Multiway Processing of Data Generated with a Potentiometric Electronic Tongue in a SIA System

作者：Cartas Raul; Mimendia Aitor; Legin Andrey; del Valle Manel^*

来源：Electroanalysis, 2011, 23(4): 953-961.

DOI：10.1002/elan.201000642

• Potentiometry
• SIA
• Multivariate calibration
• Multiway
• N-PLS2

In this work a potentiometric electronic tongue based on an array of three Ion Selective Electrodes (ISEs) as sensor elements and multiway partial least squares (N-PLS2) regression method as processing tool has been developed for simultaneous quantification of Cd(2+), Cu(2+) and Pb(2+) in aqueous solution mixtures. The sensor array was formed by two chalcogenide glass sensors selective to Cd(2+) and Cu(2+) plus one PVC membrane sensor selective to Pb(2+). Preparation, measurement and injection of samples in a step profile were performed by an automated SIA system. Concentration range covered was 1.05 mu M to 29.8 mu M for Cd(2+), 0.05 mu M to 1.5 mu M for Cu(2+) and 0.55 mM to 14.7 mu M for Pb(2+). Potentiometric recordings were arranged into a three-way array and treated by N-PLS2 regression method to obtain the calibration model. Prediction ability yielded RMSE values as low as 4.20 +/- 0.37 mu M, 0.094 +/- 0.007 mu M and 0.915 +/- 0.006 mu M, and correlation coefficients from linear regression analysis of 0.82 +/- 0.038, 0.97 + 0.005 and 0.97 + 0.004 for Cd(2+), Cu(2+) and Pb(2+), respectively.

• 出版日期2011-4