An ionic liquid-based sensor for diclofenac determination in water |
| |
Authors: | Emma Brennan Pauline Futvoie John Cassidy |
| |
Affiliation: | 1. Applied Electrochemistry Group, Dublin Institute of Technology, FOCAS Institute, Camden Row, Dublin, Ireland;2. Départements de Biologie médicale et Chimie, Haute Ecole Leonard de Vinci, Woluwe-Saint-Lambert, Belgium |
| |
Abstract: | This paper details a miniaturised, solid state ion-selective electrode selective for diclofenac. The sensor comprises a novel ionic liquid electroactive material – an imidazolium–diclofenac ion associate. The ion associate is present in a plasticised poly(vinyl chloride) (PVC) membrane on planar carbon electrodes, with an intermediate poly(3,4-ethylenedioxythiophene) layer. The sensitivity and selectivity of the sensor were determined using chronopotentiometric methods. In response to diclofenac, a slope of ?53.3 ± 3.6 mV/dec was observed. A limit of detection of 2.90 × 10?3 g L?1 is reported, with a linear range of 3.18 × 10?3 g L?1 to 3.18 g L?1. The sensors show good selectivity towards diclofenac against pertinent interferent molecules, with a response time of <15 s. |
| |
Keywords: | Sensor potentiometric diclofenac ISE environmental ionic liquid |
|
|