SciELO - Scientific Electronic Library Online

vol.63Synthesis, spectroscopic and pharmacological studies of bivalent copper, zinc and mercury complexes of thioureaIodination of alcohols over Keggin-type heteropoly compounds: A simple, selective and expedient method for the synthesis of alkyl lodides índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados



Links relacionados

  • En proceso de indezaciónCitado por Google
  • En proceso de indezaciónSimilares en Google


South African Journal of Chemistry

versión On-line ISSN 1996-840X
versión impresa ISSN 0379-4350


NETE, Motlalepula; PURCELL, Walter; SNYDERS, Ettienne  y  NEL, Johann T.. Alternative dissolution methods for analysis of niobium containing samples. S.Afr.j.chem. (Online) [online]. 2010, vol.63, pp.130-134. ISSN 1996-840X.

Inductively coupled plasma optical emission spectrometry was applied for the qualitative and quantitative analyses of the different high purity Nb containing samples such as Nb metal, Nb2O5 and NbF5. Microwave-assisted digestion of the Nb compounds with concentrated H2SO4 in PTFE vessels produced Nb recoveries of 99.90 ± 0.08 % for Nb metal, 98.8 ± 0.7 % for Nb2O5 and 100.7 ± 0.4 % for NbF5. Fusion of Nb2O5 with Li2B4O7 flux and the subsequent dissolution of the melt with concentrated H2SO4 resulted in the precipitation of H3BO3 under these conditions. Methanol was added to the reaction mixture to convert the boric acid into the volatile methyl ester in an effort to remove the excess H3BO3. This procedure yielded a recovery of 103±2%for the pure Nb2O5 sample.

Palabras clave : Niobium samples; microwave dissolution; fusion dissolution; qualitative analysis; quantitative analysis; validation.

        · texto en Inglés     · Inglés ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons