SPEED DETERMINATION OF AUTO-ELECTRO-MAGNETIC ROTATION (AEMR) OF DC ARC IN "PLASMALAB" FFP-PLASMA REACTOR

2009 ◽  
Vol 13 (2) ◽  
pp. 165-177
Author(s):  
M. K. Mihovsky ◽  
V. Hadzhiyski
Keyword(s):  
Plasma Reactor ◽  
Magnetic Rotation ◽  
Electro Magnetic ◽  
Dc Arc

Emission Spectrometric Determination of Trace Elements in Biological Fluids

1971 ◽  
Vol 25 (1) ◽  
pp. 53-56 ◽  
Author(s):  
William Niedermeier ◽  
James H. Griggs ◽  
Richard S. Johnson
Keyword(s):  
Experimental Data ◽  
Trace Elements ◽  
Sample Preparation ◽  
Blood Serum ◽  
Biological Fluids ◽  
Spectrometric Method ◽  
Direct Reading ◽  
Iron Aluminum ◽  
Dc Arc

An emission spectrometric method of analysis is described, in which trace quantities of copper, iron, aluminum, barium, manganese, nickel, cesium, tin, strontium, chromium, zinc, lead, molybdenum, and cadmium were determined in blood serum. The sample preparation, starting with 2.0 ml of blood serum, is discussed in detail. The source of excitation was a 10 A dc arc. Quantitation was achieved with a direct reading emission spectrometer. The metal concentration, in micrograms per 100 ml of blood serum, was calculated from the experimental data by means of a computer.

DC Arc Plasma Emission Spectrometric Determination of Boron in Plants

1978 ◽  
Vol 61 (3) ◽  
pp. 504-505
Author(s):  
James R Melton ◽  
William L Hoover ◽  
Patricia A Morris ◽  
Janette A Gerald
Keyword(s):  
Atomic Absorption ◽  
Alkali Metals ◽  
Atomic Absorption Spectrophotometry ◽  
Plasma Emission ◽  
Arc Plasma ◽  
Emission Method ◽  
Absorption Spectrophotometry ◽  
Dc Arc

Abstract A dc arc plasma emission method is described for determining boron in plants at levels of ≧2.5 ≧g/g. The sample is wet-digested and analyzed at 2497.73A. Lithium is added to mask enhancement of emission by other alkali metals. Results for boron determined by the described method and atomic absorption spectrophotometry compared favorably. Recoveries of boron added to plants ranged from 90.4 to 104.4% with a mean recovery of 99.7%. The described method is convenient, rapid, and accurate for determining boron in plants.

Spectrographic Determination of Trace Elements in Ferrous Materials

1974 ◽  
Vol 28 (1) ◽  
pp. 14-23 ◽  
Author(s):  
B. Morello ◽  
P. De Gregorio ◽  
G. Savastano
Keyword(s):  
Trace Elements ◽  
Powdered Sample ◽  
Reverse Polarity ◽  
Spectrographic Determination ◽  
Direct Excitation ◽  
Cathodic Region ◽  
Precision And Accuracy ◽  
Dc Arc ◽  
Supporting Electrode

A method is described for the spectrographic determination of trace elements in ferrous materials. The powdered sample is first mixed with PTFE (polytetrafluoroethylene) and graphite in the ratio 100:10:25. This mixture is then submitted to direct excitation in a 10 A dc arc, utilizing a capped supporting electrode of the Scribner-Mullin type, with reverse polarity (sample: negative; counter electrode: positive), the spectrum being taken from the central-cathodic region of the arc. The method may be used to determine Al, As, B, Co, Cr, Cu, Mn, Mo, Nb, Ni, Pb, Sb, Sn, Ti, V, Zn, and Zr. The detection limits are indicated, as are data on the precision and accuracy obtainable.

scholarly journals XII. A new current weigher and a determination of the electromotive force of the normal Weston cadmium cell

1908 ◽  
Vol 207 (413-426) ◽  
pp. 463-544 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic System ◽  
Electric Circuit ◽  
Secular Variations ◽  
System Of Units ◽  
Electro Magnetic ◽  
The Magnetic Field ◽  
A Current ◽  
Mutual Action

A Current can be measured absolutely in the electro-magnetic system of units either by means of the action of the current on a magnet, or of the current on a current. The former method has the disadvantage that at least two independent measurements are necessary. For example, in using an electro-magnetic balance, the strength of the magnet acted on by the electric circuit has to be determined, as well as the force exerted on the magnet by the circuit. In galvanometers, either of the sine or tangent type, the magnetic field produced by the electric circuit is compared with the earth’s horizontal field, the strength of which is determined independently. Further, as the strength of artificial magnets cannot be regarded as truly constant, and the earth’s field is subject to diurnal and secular variations, this class of measurement is not ideal. In the electrodynamic class of measurement the mutual action between two or more coils carrying current takes the form of a torque, as in electrodynamometers, or a direct force, as in current weighers. In electrodynamometers the torque may be measured with a bifilar suspension, the torsion of a wire or spring, or by means of a gravity balance. Current weigher measurements are almost always made by direct comparison with gravity, which is believed to be constant, and is known to a higher degree of accuracy than the strengths of any magnet or magnetic field that has yet been measured.

Spectrographic Determination of Calcium in Latex of Natural Rubber (Hevea Brasiliensis)

1970 ◽  
Vol 24 (6) ◽  
pp. 583-587 ◽  
Author(s):  
S. K. Ng ◽  
R. C. H. Hsia ◽  
P. T. Lai
Keyword(s):  
Natural Rubber ◽  
Atomic Absorption ◽  
Hevea Brasiliensis ◽  
Internal Standard ◽  
Lithium Carbonate ◽  
Cathode Layer ◽  
Spectrographic Determination ◽  
Dc Arc

A cathode layer dc arc method of determining microgram amounts of calcium in latex of Hevea brasiliensis is described. Using lithium carbonate and lanthanum sulphate as buffers, a working curve covering 0.032% to 10.0% Ca in ash of latex can be constructed with palladium as internal standard. Phosphate and silica suppress Ca emission but silica has a considerably greater effect. Of the four matrices examined, the composition with 44.7% K2O, 22.3% P2O5, and 13.4% MgO, which is most representative of the composition of latex ash, gives reproducible Ca values and these are in closest agreement with those obtained by atomic absorption. The spectrographic technique may be extended to simultaneously determine trace amounts of Mn, Fe, Cu, and Si.

scholarly journals Total-Burn Spectrographic Determination of Silicon in Plutonium

1967 ◽  
Vol 21 (2) ◽  
pp. 86-88 ◽  
Author(s):  
Roy Ko
Keyword(s):  
Internal Standard ◽  
Germanium Dioxide ◽  
Plutonium Dioxide ◽  
Graphite Electrodes ◽  
Spectrographic Determination ◽  
Spectrographic Method ◽  
Trace Concentrations ◽  
Dc Arc ◽  
Ppm Level

A total-burn spectrographic method has been applied to the determination of trace concentrations of silicon in plutonium. The sample is oxidized to plutonium dioxide, mixed with a germanium dioxide—graphite mixture containing tin internal standard, packed into cupped graphite electrodes, and burned to completion in a high-amperage dc arc. Plutonium spectral interference is avoided by using the less sensitive Si 2506.90-Å line. The lower limit of the determination is 25 ppm of silicon in plutonium. The precision of the method is estimated to be ±8% (coefficient of variation) at the 270-ppm level and ±14% at 40 ppm.

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