DETERMINATION OF TRACE SILVER IN SEAWATER BY DIFFERENTIAL PULSE ANODIC STRIPPING VOLTAMMETRY METHOD WITH GLASSY CARBON-GOLD MEMBRANE ELECTRODE IN THE CASE OF LAMINAR FLOW

This paper presents a new method to determine trace silver in seawater, the Differential pulse Anodic Stripping Voltammetry Method with Glassy Carbon-Gold Membrane Electrode in the Case of Laminar Flow, together with the description of its electrode structure, its principles and experimental conditions.Experimental results show that the reproducibility of glassy carbon electrode has been improved and the sensibility of determination of trace silver increased by combining the glassy carbon-gold membrane electrode with differential pulse stripping method in the case of laminar flow.
Determination could be conducted in non-preenriched natural seawater sample with an addition of HNO₃ to 0.005 M and adistinct differential pulse anodic stripping peak be revealed.Sensibility is 2×10^-10M, standard deviation (in six repeated tests) is ±2%, and recovery rate is 85-96%.Satisfactory results have been obtained in the determination of samples from the Xiamen Harbor and the high seas.