基于酞菁铜衍生物为载体的电极对水杨酸根的选择性电位响应

本文以2,9,16,23-四硝基酞菁铜(II) (Cu(II)TNPc) 和2,9,16,23-四氨基酞菁铜(II) (Cu(II)TAPc) 为载体制备PVC聚合膜，构建了水杨酸根选择性电极，并探讨了该电极的选择性响应性能。研究了增塑剂的性质、载体的含量及阴、阳离子添加剂对电极电位响应的影响。结果表明，基于Cu(II)TNPc为载体的PVC膜电极对水杨酸根 (Sal－) 呈现出优先选择性电位响应。具有最佳电位响应的电极的膜组成是：(w/w) 3.0% Cu(II)TNPc，67.0% o-NPOE，29.5% PVC和0.5% NaTPB。基于该组成的电极的线性响应范围为1.0×10－1－9.0×10－7 mol·L－1，检测下限为7.2×10－7 mol·L-1，斜率为－59.8±0.5 mV/decade；其响应快速，稳定性好，适宜的pH范围是3.0－7.0。并成功运用于了实际样品中水杨酸含量的测定，获得令人满意的结果。

Salicylate‐selective Potential Response of an Electrode Based on a Copper(II)‐phthalocyanine Derivative as an Ionophore

Selectivity properties were established for salicylate‐selective electrodes prepared by incorporating 2,9,16,23‐copper(II)‐tetranitrophthalocyanine (Cu(II)TNPc) and 2,9,16,23‐copper(II)‐tetraaminophthalocyanine (Cu(II)TAPc) into plasticized poly(vinyl chloride) (PVC) membranes. The effect of nature of plasticizer, concentrations of ionophore and anionic and cationic additives on the potential response of the electrode was investigated. The PVC membrane electrode based on Cu(II)TNPc exhibited preferential selectivity for salicylate (Sal^?) over other tested anions. The best potential response characteristics of a wide working concentration range 1.0×10^?1 – 9.0×10^?7 mol·L^?1 and a limit of detection of 7.2×10^?7 mol·L^?1 with a slope of ( ? 59.8±0.5) mV/decade were observed for the membrane containing (w/w) 3.0% Cu(II)TNPc, 67.0% o‐NPOE, 29.5% PVC, and 0.5% NaTPB. The proposed electrode with good stability and fast response could be used over a pH range of 3.0 – 7.0. And it was successfully applied to the determination of salicylate in actual samples with satisfactory results.