Optimization of high-current DC arc excitation in controlled atmosphere for the spectrographic analysis of biological matrix

1984 ◽  
Vol 319 (3) ◽  
pp. 307-308 ◽  
Author(s):  
M. I. Marinov
Keyword(s):  
Controlled Atmosphere ◽  
Spectrographic Analysis ◽  
High Current ◽  
Biological Matrix ◽  
Dc Arc ◽  
Arc Excitation

The Practical Analysis of High-Purity Chemicals. VI. Emission Spectrographic Analysis of High-Purity Acids

1971 ◽  
Vol 25 (5) ◽  
pp. 542-549 ◽  
Author(s):  
N. A. Kershner ◽  
E. F. Joy ◽  
A. J. Barnard
Keyword(s):  
High Purity ◽  
Internal Standard ◽  
Spectrographic Analysis ◽  
Multielement Standard ◽  
Elapsed Time ◽  
Three Samples ◽  
Mineral Acids ◽  
Dc Arc ◽  
Concurrent Analysis ◽  
Arc Excitation

The spectrographic analysis of volatile acids in a high-purity form is reviewed and a procedure presented that involves evaporation of a 100-g sample under temperature controlled contamination-free conditions and emission spectrography using dc-arc excitation under controlled atmosphere. In the evaporation, graphite (10 mg) is added as a collector, sulfuric acid to convert to less volatile sulfates (with acetic, hydrochloric, and nitric acids), and also mannitol to retain boron (with hydrochloric and hydrofluoric acids). Indium is added as a internal standard. Spectra are examined for 33 elements against a multielement standard in graphite containing indium as an internal standard. For the concurrent analysis of three samples, the elapsed time is 4–10 h and the actual working time 3–5 h. Recovery studies are reported as well as the use of the procedure in the assessment of the leaching of borosilicate glass by concentrated mineral acids.

Use of a High Current dc Arc for Trace Element Spectrographic Analysis of Ashed Biological Materials

1969 ◽  
Vol 23 (4) ◽  
pp. 349-353 ◽  
Author(s):  
G. H. Morrison ◽  
R. K. Skogerboe ◽  
A. J. Bedrosian ◽  
A. M. Rothenberg
Keyword(s):  
Trace Element ◽  
Dry Weight ◽  
Biological Materials ◽  
Weight Basis ◽  
Spectrographic Analysis ◽  
High Current ◽  
Analytical Curve ◽  
Different Types ◽  
Dc Arc ◽  
Better Than

The advantages that can be realized through the use of a high current dc arc for the emission spectrographic analysis of ashed biological materials are presented. The method described utilizes 5–10 mg of ash per analysis and provides detection limits between 1 and 50 parts per billion (on the original dry weight basis) for a large number of elements. The precision estimates of the method, based on four replicate analyses, are generally better than ±20% and comparative analyses suggest that the accuracies are within these limits. Data is presented which supports the possibility of using a single analytical curve for several different types of ashed biological materials.

Automatic Control of the Arc Gap in DC Arc-Emission Spectrographic Analysis

1969 ◽  
Vol 1 (3) ◽  
pp. 313-322 ◽  
Author(s):  
A. Schuringa ◽  
J. Kroonen ◽  
E. Donkersloot ◽  
A. Werumeus Buning
Keyword(s):  
Automatic Control ◽  
Spectrographic Analysis ◽  
Dc Arc

High-current impulse argon arc method for the spectrographic analysis of microsamples

1968 ◽  
Vol 40 (10) ◽  
pp. 1534-1540 ◽  
Author(s):  
Vratislav. Svoboda ◽  
Imrich. Kleinmann
Keyword(s):  
Spectrographic Analysis ◽  
High Current ◽  
Current Impulse

Nano-crystalline CVD diamond films deposited on cemented carbide using high current extended DC arc plasma process

Vacuum ◽  
2008 ◽  
Vol 82 (5) ◽  
pp. 543-546 ◽  
Author(s):  
X.M. Meng ◽  
S.J. Askari ◽  
W.Z. Tang ◽  
L.F. Hei ◽  
F.Y. Wang ◽  
...  
Keyword(s):  
Diamond Films ◽  
Cvd Diamond ◽  
Cemented Carbide ◽  
Arc Plasma ◽  
High Current ◽  
Plasma Process ◽  
Nano Crystalline ◽  
Dc Arc

Suppression of Selective Volatilization in a Method for the Spectrographic Analysis of Lanthanum

1966 ◽  
Vol 20 (2) ◽  
pp. 107-112 ◽  
Author(s):  
A. B. Whitehead ◽  
B. C. Piper ◽  
H. H. Heady
Keyword(s):  
Standard Deviation ◽  
Rare Earths ◽  
Analytical Method ◽  
Operating Conditions ◽  
Spectrographic Analysis ◽  
Metal Sample ◽  
Relative Standard ◽  
Arc Current ◽  
Impurity Elements ◽  
Dc Arc

The effects of electrode type, arc current, and the Stallwood Jet on selective distillation of impurities other than rare earths in La2O3 are evaluated. Selective volatilization is reduced by use of a 20-A dc arc with a ⅛-in.-diam electrode. An analytical method incorporating these operating conditions is presented for 19 impurity elements in La2O3 prepared from the lanthanum metal sample. The overall precision is about ±14% relative standard deviation over the concentration range of 30 to 1000 parts per million.

Emission Spectrographic Analysis of Tantalum Thin Films

1967 ◽  
Vol 21 (6) ◽  
pp. 364-367 ◽  
Author(s):  
J. D. Nohe
Keyword(s):  
Thin Films ◽  
Electron Beam ◽  
Electron Beam Evaporation ◽  
Graphite Substrate ◽  
Resistance Heating ◽  
Spectrographic Analysis ◽  
Metallic Films ◽  
Similar Composition ◽  
Dc Arc

A dc-arc technique is described for the analysis of impurities in tantalum thin films. Films are sputtered directly on ultrapure graphite substrates, heat oxidized, and removed mechanically. Graphite is employed as the buffer, and samples are compared to standards of similar composition. The graphite-substrate technique has been applied to films of other metals produced by sputtering, resistance-heating evaporation, and electron-beam evaporation. Only portions of the spectrographic procedure are modified for different metallic films.

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