Efficacy of Low Inductance AC Spark Technique for Aluminum Alloys

Rozsa, J. T.; Zeeb, L. E.

doi:10.1366/000370252774652415

Cited by 4 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Normal Values in Control Subjects. The mean, range, and standard deviation of normal values for erythrocyte calcium, magnesium, copper, and zinc in 27 healthy men and 30 healthy women who ranged in age from 16 to 75 years are shown in Table IV. There was no difference between the results in men and those in women and there was no relation between metal concentration and age of the subjects.…”

Section: Resultsmentioning

confidence: 99%

Determination of Calcium, Magnesium, Copper, and Zinc in Red Blood Cells by Emission Spectrometry.

Valberg¹,

Holt²,

Szivek³

1964

Anal. Chem.

View full text Add to dashboard Cite

b A method i s described for the determination of calcium, magnesium, zinc, and copper in red blood cells, the latter in a range of 0.1 to 3 pg. per gram.Blood collected carefully in plastic syringes fitted with stainless steel needles is centrifuged in the syringe to separate the blood cells.The red blood cells are ejected from the base of the syringe and ashed in platinum dishes at 450" C. The salts are converted to their chloride form and strontium i s added as the internal standard. The samples are applied to the surface of platform electrodes coated with plicene. The elements are determined by a direct reading emission spectrograph with a high voltage spark technique. The reproducibility o f the technique is of the order of 10%.Normal values for erythrocyte calcium, magnesium, zinc, and copper obtained with this technique are given and compared with values reported in the literature. HE GROWING INTEREST in the roleT of trace elements in metabolism and the production of disease requires methods for the measurement of metals at concentrations of a few parts per million that are both easy and precise. Emission spectrometry permits the simultaneous determination of many elements in tissues and the direct reading spectrograph shows promise of making this task less tedious and even more precise ( 7 ) . EXPERIMENTAL Instruments. A Jarrell Ash 3.4-meter Ebert mount spectrograph with direct reading attachment was used. Exit slits located on analytic lines for magnesium at 2852.1 A., copper a t 3247.5 A,, zinc at 3345.0 A., calcium at 4226.7 -4., and strontium at 4607.3 A,, were 86, 125, 88, 88, and 83.5 microns in width, respectively. Reagents and Chemicals.Ultrapure water was prepared from raw water by a system t h a t employed a still in combination with mixed-bed ion exchange resins ( 6 ) . The resistivity of the water was 10 X 106 ohms or greater. Hydrochloric acid was prepared from commercial anhydrous hydrogen chloride gas (81) and commercial sodium heparin was purified by extraction with dithizone (8). Spectrographically standardized pure salts obtained from Johnson and Matthey Co. Ltd., London, were used in the preparation of standard solutions.Cleaning of Apparatus. Glassware and polyethylene ware were cleaned in a dilute solution of detergent, placed in a 1 : 1 mixture of concentrated sulfuric acid and concentrated nitric acid for 8 to 12 hours and then rinsed thoroughly with ultra-pure water. Plastic syringes were dismantled, immersed for 24 hours in 1N sodium ethylene-diaminetetraacetate adjusted to p H 11 with sodium hydroxide and then rinsed thoroughly with ultra-pure water. Platinum crucibles were cleaned with sodium bisulfate and by immersion in boiling nitric acid (21).Preparation of Samples. With a 30-ml. plastic syringe (Stylex Syringe, J. F. Hartz Co., Toronto, Ont.) fitted with a stainless steel needle (Becton, Dickinson Co. Ltd., Toronto, Ont.) blood was taken from patients after an overnight fast. Purified heparin (0.1 mg.) was placed in each syringe before the blood was drawn to prevent coagul...

show abstract

Section: Resultsmentioning

confidence: 99%

Determination of Calcium, Magnesium, Copper, and Zinc in Red Blood Cells by Emission Spectrometry.

Valberg¹,

Holt²,

Szivek³

1964

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…A variable transformer provides a current of 10 amperes w'hen the electrodes are short circuited. Presumably, an interrupted direct current arc (9) or an overdamped condenser discharge (3) could have been used with equivalent success, had such units been available in this laboratory. The selection of the exposure period is based on a study of line intensity versus time relationships of the boron and iron lines.…”

Section: Excitationmentioning

confidence: 99%

“…THE lack of precise methods for determination of fluoride was strongly felt during an analytical investigation of fluorine compounds. An indirect spectrophotometric procedure, based on measuring the bleaching of the thorium-alizarin Red S complex (9), was originally used, but the repeatability turned out to be very low, only about 5%. This led to an investigation of the maximum attainable precision of indirect spectrophotometry.…”

Section: Precision and Accuracymentioning

confidence: 99%

Spectrographic Determination of Trace Quantities of Boron in Steel

Runge¹,

Brooks²,

Bryan³

1955

Anal. Chem.

View full text Add to dashboard Cite

“…As stated in the beginning, the primary purpose of this investigation wa-s to establish the practicality of working with the 2497.733-boron line. Since for some time analyses of 0.0006% boron and lower have been reported using a conventional prism spectrograph with alternating current arc or pulsating unidirectional arc excitation (18), it is therefore assumed, from consideration of the high degree to which the interference is resolved, that the use of these forms of excitation with echelle spectrographs should result in increased sensitivity.…”

Section: Spectrographmentioning

confidence: 99%