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New plastic membrane ion‐selective electrode for determination of trimethoprim
Author(s) -
Aboudan Mahmoud,
Issa Yousry M.,
Shoukry Adel F.
Publication year - 1994
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280610105
Subject(s) - electrode , potentiometric titration , ion selective electrode , reference electrode , analytical chemistry (journal) , distilled water , working electrode , chemistry , calibration curve , standard hydrogen electrode , membrane , ion , quinhydrone electrode , materials science , inorganic chemistry , chromatography , electrochemistry , detection limit , selectivity , biochemistry , organic chemistry , catalysis
Trimethoprimium‐phosphomolybdata, (TM) 3 PM, was used as an ion‐exchanger in the construction of a TM‐responsive plastic membrane electrode. The calibration graph slope of the electrode is 56·5 mV per TM concentration decade when preconditioned by soaking in water, over a concentration range of 2·3 × 10 −6 –10 −2 M with instantaneous response. The electrode has a life span of 24 h when soaked in 10 −3 M TM solution and 5 days when soaked in distilled water. The working pH and temperature ranges of the electrode are 1·6–6·2 and 30–65·C, respectively. The isothermal coefficient of the electrode is 0·00091 V·C −1 . The electrode is highly selective for TM towards inorganic cations, sugars and amino acids. It can be employed as a potentiometric sensor for determination of TM in pure solution and in tables.