Kinetic-potentiometric assay of formaldehyde in pharmaceutical and industrial samples, monitored by copper solid ion selective electrode, after its reaction with the copper(II)-bis-(ethylenediamine) complex |
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| Authors: | Dimitrios V Stergiou Spyros C Karkabounas Panayotis G Veltsistas Nicholaos P Evmiridis Athanasios G Vlessidis |
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| Institution: | (1) Laboratory of Analytical Chemistry, Department of Chemistry, University of Ioannina, 451 10 Keine Bindestriche, Ioannina, Greece;(2) Laboratory of Experimental Physiology, Faculty of Medicine, University of Ioannina, 451 10 Keine Bindestriche, Ioannina, Greece |
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| Abstract: | A kinetic-potentiometric method is described for the quantitative assay of formaldehyde (HCHO) in pharmaceutical and industrial
preparations. It is based on the reaction of HCHO with (ethylenediamine)-Cu(II)-sulfate Cu(CH2NH2)2(H2O)2] · SO4. The changes in potential, resulting from the release of the Cu(II) cations, are monitored with a Cu(II)-ion selective electrode.
The calibration curve for the HCHO is linear in the concentration range 50–250 mg L−1, with a limit of detection of 8.5 mg L−1. The method shows very good reproducibility with an RSD of 2.6% for successive injections (n = 5) of 150 mg L−1 HCHO primary solution, while it is interference free. The method was successfully tested in various industrial and pharmaceutical
preparations. |
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| Keywords: | : Formaldehyde determination kinetic determination solid ion selective electrodes |
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