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|Title:||Trace metals analysis in molybdenite mineral sample|
|Authors:||Tamrakar, Praveen Kumar|
Pitre, K S
|Abstract:||DC polarography and other related techniques, viz., DPP and DPASV have been sucessfully used for the simultaneous determination of trace metals in. molybdenite mineral sample. The polarograms and voltammograms of sample solution have been recorded in 0.1 M (NH4)2 tartrate supporting electrolyte at two different pH values i.e., 2.7 ±0.1 and 9.0 ± 0.1. The results indicate the presence of Cu2+, Mo6+,Cd2+ Ni2+ ,In3+, Fe3+ and W6+ metal ions in the sample. For the determination of tungsten(VI), 11 M HCl has been used as supporting electrolyte. Tungsten(VI) produces a well defined wave/peak with E1/2/EP=-0.42V/-0.48V vs SCE in 11 M HCl. The quantitative analysis by the method of standard addition shows the mineral sample to have the following composition, Cu2+ (14.83), Mo6+ (253.70), Cd2+ (41.36), Ni2+ (16.08), In3+(3.06), Fe3+ (83.00) and W6+ (4.14 )mg/g of the sample. Statistical treatment of the observed voltammetric data reveals high accuracy and good precision of determination. The observed voltammetric results are comparable with those obtained using AAS method.|
|Appears in Collections:||IJC-A Vol.39A(05) [May 2000]|
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