TY - GEN
T1 - Analysis of organic and inorganic anions by a novel capillary electrophoresis-PEDOT based amperometric detection method
AU - Feito, Rodrigo Fernandez
AU - Dinsdale, Richard
AU - Guwy, Alan
N1 - Funding Information:
ACKNOWLEDGMENT This work was part supported by the Natural Environment Research Council (NERC) [:NE/L014106/1]; through the Resource Recovery from Waste Programme, in the Microbial Electrochemical Technology for Resource Recovery (MeteoRR) project; the EPSRC Multi-diciplinary fuels, RCUK Energy programme [EP/N009746/1], Liquid fuels and bioenergy from CO2 Reduction (Lifes-CO2R) project; and the FLEXIS research project (grant number: WEFO 80835).
Publisher Copyright:
© 2019 IEEE.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/1/13
Y1 - 2020/1/13
N2 - A novel amperometric detection method based on the use of poly(3,4-ethylenedioxythiophene) (PEDOT) coated electrodes for the determination of organic and inorganic anions subsequent separation by capillary electrophoresis is presented. The analyte peak arises from the difference in the doping capability between the analytes and the buffer co-ion that affects the polymer oxidation kinetics and therefore the sampled current. A contactless conductivity detector was used simultaneously to directly compared both detection methods. LODs of 1.1, 2.6 and 4.1 μM and 2.1, 3.6 and 4.5 μM for acetate, propionate and butyrate were achieved with the PEDOT based detection method and the contactless conductivity detector respectively. Moreover, improved LODs for Cl- and NO3- and worsened LODs for SO42- and PO43- were obtained with the PEDOT based detection method which was found to perform better than the contactless conductivity detector for the determination of ions with a small effective radius. The PEDOT based detection method is very promising for its application in microfluidic devices and the development of new portable sensors for in situ analysis.
AB - A novel amperometric detection method based on the use of poly(3,4-ethylenedioxythiophene) (PEDOT) coated electrodes for the determination of organic and inorganic anions subsequent separation by capillary electrophoresis is presented. The analyte peak arises from the difference in the doping capability between the analytes and the buffer co-ion that affects the polymer oxidation kinetics and therefore the sampled current. A contactless conductivity detector was used simultaneously to directly compared both detection methods. LODs of 1.1, 2.6 and 4.1 μM and 2.1, 3.6 and 4.5 μM for acetate, propionate and butyrate were achieved with the PEDOT based detection method and the contactless conductivity detector respectively. Moreover, improved LODs for Cl- and NO3- and worsened LODs for SO42- and PO43- were obtained with the PEDOT based detection method which was found to perform better than the contactless conductivity detector for the determination of ions with a small effective radius. The PEDOT based detection method is very promising for its application in microfluidic devices and the development of new portable sensors for in situ analysis.
KW - Amperometric detection
KW - Capillary electrophoresis
KW - electrochemical sensor
KW - inorganic anions
KW - PEDOT films
KW - Volatile fatty acids
U2 - 10.1109/SENSORS43011.2019.8956908
DO - 10.1109/SENSORS43011.2019.8956908
M3 - Conference contribution
AN - SCOPUS:85078694856
T3 - Proceedings of IEEE Sensors
BT - 2019 IEEE Sensors, SENSORS 2019 - Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 18th IEEE Sensors, SENSORS 2019
Y2 - 27 October 2019 through 30 October 2019
ER -