Determination of Trace Amounts of Gold in Environmental Samples by Adsorptive Stripping Voltammetry of Its Complex with Rhodamine Using Osc-Pls

Abstract

The multivariate calibration method was applied for the determination of trace amounts of gold based on a hanging
mercury drop electrode (HMDE) in the presence of rhodanine, followed by reduction of adsorbed gold by voltammetric scan
using differential pulse modulation The optimum experimental conditions are: rhodanine concentration of 0.20 g mL-1, pH
5.0, accumulation potential of -600 mV versus Ag/AgCl, accumulation time of 100 sec, scan rate of 30 mV s-1 and pulse
height of 100 mV. The calibration matrix for partial least squares (PLS) regression was designed with 9 samples. Orthogonal
signal correction (OSC) is a preprocessing technique used for removing the information unrelated to the target variables based
on constrained principal component analysis. OSC is a suitable preprocessing method for PLS calibration without loss of
prediction capacity using electrochemical method. The RMSEP for gold determination with PLS and OSC-PLS were 8.51 and
1.94, respectively. This procedure allows the determination of gold in synthetic and real samples with good reliability of the
determination.