METHOD OF DETERMINING SILVER BY CATHODE VOLTAMMETRY Russian patent published in 2016 - IPC G01N27/48 

FIELD: chemistry.

SUBSTANCE: invention discloses a method of determining silver via cathode voltammetry of background solution containing 4.5 ml of 1 M KNO₃ and 0.5 ml of 0.1 M sodium ethylene diamine tetraacetate (EDTA), from formed complex compound on glassy-carbon electrode. On indicator electrode is fed potential preliminary electrolysis (+0.5 V), at which maximum value of peak current is recorded, and during accumulation time from 10 to 20 s electro-concentration of analyte onto electrode current peak at potential of +0.04 V to +0.07 V and potential sweep rate of 100 mV/s. Invention enables by an order of 2-3 to reduce lower bound of determined content of up to 2.8·10^-8 M (Sr=0.20), as well as measurement of analytical signal passes in a single step, it speeds up process of determining concentration of silver.

EFFECT: reducing boundary of determined content and faster process of determining concentration of silver.

1 cl, 4 dwg, 3 tbl