基于双（2-羟基苯胺）乙酰丙酮铅（II）中性载体的硝酸盐选择性膜电极。

Nitrate-selective membrane electrode based on bis(2-hydroxyanil)acetylacetone lead(II) neutral carrier.

作者信息

Asghari Alireza, Amini Mohammad K, Mansour Hassan R, Salavati-Niasari Masood, Rajabi Maryam

机构信息

College of Chemistry, Isfahan University of Technology, Isfahan, Iran.

出版信息

Anal Sci. 2003 Aug;19(8):1121-5. doi: 10.2116/analsci.19.1121.

DOI:10.2116/analsci.19.1121

PMID:12945663

Abstract

A nitrate-selective electrode based on a recently synthesized bis(2-hydroxyanil)acetylacetone lead(II) complex [(haacac)Pb] has been developed. Among different compositions studied, a membrane containing 30.7% poly(vinyl chloride) (PVC), 61.3% dibutyl phthalate (DBP) as a plasticizer, 3% methyltrioctylammonium chloride (MTOAC) as a cationic additive and 5% ionophore (all w/w) exhibited the best potentiometric response toward nitrate ion in aqueous solutions. The potentiometric response of the electrode was linear with a Nernstian slope of -58.8 mV decade(-1) within the NO3- concentration range of 2 x 10(-5)-1 x 10(-1) mol dm(-3). The response time of the electrode was < or =10 s over the entire linear concentration range of the calibration plot. The electrode is suitable for use within the pH range of 5.3-11. The selectivity coefficients for the proposed electrode were improved for some interferences, when compared with those of commercially available nitrate-selective electrodes.

摘要

基于最近合成的双（2-羟基苯胺）乙酰丙酮铅（II）配合物[（haacac）Pb]开发了一种硝酸盐选择性电极。在所研究的不同组成中，含有30.7%聚氯乙烯（PVC）、61.3%邻苯二甲酸二丁酯（DBP）作为增塑剂、3%甲基三辛基氯化铵（MTOAC）作为阳离子添加剂和5%离子载体（均为重量比）的膜对水溶液中的硝酸根离子表现出最佳的电位响应。在2×10⁻⁵ - 1×10⁻¹ mol dm⁻³的NO₃⁻浓度范围内，电极的电位响应呈线性，能斯特斜率为-58.8 mV/十倍浓度变化。在校准曲线的整个线性浓度范围内，电极的响应时间≤10 s。该电极适用于pH值为5.3 - 11的范围。与市售硝酸盐选择性电极相比，该电极对某些干扰物的选择性系数有所提高。