Published August 1977 | Version v1
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The transport mechanism DC arcs in advanced spectroanalysis

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Description

This report presents some basic investigations concerning the emission spectroanalysis of powder specimens with application of a new type of advanced DC arcs which operate in horizontally arranged graphite cylinders. The extremely low detection limits found by experiment for various elements (Be, Cd, In, Pb, Sn) suggest a beneficial and reflector like effect of the graphite cylinder on the transport process in the arc plasma. Experiments in detail and by using radioactive tracers (Ag-110, Cd-115, Co-56, Fe-59, Zn-65) lead to an element specific modified model of the effective mechanism of the new arc arrangement. Elements of favourable thermochemical properties produce about three times as much of the average particle density in the arc plasma with the effect of the graphite cylinder. Besides these effects the element specific properties of the graphite cylinder are remarkably invariable towards magnetic fields (1,24 . 10-2T bzw. 2,6 . 10-4T) and various additives (Ga2O3, Li2Co3, NaCl) to the test specimens. (orig.)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

In der vorliegenden Arbeit werden grundlegende Untersuchungen an einem neuartigen Typ fortgeschrittener, in horizontalen Grafitzylindern brennender Gleichstromlichtboegen zur Emissionsspektralanalyse pulverfoermiger Proben dargestellt. Die experimentell erzielten extrem niedrigen Nachweisgrenzen fuer verschiedene Elemente (Be, Cd, In, Pb, Sn) lassen auf einen positiven, reflektoraehnlichen Einfluss des Grafitzylinders auf die Transportprozesse im Bogenplasma schliessen. Detaillierte Untersuchungen mit Hilfe radioaktiver Tracer (Ag-110, Cd-115, Co-56, Fe-59, Zn-65) fuehren zu einer elementspezifisch modifizierten Modellvorstellung ueber den Wirkungsmechanismus dieser neuartigen Bogenanordnung. Fuer Elemente mit guenstigen thermochemischen Eigenschaften wird durch den Einfluss des Grafitzylinders die mittlere Teilchendichte im Bogenplasma etwa verdreifacht. Darueber hinaus zeigen die elementspezifischen Eigenschaften des Grafitzylinders eine weitgehende Invarianz gegenueber den Einfluessen von magnetischen Feldern (1.24 . 10-2T bzw. 2.6 . 20-4T) und verschiedenen Zusaetzen (Ga2O3, Li2CO3, NaCl) zur Probensubstanz. (orig.)

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Additional details

Additional titles

Original title (German)
Ueber Transportvorgaenge in fortgeschrittenen Gleichstromlichtboegen der Spektralanalyse

Publishing Information

Imprint Pagination
92 p.
Report number
Juel--1449

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
9375520
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
ARC FURNACES; CARBIDES; CHEMICAL REACTION KINETICS; CRUCIBLES; DIFFUSION; ELECTRIC ARCS; EMISSION SPECTROSCOPY; GRAPHITE; IRON; PLASMA; QUANTITATIVE CHEMICAL ANALYSIS; RADIOMETRIC ANALYSIS; REFLECTION; SILVER; TRACE AMOUNTS
Descriptors DEC
CARBON; CARBON COMPOUNDS; CHEMICAL ANALYSIS; CURRENTS; ELECTRIC CURRENTS; ELECTRIC DISCHARGES; ELEMENTS; FURNACES; KINETICS; METALS; NONMETALS; REACTION KINETICS; SPECTROSCOPY; TRANSITION ELEMENTS

Optional Information

Notes
38 figs.; 7 tabs.; 87 refs.