Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561469 | Talanta | 2005 | 8 Pages |
Abstract
Two novel membrane sensors sensitive and reasonably selective for Cu2+ ions are described. These are based on the use of newly synthesized cyclic tetrapeptide derivatives as neutral ionophores and sodium tetraphenylborate (NaTPB) as an anionic excluder in plasticized PVC membranes. The sensors exhibit fast and stable near-Nernstian response over the concentration range 1.0 Ã 10â6 mol lâ1 to 1.0 Ã 10â2 mol lâ1 Cu2+ with a cationic slope of 30.2-25.9 mV per decade at pH 4.5-7 with a lower detection limit of 0.05-0.13 μg mlâ1. Effects of plasticizers, lipophilic salts and various foreign common ions are tested. The sensors display long life-span, long term stability, high reproducibility, and short response time. Selectivity of both sensors is significantly high for Cu2+ over Fe3+, Al3+, Zn2+, Cd2+, Hg2+, Ni2+, Co2+, Mn2+, alkaline earth and alkali metal ions. The sensors are used for direct measurement of copper content in different rocks and industrial wastewater samples from electroplating factories. The results agree fairly well with data obtained using atomic absorption spectrometry.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Saad S.M. Hassan, Eman M. Elnemma, Ayman H.K. Mohamed,