Selectivity is an important performance parameter of sensors. Selectivities of electrochemical sensors to interfering ions have been characterized by reduction of the height of the signal peak which require a large number of experiments, and by the selectivity coefficient techniques which have limitations. In this work, using conducting polymer based sensors and utilizing the calculations of barrier widths at different concentrations, the experimental interference behavior of various ions
Understanding interference effects toward the detection of target analytes is important. In an earlier work we reported for the first time the use of the barrier width (BW) technique using a single concentration of the target analyte (Cd 2+ ) to characterize the interference effects of various heavy metal ions with lesser number of experiments as compared to the conventional stripping current based peak reduction (PR) technique, and developed a scale of interference. There is a need to benchmark the BW technique with the PR technique for its claim of usage and to develop a scale of interference with a higher resolution. In this work, utilizing the BW technique we report the analysis based on Cd 2+ concentrations spanning two orders of magnitude and interfering ions (Al 3+ (less interfering), Fe 2+ (moderately interfering) and Cr 6+ (heavily interfering)) also spanning two orders of magnitude. The sensitivity parameters were benchmarked thereby validating BW technique. Adsorption isotherms were constructed for each case and − G ads values were evaluated. A correlation obtained from the sensitivity parameters from the BW and PR techniques and − G ads yielded an interference scale with a resolution higher than that of the scale obtained by the PR technique or the BW technique.
The key performance parameters for an electrochemical aqueous ion sensor include the limit of detection (LOD) and the selectivity. Novel composite films were synthesized electrochemically from aniline, N-phenylglycine and graphene oxide(GO) to detect heavy metals by square wave voltammetry; and the LOD and interferences from several ions (As
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