Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, Maharashtra 400085, India.
J Hazard Mater. 2010 Mar 15;175(1-3):1031-6. doi: 10.1016/j.jhazmat.2009.10.113. Epub 2009 Nov 5.
A polyvinylchloride (PVC) based liquid membrane ion selective electrode (ISE) for cesium was fabricated with 5-(4'-nitrophenylazo)25,27-bis(2-propyloxy)26,28-dihydroxycalix[4]arene as ionophore. Different membrane constituents were investigated to realise optimum performance of the ISE developed. Of the four plasticizers and two ion additives studied, the best response was observed with membrane having 2-nitro phenyl octyl ether (oNPOE) as plasticizer and potassium tetrakis (perchloro phenyl) borate (KTpClPB) as ion additive. Linear response over concentration range of 10(-5)-10(-1)M CsCl was obtained. The Nernstian slope of the response was 56 mV per decade for Cs with a response time less than 20s. Matched potential method has been applied to find out the selectivity for Cs over several ions like Rb(+), K(+), Na(+), NH(4)(+), Sr(2+), Ba(2+), Ca(2+), Mg(2+), Cu(2+), Pb(2+), Zn(2+), Ni(2+) and Ce(3+). The response of ISE for Cs(+) was fairly constant over the pH range of 3-11. The lifetime of the electrode is 9 months which is the longest life for any membrane-based Cs-ISE so far developed. The concentration of cesium in two simulated high level active waste streams was determined and results agreed well with those obtained independently employing atomic absorption spectrometry.
一种基于聚氯乙烯（PVC）的液体膜离子选择性电极（ISE）被制备出来，用于铯的检测，其离子载体为 5-（4′-硝基苯偶氮）-25,27-双（2-丙氧基）-26,28-二羟基杯[4]芳烃。研究了不同的膜组成部分，以实现所开发的 ISE 的最佳性能。在所研究的四种增塑剂和两种离子添加剂中，使用 2-硝基苯辛基醚（oNPOE）作为增塑剂和四（全氯苯基）硼酸钾（KTpClPB）作为离子添加剂的膜具有最佳的响应。在 10(-5)-10(-1)M CsCl 的浓度范围内获得了线性响应。Cs 的 Nernst 斜率为每十年 56 mV，响应时间小于 20s。采用匹配电位法研究了 Cs 对 Rb(+)、K(+)、Na(+)、NH(4)(+)、Sr(2+)、Ba(2+)、Ca(2+)、Mg(2+)、Cu(2+)、Pb(2+)、Zn(2+)、Ni(2+)和 Ce(3+)等多种离子的选择性。ISE 对 Cs(+)的响应在 pH 值为 3-11 的范围内相当稳定。电极的寿命为 9 个月，这是迄今为止开发的任何基于膜的 Cs-ISE 中最长的寿命。两种模拟高放废液中铯的浓度被测定，结果与独立采用原子吸收光谱法得到的结果吻合良好。
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