Analytical Sciences

Nitrate-Selective Membrane ElectrodeBased on Bis(2-hydroxyanil)acetylacetone Lead(II) NeutralCarrier

Alireza ASGHARI,* Mohammad K.AMINI,**  Hassan R. MANSOUR,* MasoodSALAVATI-NIASARI,*** and Maryam RAJABI*

*College of Chemistry, Isfahan Universityof Technology, Isfahan, Iran
**Department of Chemistry, University ofIsfahan, Isfahan, 81746-73441, Iran
***Department of Chemistry,University of Kashan, Kashan, Iran

A nitrate-selective electrode based on arecently synthesized bis(2-hydroxyanil)acetylacetone lead(II) complex[(haacac)Pb] has been developed. Among different compositions studied, amembrane containing 30.7% poly(vinyl chloride) (PVC), 61.3% dibutylphthalate (DBP) as a plasticizer, 3% methyltrioctylammonium chloride(MTOAC) as a cationic additive and 5% ionophore (all w/w) exhibited thebest potentiometric response toward nitrate ion in aqueous solutions. Thepotentiometric response of the electrode was linear with a Nernstian slopeof -58.8 mV decade^-1 within the NO₃^-concentration range of 2 x 10^-5 - 1 x 10.1 mol dm^-3.The response time of the electrode was ≤ 10 s over the entire linearconcentration range of the calibration plot. The electrode is suitable foruse within the pH range of 5.3 - 11. The selectivity coefficients for theproposed electrode were improved for some interferences, when compared withthose of commercially available nitrate-selective electrodes.

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