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Coulometric determination of chromium, molybdenum, and tungsten by generated lead(II)

D. Kalavská

Department of Analytical Chemistry, Faculty of Natural Sciences, Komenský University, CS-842 15 Bratislava

 

Abstract:  The conditions of electrochemical generation of Pb(II) in the media of KNO3, NH4NO3 or NH4CIO4 and in the media with pH adjusted within the range 7.7—8.1 were studied for the use of precipitation reactions of Pb(II) with Cr042-, MoO42-, and WO42- in the volumetric analysis. The developed procedures of determination were tested with respect to standard solutions of K2CrO4, Na2MoO4, and Na2WO4. The results of coulometric determination of Mo and W in ferromolybdenum and ferrotungsten obtained under proposed conditions were confronted with the results obtained by other methods or by the use of standard ferroalloys.

Full paper in Portable Document Format: 371a53.pdf

 

Chemical Papers 37 (1) 53–59 (1983)

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