Potentiometric electronic tongue-flow injection analysis system for the monitoring of heavy metal biosorption processes

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• 作者：D. Wilson^a ; M. del Valle^a ; S. Alegret^a ; C. Valderrama^b ; A. Florido^b ; ^{antonio.florido@upc.edu}
• 关键词：Grape stalk wastes ; Copper sorption ; Ion-selective electrodes ; Flow-injection potentiometry ; Electronic tongue ; On-line monitoring
• 刊名：Talanta
• 出版年：2012
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：15 May, 2012
• 卷：93
• 期：Complete
• 页码：285-292
• 文件大小：919 K

摘要

An automated flow injection potentiometric (FIP) system with electronic tongue detection (ET) is used for the monitoring of biosorption processes of heavy metals on vegetable wastes. Grape stalk wastes are used as biosorbent to remove Cu²⁺ ions in a fixed-bed column configuration. The ET is formed by a 5-sensor array with Cu²⁺ and Ca²⁺-selective electrodes and electrodes with generic response to heavy-metals, plus an artificial neural network response model of the sensor's cross-response. The real-time monitoring of both the Cu²⁺ and the cation exchanged and released (Ca²⁺) in the effluent solution is performed by using flow-injection potentiometric electronic tongue system. The coupling of the electronic tongue with automation features of the flow-injection system allows us to accurately characterize the Cu²⁺ ion-biosorption process, through obtaining its breakthrough curves, and the profile of the Ca²⁺ ion release. In parallel, fractions of the extract solution are analysed by spectroscopic techniques in order to validate the results obtained with the reported methodology. The sorption performance of grape stalks is also evaluated by means of well-established sorption models.