Department of Basic Sciences, Sari Agricultural sciences and Natural resources University, 9 km Khazar Boolvard, Sari, Mazandaran, P.O. Box 578, Iran.
J Hazard Mater. 2009 Dec 15;172(1):68-73. doi: 10.1016/j.jhazmat.2009.06.145. Epub 2009 Jul 4.
A series of recently synthesized benzo- and pyridine-substituted macrocyclic diamides were studied to characterize their abilities as lead ion carriers in PVC membrane electrodes. The electrode based on 3,15,21-triaza-4,5;13,14-dibenzo-6,9,12-trioxabicycloheneicosa-1,17,19-triene-2,16-dione exhibits a Nernstian response for Pb2+ ions over a wide concentration range (1.3 x 10(-2) to 3.6 x 10(-6) mol L(-1)) with a limit of detection of 2.0 x 10(-6) mol L(-1) (0.4 ppm). The response time of the sensor is approximately 16 s, and the membrane can be used for more than two months without observing any deviation. The electrode revealed comparatively good selectivities with respect to many cations including alkali earth, transition and heavy metal ions. The proposed sensor could be used in pH range of 3.7-6.5. It was used as an indicator electrode in potentiometric titration of chromate ions with a lead ion solution.
一系列最近合成的苯并和吡啶取代的大环二酰胺被研究以表征它们作为 PVC 膜电极中铅离子载体的能力。基于 3,15,21-三氮杂-4,5;13,14-二苯并-6,9,12-三氧杂环十五烷-1,17,19-三烯-2,16-二酮的电极对 Pb2+离子表现出宽浓度范围（1.3 x 10(-2) 至 3.6 x 10(-6) mol L(-1)）的 Nernst 响应，检测限为 2.0 x 10(-6) mol L(-1)（0.4 ppm）。传感器的响应时间约为 16 秒，并且在不观察任何偏差的情况下，该膜可以使用超过两个月。该电极对包括碱土金属、过渡金属和重金属离子在内的许多阳离子表现出相对较好的选择性。所提出的传感器可用于 pH 值为 3.7-6.5 的范围。它被用作以铅离子溶液进行铬酸盐离子的电位滴定中的指示电极。
