METHOD FOR DETERMINING SILVER, PLATINUM AND PALLADIUM IN PALLADIUM POWDER WITH HIGH SILVER ASH CONTENT

A method for determining silver, platinum and palladium in a palladium powder with a high silver ash content. The method comprises the following steps: 1) weighing a sample, adding hydrochloric acid and hydrogen peroxide thereto to dissolve same, and filtering same to obtain a first filtrate and first filter residues; 2) adding hydrochloric acid and hydrogen peroxide to the first filter residues to dissolve same, filtering same, repeating the operations multiple times, collecting a filtrate and second filter residues, and combining the filtrate resulting from the filtration with the first filtrate to obtain a second filtrate; 3) washing the second filter residues with water multiple times, filtering same to obtain third filter residues, and combining the resulting filtrate with the second filtrate to obtain a third filtrate; (4) dropwise adding a reducing agent and water to the third filter residues to dissolve same at a low temperature, discarding a liquid and keeping residues, and repeating the operations m