| Abstract: | Five plastic membrane Pb2+‐selective electrodes were prepared based on 1,4‐bis(N‐tosyl‐o‐aminophenoxy)butane I , 1,4‐bis(N‐allyl‐N‐tosyl‐o‐aminophenoxy)butane II , 1,4‐bis(N‐benzyl‐N‐tosyl‐o‐aminophenoxy)butane III , 1,4‐bis[N‐(o‐allyloxybenzyl)‐N‐tosyl‐o‐aminophenoxy]butane IV , and 1,4‐bis(N‐octyl‐N‐tosyl‐o‐aminophenoxy)butane V as neutral carriers. The electrodes exhibited nearly Nernstian responses over the concentration ranges, 2.5×10?4–4.0×10?2, 2.5×10?5–4.0×10?2, 7.9×10?5–4.0×10?2, 2.2×10?5–4.0×10?2, and 1.9×10?4–4.0×10?2 M for electrodes composed with the ionophores I–V , respectively. All electrodes showed pH range of about 4.0 to 11.5 and working temperature range of 22 to 70 °C with isothermal temperature coefficients of 1.19×10?3, 1.16×10?3, 1.16×10?3, 1.00×10?3 , and 1.32×10?3 V/°C for electrodes I–V respectively. |
