基于流通式整体光极测定镉（II）的动力学方法。

Kinetic methods for the determination of cadmium(II) based on a flow-through bulk optode.

作者信息

Sanchez-Pedreño C, García M S, Ortuño J A, Albero M I, Expósito R

机构信息

Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, 30071 Murcia, Spain.

出版信息

Talanta. 2002 Mar 4;56(3):481-9. doi: 10.1016/s0039-9140(01)00571-9.

DOI:10.1016/s0039-9140(01)00571-9

PMID:18968520

Abstract

Three kinetic methods based on flow injection, flow, and stopped-flow injection were applied for the determination of Cd(II) using a flow-through bulk optode membrane that incorporates 1-(2-pyridylazo)-2-naphtol (PAN) in a plasticized poly(vinyl) chloride membrane entrapped in a cellulose support. The calibration graphs plotting the reflectance at 560 nm versus Cd(II) for the first two methods and versus [Cd(II)] for the third were linear up to 56.2 mg l(-1). The detection limits of the methods were 0.01, 0.06 and 0.8 mg l(-1), respectively. The FI method was selected for application purposes. The variation coefficient of the sensor response for 11.2 mg l(-1) of Cd(II) was +/-0.31 and +/-0.65% between different membranes. The sensor can be readily regenerated with a carrier (acetic-acetate) buffer of pH 4. The FI method was applied to the determination of cadmium in an alloy and in water.

摘要

基于流动注射、流动和停流注射的三种动力学方法被应用于使用流通式整体光极膜测定镉（II），该光极膜将1-（2-吡啶偶氮）-2-萘酚（PAN）掺入包裹在纤维素载体中的增塑聚氯乙烯膜中。前两种方法绘制在560 nm处的反射率与Cd（II）的校准曲线，第三种方法绘制反射率与[Cd（II）]的校准曲线，在高达56.2 mg l(-1)范围内呈线性。这些方法的检测限分别为0.01、0.06和0.8 mg l(-1)。为了应用目的选择了流动注射（FI）法。对于11.2 mg l(-1)的Cd（II），不同膜之间传感器响应的变异系数为±0.31%和±0.65%。该传感器可以很容易地用pH为4的载体（乙酸 - 乙酸盐）缓冲液再生。流动注射法被应用于合金和水中镉的测定。