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首页> 外文期刊>Sensors and Actuators >Characteristics Of A Cobalt-based Phosphate Microelectrode For In Situ Monitoring Of Phosphate And Its Biological Application
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Characteristics Of A Cobalt-based Phosphate Microelectrode For In Situ Monitoring Of Phosphate And Its Biological Application

机译：钴基磷酸盐微电极的原位监测特性及其生物学应用

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摘要

The in situ monitoring of phosphate has been of great importance in many environmental applications, particularly those involving biological treatment processes and eutrophication monitoring. A microelectrode with small tip size (～10 μm) was fabricated with cobalt wire, characterized and evaluated for in situ and in vivo environmental analysis of phosphate in biological applications. The electrochemical performance of this cobalt-based microelectrode was fully examined for its characteristics, including detection limit, response time, selectivity, reproducibility, life time, interference with pH, ions and dissolved oxygen (DO), and the stirring effect. The microelectrode showed excellent selectivity for the ortho-phosphate ions (HPO_4~(2-) and H_2PO_4-) in various environmental conditions. Alkalinity and DO were found to interfere with electrode response to phosphate. The phosphate microelectrode was also evaluated with scanning electron microscopy (SEM) and cyclic voltammetry (CV). The developed microelectrode was used for in situ monitoring of phosphate in microbial flocs. Well-defined phosphate profiles across the flocs were observed under anaerobic (phosphorus release) conditions. This full characterization and successful application showed that the cobalt-based phosphate microelectrodes can be a very useful tool for in situ measurement of phosphate in various environmental conditions, including within microbial flocs.
机译：在许多环境应用中，特别是涉及生物处理过程和富营养化监测的环境应用中，磷酸盐的原位监测一直非常重要。用钴丝制备了具有小尖端尺寸（〜10μm）的微电极，对其进行了表征和评估，以用于生物应用中磷酸盐的原位和体内环境分析。对该钴基微电极的电化学性能进行了全面检查，包括其检测限，响应时间，选择性，重现性，寿命，对pH，离子和溶解氧（DO）的干扰以及搅拌效果等特征。在不同的环境条件下，微电极对正磷酸根离子（HPO_4〜（2-）和H_2PO_4-）具有极好的选择性。发现碱度和溶解氧会干扰电极对磷酸盐的反应。还通过扫描电子显微镜（SEM）和循环伏安法（CV）评估了磷酸盐微电极。开发的微电极用于微生物絮凝物中磷酸盐的原位监测。在厌氧条件下（磷释放），在絮凝物上观察到了清晰的磷酸盐分布。这种全面的表征和成功的应用表明，钴基磷酸盐微电极可以成为在各种环境条件下（包括微生物絮凝体中）就地测量磷酸盐的非常有用的工具。

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