Novel Polymeric Membrane Sensors Based on Mn(III) Porphyrin and Co(II) Phthalocyanine Ionophores for Batch and Flow Injection Determination of Azide |
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Authors: | Saad S M Hassan Ali E Kelany Saeed S Al‐Mehrezi |
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Institution: | Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt |
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Abstract: | Two novel potentiometric azide membrane sensors based on the use of manganese(III)porphyrin Mn(III)P] and cobalt(II)phthalocyanine Co(II)Pc] ionophores dispersed in plasticized poly(vinyl chloride) PVC matrix membranes are described. Under batch mode of operation, Mn(III)P] and Co(II)Pc] based membrane sensors display near‐ and sub‐Nernstian responses of ?56.3 and ?48.5 mV decade?1 over the concentration ranges 1.0×10?2?2.2×10?5 and 1.0×10?2?5.1×10?5 mol L?1 azide and detection limits of 1.5×10?5 and 2.5×10?5 mol L?1, respectively. Incorporation of both membrane sensors in flow‐through tubular cell offers sensitive detectors for flow injection (FIA) determination of azide. The intrinsic characteristics of the Mn(III)P] and Co(II)Pc] based detectors in a low dispersion manifold show calibration slopes of ?51.2 and ?33.5 mV decade?1 for the concentration ranges of 1.0×10?5?1.0×10?2 and 1.0×10?4?1.0×10?2 mol L?1 azide and the detection limits are1.0×10?5 and 3.1×10?5 mol L?1, respectively. The detectors are used for determining azide at an input rate of 40–60 samples per hour. The responses of the sensors are stable within ±0.9 mV for at least 8 weeks and are pH independent in the range of 3.9?6.5. No interferences are caused by most common anions normally associated with azide ion. |
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Keywords: | Potentiometry Azide determination Flow injection analysis Manganese(III)porphyrin Cobalt(II)phthalocyanine PVC membrane sensors |
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