Претраживање
Приказ резултата 1551-1560 од 1724
Cretaceous-Paleogene boundary Fish Clay at Hojerup (Stevns Klint, Denmark): trace metals in kerogen
(Bulletin de La Societe Geologique de France, 2007)
Geochemical analyses of trace metals (Ir, Ni, Co, Cr, Zn, Au and Pb) and rare earth elements (La, Ce, Nd, Sm, Eu, Tb, Yb and Lu) in kerogen of the black marl at the Cretaceous-Paleogene boundary Fish Clay at Hojerup have ...
Metal extraction from Cetraria islandica (L.) Ach. lichen using low pH solutions
(Journal of the Serbian Chemical Society, 2008)
Extraction of metals (K, Al, Ca, Mg, Fe, Cu, Ba, Zn, Mn and Sr) from dry Cetraria islandica (L.) Ach. lichen was performed using solutions similar to acid rain (solution A - H2SO4-HNO3-(NH4)(2)SO4 and solution B - ...
A spectroscopic investigation of spatial symmetry of radiation in the U-shaped DC argon plasma with aerosol supply
(Spectroscopy Letters, 2008)
Radial distributions of plasma parameters, temperature, and electron number density, together with radial distribution of analyte absorption and emission, were investigated in order to obtain insight into the radial symmetry ...
A power interruption technique for investigation of temperature difference in stabilized low direct-current arc burning in pure argon on atmospheric pressure
(Chinese Physics Letters, 2008)
Plasma of argon stabilized arc column, in a current range 3-11 A, is investigated using emission spectrometric diagnostic techniques. Temperatures are evaluated using several methods: argon line to adjacent recombinational ...
The Cretaceous-Tertiary boundary Fiskeler at Stevns Klint, Denmark: the geochemistry of the major trace metals
(Journal of the Serbian Chemical Society, 2001)
Trace metals in the four discrete layers of the Cretaceous-Tertiary boundary (Fiskeler) at Stevns Klint (Denmark) are relatively well studied, yet much remains to be learned about them. Therefore, an integrated study of ...
Geochemistry of Ni in the Cretaceous-Tertiary succession Fiskeler (Fish Clay) at Stevns Klint (Denmark): cheto-smectite of the black marl
(Journal of the Serbian Chemical Society, 2006)
The Cretaceus-Tertiary (KT) boundary at Stevns Klint (the Hojerup succession), Fiskeler, consists of a thin red clay layer overlain by a thick one of black marl. These two layers are made up mainly from cheto-smectite and ...
Cretaceous-paleogene boundary fish clay at hojerup (Stevns Klint, Denmark): Zn, Pb and PEE in kerogen
(Journal of the Serbian Chemical Society, 2008)
Geochemical analyses of Zn, Pb and rare earth elements (La, Ce, Nd, Sm, Eu, Tb, Yb and Lu) in the kerogen of the black marl at the Cretaceous - Paleogene boundary Fish Clay at Hojerup were performed. Substantial proportions ...
A power interruption technique for determining the difference between electron and gas temperatures in the argon d.c. arc supplied with aqueous aerosol
(Spectroscopy Letters, 2003)
The difference between electron and gas temperatures in a low current U-shaped d.c. arc with aqueous aerosol supply was studied using a power interruption technique. Monitoring of the temporal evolution of recombination ...
The vanadium isotopic constitution of petroleum asphaltenes: La Luna Formation (Venezuela)
(Journal of the Serbian Chemical Society, 2000)
High resolution mass spectrometry indicates that the isotopic abundance of (50)vanadium (V) of the Late Cretaceous La Luna petroleum asphaltenes and related source kerogen of marine origin (both highly enriched with V GT ...
Some problems connected with boron determination by atomic absorption spectroscopy and the sensitivity improvement
(Journal of the Serbian Chemical Society, 2001)
Two atomizers were compared: an N2O-C2H2 flame and a stabilized U-shaped DC arc with aerosol supply. Both the high plasma temperature and the reducing atmosphere obtained by acetylene addition to the argon stream substantially ...