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۱Fabrication of a Lead All Solid State Sensor for ppb Level Monitoring of Aqueous Lead Samples
نویسنده(ها): ،
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، هشتم،شماره۲، Mar ۲۰۱۶، سال
تعداد صفحات: ۱۲
A novel all–solid–state ion selective electrode (ASS–ISE) has been constructed for the determination of Pb(II) ions in complex aqueous media. The ASS–ISE is constructed of a layer of a conductive graphite–epoxy resin composite on a copper wire, further coated with a Pb(II) selective PVC membrane. The optimal PVC membrane is composed of 31% PVC, 62% nitrobenzen (NB), 2% of sodium tetraphenyl borate, and 5% of N,N՛–dimethylcyanodiaza–18crown–6 as a selectophore (L). The studies proved the device to have a Nernstian response (i.e. 29.4±0.3 mV per decade) in a concentration range from 1.0×10–8 mol L–1 to 1.0×10–3 mol L–1, with a lower detection limit of 4.0×10–9 mol L–1. The proposed ASS–ISE was also found to possess a good Pb(II)–selectivity as opposed to various interfering cations. The device was further practically tested in the analysis of lead content of some water samples with complex matrices.
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