Large amounts of carbon, sulfur and nickel in the black rock affect the collection and operation of bismuth assays. Adding potassium nitrate, iron powder and silver nitrate and potassium tellurite can eliminate the influence of carbon and sulfur, and the bismuth buckle can be quickly peeled during the first soot blowing, and the smooth and round silver tellurium particles can be obtained after the second soot blowing. After the bismuth buckle was dissolved in nitric acid and hydrochloric acid, platinum, palladium and gold in solution were determined by ICP-AES, and their recovery rates were more than 97%. The detection limits of Pt, Pd and Auwere 0.020 μg/g, 0.020 μg/g and 0.021 μg/g, respectively. The relative error (RE) of the determination results for reference materials is -4.31%~3.77%, and the relative standard deviation (RSD) is all less than 6.92%. |