Determination of Asenic,Antimony,and Bsmuth in Cude Cpper by Lnthanum Ntrate Erichment Mthod
The crude copper sample in this article was dissolved in nitric acid,and a certain amount of lanthanum was added to the dissolved test solution.Ammonium hydroxide and lanthanum nitrate were added to precipitate and enrich arsenic,antimony,and bismuth in an ammonia medium,and copper was separated.The precipitation of lanthanum nitrate is dissolved in hot dilute hydrochloric acid,and a portion of the solution is taken after being made to volume.Ascorbic acid is added to reduce the high valent arsenic antimony bismuth ions to trivalent,and residual copper is masked with thiourea.In a hydride generator,arsenic,antimony,and bismuth are reduced to hydrides by potassium borohydride.Argon gas is introduced into the atomizer,and the corresponding fluorescence intensity is measured on an atomic fluorescence spectrometer using a high-performance hollow cathode lamp as the light source.This method has a wide measurement range,good stability,and high accuracy in the results.
万方数据
维普
