![]()
AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
|
|||||||
Rezumat articol ediţie STUDIA UNIVERSITATIS BABEÅž-BOLYAI În partea de jos este prezentat rezumatul articolului selectat. Pentru revenire la cuprinsul ediţiei din care face parte acest articol, se accesează linkul din titlu. Pentru vizualizarea tuturor articolelor din arhivă la care este autor/coautor unul din autorii de mai jos, se accesează linkul din numele autorului. |
|||||||
STUDIA CHEMIA - Ediţia nr.1-2 din 2001 | |||||||
Articol: |
SPECTROPHOTOMETRIC DETERMINATION OF TUNGSTEN (V) AS THIOCYANATE COMPLEX IN CERTIFIED STEEL MATERIALS. Autori: FRENÅ¢IU TIBERIU, MICHAELA PONTA, EMIL CORDOÅž. |
||||||
Rezumat: The method is based on the photometric determination of tungsten (V)-thiocyanate complex (420 nm, absorptivity coefficient 35 l g-1 cm-1) after the reduction of W(VI) with SnCl2 and TiCl3. The method was applied to determine W in steel samples dissolved in Speacker reagent. The kinetics of the complex development and the interference of Mo on W determination were studied for ratios of Mo:W up to 2:1. The calibration curve was linear in the range 5-25 g ml–1 W, with a correlation coefficient of 0.994 (n=5) and a detection limit of 1g ml-1 W. For a certified content of 17.7% W in steel, the recovery was 992% and the relative standard deviation 2% (n=5). The method allows the determination of W in the presence of Mo up to a Mo/W ratio (m/m) of 1/2. | |||||||
![]() |
|||||||
![]() |