水和蔬菜中硝酸盐的单界面流动电位检测系统。

PubMed ID
发表日期 2010年Jan月

原始出处 塔兰塔
Talanta
作者 Santos  João Rodrigo  Santos  João L M  Lima  José L F C 

文献标题 水和蔬菜中硝酸盐的单界面流动电位检测系统。
Single interface flow system with potentiometric detection for the determination of nitrate in water and vegetables.

文献摘要

本文首次将电位检测的单界面流动系统(SIFA)应用于水和植物提取物中硝酸盐的测定。利用SIFA系统的分析潜力,不仅可以将样品输送至检测,还可以以可重复和自动化的方式执行与样品预处理相关的任务,即离子强度、pH值调整和干扰物种抑制。进一步讨论并强调了SIFA系统与电位法相结合的优点,即简单、易于实现和自动化。结果表明,两种样品的相对偏差均小于5%,采样率约为40h(-1)。此外,还提出了一种新颖而直接的方法来构建具有管状结构的塑料膜离子选择电极,该电极可与基于流动的分析系统耦合。所开发的方法,包括将电极装配在流量管连接器内,实施非常简单,鲁棒性强,特别适合与流量方法相结合,并保持了先前装配过程所显示的所有动态和分析特性。


In this work a single interface flow system (SIFA) with potentiometric detection was for the first time implemented and applied to the determination of nitrate in waters and plant extracts. The analytical potential of the SIFA system was exploited not only to transport the sample towards detection but also to carry out, in a reproducible and automated way, the tasks associated with sample pre-treatment, namely ionic strength, pH adjustment and interfering species suppression. The advantageous aspects of combining a SIFA system with potentiometry with enhanced simplicity, ease of implementation and automation were further discussed and emphasised. The obtained results showed relative deviations lower than 5%, for both types of samples, with sampling rates of about 40h(-1). In addition, an innovative and straightforward process for constructing plastic membrane ion selective electrodes with a tubular configuration able to be coupled to flow-based analytical systems is also proposed. The developed approach, consisting of assembling the electrode inside a flow tubing connector is very simple to implement, robust, particularly adequate to be combined with flow methodologies and maintains all dynamic and analytical characteristics exhibited by previous assembling processes.


获取全文 10.1016/j.talanta.2009.09.031