DC arc excitation — is it obsolete?

1986 ◽  
Vol 324 (6) ◽  
pp. 519-524 ◽  
Author(s):  
J. Fijałkowski
Keyword(s):  
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.

Detection and Estimation of Some Trace Elements by dc-Arc Excitation Using the Vacuum-Cup Technique

1967 ◽  
Vol 21 (1) ◽  
pp. 20-22 ◽  
Author(s):  
Eleanor E. Bevege ◽  
Robert E. Gallion
Keyword(s):  
Trace Elements ◽  
Hydrochloric Acid ◽  
Internal Standard ◽  
Acid Solutions ◽  
Iron Aluminum ◽  
Aqueous Hydrochloric Acid ◽  
Hydrochloric Acid Solutions ◽  
Dc Arc ◽  
Arc Excitation ◽  
Manganese Copper

The dc-arc excitation of aqueous hydrochloric acid solutions of various elements has been studied. Teflon cups of the Zink type were employed. By using the 3089-Å line of the OH band or gallium as an internal standard, boron, mercury, tin, chromium, iron, aluminum, manganese, copper, and zinc in the part-per-million range have been determined.

Comparison of dc Arc and Plasma Arc Excitation to Determine Rhenium in Molybdenite

1966 ◽  
Vol 20 (4) ◽  
pp. 241-243 ◽  
Author(s):  
W. G. Schrenk ◽  
Show-Jy Ho ◽  
D. A. Lehman
Keyword(s):  
Emission Line ◽  
Internal Standard ◽  
Standard Technique ◽  
Plasma Arc ◽  
Proper Functioning ◽  
Dc Arc ◽  
Extracting Solvent ◽  
Arc Excitation

The dc arc is considerably more sensitive than the plasma are in determining rhenium, using the rhenium emission line at 3460.5 Å and cobalt at 3453.5 Å as the internal standard. The plasma arc is twice as precise as the dc arc. The internal standard technique does not increase precision of the plasma arc for rhenium but is useful to indicate proper functioning of the arc aspirator assembly. Use of a 1:1 alcohol—ethanol solvent for rhenium increases sensitivity of plasma arc determinations by a factor or two. The extracting solvent used to remove rhenium from molybdenite, 4-methyl-2-pentanone, is not spectrographically useful in the plasma arc at the wavelengths used for rhenium determination.

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