver CD-R electrodes; interfaced multimeter; electroanalysis.

        · texto em Português     · pdf em Português