Abstract
Voltammetric sensing of analytes in biological fluids is frequently accompanied by non-linear effects due to the analyte/matrix interactions. A theoretical approach is developed to describe such effects when standard addition methods are applied. Several asymptotic models are described considering equilibrium-like and kinetic-like interaction models and possible co-diffusion effects. Experimental data for non-linear features which appear in voltammetric sensing of serotonin and noradrenalin in urine are in satisfactory agreement with theoretical predictions.
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