SAFE VOLTAMMETRIC METHOD FOR THE DETERMINATION OF ARSENIC IONS USING A GOLD ELECTRODE Russian patent published in 2021 - IPC G01N27/48 G01N27/26 

FIELD: analytical chemistry.

SUBSTANCE: invention relates to the field of analytical chemistry of arsenic ions and is aimed at developing a voltammetric method for determining arsenic ions in aqueous solutions. The invention is intended for the practical chemical analysis of arsenic ions in liquid samples (natural surface and waste waters, technological solutions, etc.) and use in environmental, medical and other laboratories performing chemical-analytical determination of arsenic ions. According to the proposed method, a gold wire is used as a working electrode. A negative potential of arsine accumulation is set - 1000 mV for 60-80 s and a potential sweep in the anodic direction at a speed of 60-100 mV/s and an analytical signal is recorded in the mode of alternating-current voltammetry using a voltammetric analyzer, an analytical signal in the form of a peak with a maximum limiting diffusion current oxidation of elemental arsenic to its oxide at potentials +50…+200 mV relative to the silver chloride reference electrode and the auxiliary platinum electrode.

EFFECT: use of a gold working electrode, which provides a satisfactory response factor and does not require the introduction of gold ions as a collector.

1 cl, 4 dwg