Ion-selective electrodes based on metalloporphyrins for gibberellic acid determination in agricultural products

Santos, Emília M. G.; Couto, Cristina M. C. M.; Montenegro, M. Conceição B. S. M.; Neves, M. Graça P. M. S.; Rebelo, Susana L. H.; Cavaleiro, J. A. S.; Reis, Boaventura F.
February 2003
Analytical & Bioanalytical Chemistry;Feb2003, Vol. 375 Issue 4, p511
Academic Journal
This work describes the construction, evaluation and analytical application of electrodes selective to the gibberellate anion for the determination of gibberellic acid in agricultural products. Several types of PVC membrane electrodes without internal reference solution were prepared using the manganese(III) complex of meso -tetraphenylporphyrin (TPP) as ionophore and dibutyl phthalate (DBP), as plasticizer. The incorporation of lipophilic chemical species as additives, was also carried out aiming the evaluation of the response characteristics of the electrodes. To accomplish the analysis of commercial agricultural products a selective membrane composed of 28.0% (w/w) of PVC, 66.0% (w/w) of plasticizer and 6% (w/w) of ionophore was used, with no additive. This potentiometric unit presented a linear response between 10–4 and 10–1 mol L–1 in gibberellate, a slope of about -69 mV dec–1 and a reproducibility of about ±1 mV day–1. The potentiometric analysis of gibberellic acid in commercial products was carried out by direct potentiometry and the results obtained were compared with those provided by HPLC.


Related Articles

  • Ion-selective electrode for the determination of dimethylbenzylammonium ions. Kopytin, A. V.; Urusov, Yu. I.; Zhukov, A. F.; Kokunov, Yu. V. // Journal of Analytical Chemistry;Jan2011, Vol. 66 Issue 1, p73 

    sensor is proposed for the direct potentiometric determination of dimethylbenzylammonium in acid and neutral aqueous solutions. The sensor membrane is made of a polymeric composition on the basis of polyvinylchloride containing an ion associate and a solvent as a plasticizer. Salts of the...

  • Piribedil-Selective Electrodes Based on Bi(III)-Iodide and Hg(II)-Iodide Complexes. Abdel-Gawad, Fatama M.; Issa, Yousry M.; Hassouna, Mohamed E. M.; Hussien, Emad M. // Microchimica Acta;Jan2003, Vol. 141 Issue 1/2, p7 

    We describe new ion-selective electrodes for piribedil (PD) based on Bi(III)-iodide or Hg(II)-iodide piribedil ion associate complexes in a poly(vinyl chloride) (PVC) membrane with dibutylphthalate (DBP) and dioctylphthalate (DOP) as plasticizing solvent mediator. The electrodes (PD-[BiI4]/DBP,...

  • PVC MATRX IONIC - SURFACTANT SELECTIVE ELECTRODES BASED ON THE IONIC PAIR TETRA ALKYL-AMMONIUM - LAURYLSULPHATE. Mihali, Cristina; Oprea, Gabriela; Cical, Elena // Studia Universitatis Babes-Bolyai, Chemia;2009, Issue 3, p141 

    A series of all-solid-state electrodes sensible to the anionic surfactants were developed using silver pills coated with PVC membranes. We used cetyltrimethylammonium laurylsulfate (CTMA-LS) and tricaprylmethylammonium laurylsulfate (TCMA-LS) as electroactive matter (ionophore) and different...

  • Potentiometric Determination of Raloxifene by PVC Membrane Sensor. Ganjali, Mohammad Reza; Aghili, Sara; Pirali-Hamedani, Morteza; Norouzi, Parviz // International Journal of Electrochemical Science;Nov2012, Vol. 7 Issue 11, p10394 

    PVC membrane potentiometric sensor was made for determination of raloxifene, an oral selective estrogen receptor modulator, in pharmaceutical formulations. The electrode respond based on ion-exchange mechanism. The ion-pair used as a sensing element in PVC membrane composition was synthesized...

  • PVC membrane sensor based on periodate-Cetylpyridinium ion pair for the potentiometric determination of periodate. Othman, Abdelhameed M. // Journal of Analytical Chemistry;Nov2010, Vol. 65 Issue 11, p1191 

    new plasticized membrane sensor has been proposed for the determination of periodate based on periodate-cetylpyridinium ion pair complex. The electrode shows a linear, reproducible and stable potentiometric response with anionic Nernstian slope of 58.1 � 0.5 mV/decade over a wide range of...

  • Cobalt(II)-selective membrane sensor based on a [Me2(13)dieneN4] macrocyclic cobalt complex. Singh, Ashok Kumar; Saxena, Puja; Mehtab, Sameena; Panwar, Amit // Analytical & Bioanalytical Chemistry;Sep2006, Vol. 385 Issue 7, p1342 

    A new poly(vinyl chloride)-based membrane was fabricated with the cobalt(II) complex of 2,4-dimethyl-1,5,8,11-tetraazacyclotrideca-1,4-diene [Me2(13)dieneN4] as an ion carrier. The membrane composition was Co2+ complex/PVC/NaTPB/DBP 15:50:15:20 (w/w). The sensor exhibited a Nernstian response...

  • Lead-selective poly(vinyl choride) membrane electrodes based on heterocyclic thiocarboxylic acid. Zhenning Yan; Yuting Wang; Yipeng Guo // Journal of Analytical Chemistry;Dec2009, Vol. 64 Issue 12, p1252 

    Heterocyclic thiocarboxylic acids have been designed to prepare polymeric membrane ion-selective electrode (ISE) for Pb2+. Construction, response characteristic and application of the lead ISEs are investigated. Better results have been obtained with membranes containing ligands L1∼L3 with...

  • Cetrimide Potentiometric PVC membrane Sensor. Faridbod, Farnoush; Khamseh-nejad, Masoumeh; Ganjali, Mohammad Reza; Norouzi, Parviz; Hajiaghababaei, Leila // International Journal of Electrochemical Science;2012, Vol. 7 Issue 3, p1917 

    In the present work, two types of potentiometric electrodes were constructed for determination of cetrimide. The sensors demonstrated advanced performances with a fast response time, a lower detection limit of 4.0x10-6 M and potential responses across the range of 5.0x10-6-1.0x10-3 M. The ensors...

  • Application of a New Tramadol Potentiometric Membrane Sensor as a Useful Device for Tramadol Hydrochloride Analysis in Pharmaceutical Formulation and Urine. Ganjali, Mohammad R.; Razavi, Taherehsadat; Faridbod, Farnoush; Riahi, Siavash; Norouzi, Parviz // Current Pharmaceutical Analysis;Feb2009, Vol. 5 Issue 1, p28 

    Tramadol, a 4-phenyl-piperidine analogue of codeine, is usually marketed as the hydrochloride salt and is a centrally acting analgesic, used for treating moderate to severe pain. In this study, a potentiometric liquid membrane sensors for simple and fast determination of tramadol hydrochloride...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics