EXPERIMENTAL EVALUATION OF RECURSIVE ESTIMATION APPLIED TO LINEAR SWEEP ANODIC-STRIPPING VOLTAMMETRY FOR REAL-TIME ANALYSIS

The recursive estimation technique known as the Kalman filter has been experimentally verified for linear sweep anodic stripping voltammetry (LSASV) at hanging mercury drop (HMDE) and thin film mercury (TFME) electrodes. Synthetic lead samples were employed for a critical comparison between this real time recursive estimation technique and traditional nonreal time digital filtering techniques. The recursive technique generally returned concentration estimates which were of greater precision than the other digital methods for LSASV at an HMDE and of comparable precision for LSASV at a TFME. The limits of detection for these techniques (0.4 ppb) were found to be governed by the exogenous background concentration of the analyte rather than the technique per se. © 1979, American Chemical Society. All rights reserved.