Improving the detection limit of anion-selective electrodes: an iodide-selective membrane with a nanomolar detection limit |
| |
Authors: | Malon Adam Radu Aleksandar Qin Wei Qin Yu Ceresa Alan Maj-Zurawska Magdalena Bakker Eric Pretsch Emö |
| |
Affiliation: | Laboratorium für Organische Chemie, ETH H?nggerberg, CH-8093 Zürich, Switzerland. |
| |
Abstract: | The lower detection limit and the selectivity behavior of anion-selective electrodes (ISEs) are improved by using optimized inner solutions and membrane compositions. With a membrane based on the recently described ionophore [9]mercuracarborand-3, a detection limit of 2 x 10(-9) M has been achieved for iodide. Nevertheless, the improvements are less pronounced than in the case of cation ISEs. This is mainly due to the fact that so far no anion ISE is known with the extremely high selectivities of cation ISEs. If the membrane does not contain an ionophore, leaching of the ion exchanger from the membrane into the sample is also a relevant limiting factor except for ion exchangers of very high lipophilicity. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|