Acta Chimica Sinica ›› 1964, Vol. 30 ›› Issue (2): 230-232. Previous Articles     Next Articles

电流滴定法测定钨

张悌衡, 曹斐云, 束世明   

  1. 唐山铁道学院
  • 收稿日期:1963-05-24 出版日期:1964-04-15 发布日期:2013-06-03

AMPEROMETRIC TITRATION OF TUNGSTEN WITH EDTA

CHANG T'I-HENG, TSAO FEI-YÜN, SHU SHIH-MING   

  • Received:1963-05-24 Online:1964-04-15 Published:2013-06-03

Disodium EDTA is used in an indirect method for the amperometric titration of tungsten in minerals.This is based on the precipitation of tungsten as lead tungstate.The precipitate is dissolved in 1 M sodium hydroxide and 1 M sodium tartrate.The latter serves also as a supporting electrolyte.Titrate lead ions with 0.05 M disodium EDTA at -0.70 to -0.80 volt in NH3-NH4Cl buffer solution.The amount of tungsten can then be found by calculation.The results found are comparable to those found with ammonium nitrate method.