SAFE VOLTAMMETRIC METHOD OF DETERMINING BISMUTH (III) Russian patent published in 2019 - IPC G01N27/48 

FIELD: chemistry.

SUBSTANCE: invention relates to analytical chemistry of elements, specifically methods of determining bismuth (III) and can be used for sanitary-epidemiological monitoring of drinking water, water bodies, as well as analytical control of bismuth in waste water of various chemical industries and household water. Substance of the invention consists in the fact that an acidified analyzed solution is added with an alkaline solution of sodium, covered with a plug, shake and left for 5 minutes to restore all forms of bismuth to BiH₃ bismuth hydride. Adsorption method of bismuth hydride is accumulated on working electrode from analyzed solution (background electrolyte and prepared sample) at programmed values of potential. Electrolysis is followed by turning potential in anode direction in stepwise scanning mode. Signal of electrochemical oxidation is recorded in the form of voltamperograms and bismuth content in the sample is calculated using a calibration curve.

EFFECT: invention provides a safe method in which the limit of detection of bismuth 0_02 mcg/cm³, and the range of determined contents is within range of 0,02–0,5 mcg/cm³.

1 cl, 2 dwg, 1 tbl