基于丁二酮双（水杨酰腙）锌（II）配合物的高选择性硫氰酸根离子膜电极。

Highly selective thiocyanate membrane electrode based on butane-2,3-dione bis(salicylhydrazonato)zinc(II) complex.

作者信息

Ardakani M Mazloum, Sadeghi A, Salavati-Niasari M

机构信息

Department of Chemistry, Faculty of Science, Kashan University, Kashan, Iran.

出版信息

Talanta. 2005 May 15;66(4):837-43. doi: 10.1016/j.talanta.2004.12.039. Epub 2005 Jan 26.

DOI:10.1016/j.talanta.2004.12.039

PMID:18970061

Abstract

A highly selective poly(vinyl chloride) (PVC) membrane electrode based on butane -2,3-dione bis(salicylhydrazonato) zinc(II) [Zn (BDSH)] complex as carrier for thiocyanate-selective electrode is reported. The influence of membrane composition, pH and possible interfering anions were investigated on the response properties of the electrode. The sensor responds to thiocyanate in linear range from 1.0x10(-6) to 1.0x10(-1)M with a slope -56.5+/-1.1mVdecade(-1), over a wide pH range of 3.5-8.5. The limit of detection of the electrode was 7.0x10(-7)M SCN(-). Selectivity coefficients determined with fixed interference method (FIM) indicate a good discriminating ability towards SCN(-) ion in comparison to other anions. The proposed sensor has a fast response time of about 5-15s and can be used for at least 3 months without any considerable divergence in potential. It was applied as indicator electrode in titration of thiocyanate with Ag(+) and in potentiometric determination of thiocyanate in saliva and urine samples.

摘要

报道了一种基于丁二酮双（水杨酰腙）锌（II）[Zn（BDSH）]配合物作为载体的高选择性聚氯乙烯（PVC）膜硫氰酸根离子选择性电极。研究了膜组成、pH值和可能的干扰阴离子对电极响应性能的影响。该传感器对硫氰酸根离子的响应线性范围为1.0×10⁻⁶至1.0×10⁻¹M，斜率为-56.5±1.1mV/decade⁻¹，在3.5 - 8.5的宽pH范围内。电极的检测限为7.0×10⁻⁷M SCN⁻。用固定干扰法（FIM）测定的选择性系数表明，与其他阴离子相比，该电极对SCN⁻离子具有良好的区分能力。所提出的传感器响应时间约为5 - 15秒，可使用至少3个月而电位无明显偏差。它被用作硫氰酸根离子与Ag⁺滴定的指示电极以及唾液和尿液样品中硫氰酸根离子的电位测定。