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 (Cd2+) 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 Cd2+ concentrations spanning two orders of magnitude and interfering ions (Al3+ (less interfering), Fe2+ (moderately interfering) and Cr6+ (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 -Delta G(ads) values were evaluated. A correlation obtained from the sensitivity parameters from the BW and PR techniques and -Delta G(ads) yielded an interference scale with a resolution higher than that of the scale obtained by the PR technique or the BW technique. (C) 2018 The Electrochemical Society.