title: Potentiometric electronic tongue-flow injection analysis system for the monitoring of heavy metal biosorption processes.
abstract: 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 Cu(2+) ions in a fixed-bed column configuration. The ET is formed by a 5-sensor array with Cu(2+) and Ca(2+)-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 Cu(2+) and the cation exchanged and released (Ca(2+)) 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 Cu(2+) ion-biosorption process, through obtaining its breakthrough curves, and the profile of the Ca(2+) 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.
authors.affiliation: Sensors and Biosensors Group, Chemistry Dept., Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Wilson
authors.forename: M
authors.initials: M
authors.lastname: del Valle
authors.forename: S
authors.initials: S
authors.lastname: Alegret
authors.forename: C
authors.initials: C
authors.lastname: Valderrama
authors.forename: A
authors.initials: A
authors.lastname: Florido
mesh_terms: D001673:Biodegradation, Environmental; D002118:Calcium / Q000737:chemistry; D003300:Copper / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D055615:Electrical Equipment and Supplies; D004785:Environmental Pollutants / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D017022:Flow Injection Analysis / Q000295:instrumentation*; D007474:Ion Exchange; D016571:Neural Networks, Computer; D011199:Potentiometry / Q000295:instrumentation*; D013997:Time Factors; D014675:Vegetables / Q000378:metabolism*; D027843:Vitis / Q000378:metabolism*; D014867:Water / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D014867:Water; D003300:Copper; D002118:Calcium