Extractive Differential Pulse Polarography of Mo (VI) Oxinate in Chloroform and its Application in the Determination of Molybdenum in Steel

Abstract

<em>The voltammetric characteristics of Mo (VI) oxinate at the mercury electrode, in the presence of tri-butylammonium perchlorate (tri-BAP) and piperidinium perchlorate (PP) + piperidine (P) as two different types supporting electrolytes, have been studied in chloroform. With the both supporting electrolytes a two electron irreversible process for the reduction of Mo (VI) oxinate was observed. Preceded by a solvent extraction of Mo (VI) oxinate in chloroform, the DP method was used for the determination of molybdenum. In the presence of 0.2 M tri-BAP as supporting electrolyte, the calibration graph was linear over the range 0.5 to 50 </em><em>mM. and the detection limit was 0.16 </em><em>mM about 10 times lower than the case of PP + P. The proposed method using Mo (VI) oxinate-tri-BAP system has been successfully applied for the determination of molybdenum in steel.</em>