Página 1 dos resultados de 294 itens digitais encontrados em 0.013 segundos
Resultados filtrados por Publicador: Sociedade Brasileira de Química
Recentes avanços e novas perspectivas dos eletrodos íon-seletivos
Fonte: Sociedade Brasileira de Química
Publicador: Sociedade Brasileira de Química
Tipo: Artigo de Revista Científica
Formato: text/html
Publicado em 01/10/2006
PT
Relevância na Pesquisa
608.6833%
This paper describes the recent progress in the development of polymeric membranes for ion-selective electrodes. The importance of knowing the mechanism of potential development in membranes for ion-selective electrodes to reach lower detection limits and improve selectivity are discussed. Recent advances and future trends of research on ion-selective electrodes are also reported.
Link permanente para citações:
Modern directions for potentiometric sensors
Fonte: Sociedade Brasileira de Química
Publicador: Sociedade Brasileira de Química
Tipo: Artigo de Revista Científica
Formato: text/html
Publicado em 01/01/2008
EN
Relevância na Pesquisa
597.8502%
This paper gives an overview of the newest developments of polymeric membrane ion-selective electrodes. A short essence of the underlying theory is given, emphasizing how the electromotive force may be used to assess binding constants of the ionophore, and how the selectivity and detection limit are related to the basic membrane processes. The recent developments in lowering the detection limits of ISEs are described, including recent approaches of developing all solid state ISEs, and breakthroughs in detecting ultra-small quantities of ions at low concentrations. These developments have paved the way to use potentiometric sensors as in ultra-sensitive affinity bioanalysis in conjunction with nanoparticle labels. Recent results establish that potentiometry compares favorably to electrochemical stripping analysis. Other new developments with ion-selective electrodes are also described, including the concept of backside calibration potentiometry, controlled current coulometry, pulsed chronopotentiometry, and localized flash titration with ion-selective membranes to design sensors for the direct detection of total acidity without net sample perturbation. These developments have further opened the field for exciting new possibilities and applications.
Link permanente para citações: