Errors in Use of Model 18 Perkin-Elmer Flame Photometer for Determination of Alkali Metals

Parks, T. D.; Johnson, H. O.; Lykken, Louis

doi:10.1021/ac60021a010

Cited by 60 publications

(23 citation statements)

References 5 publications

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“…Resin separation of ions was found to be essential because of spectral interference of P and Ca in determination of Na, an effect noted also by others (17)(18)(19) Aliquots of fat-free powder were analyzed for chloride in duplicate according to Cheek and West (20), for carbonate in triplicate according to Bergstrom (21), and for total nitrogen in duplicate by the micro-Kjeldahl method.…”

Section: Methodsmentioning

confidence: 92%

The Mineral Content of Normal Human Bone1

Agna¹,

Knowles²,

Alverson³

1958

J. Clin. Invest.

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Evidence has been forthcoming from animal experimentation that the skeleton may gain or lose electrolytes under conditions of abnormal electrolyte metabolism (1). A complete evaluation of the significance of these findings in man depends upon knowledge of the composition of normal human bone. However, information regarding human bone is sparse. In 1894, Gabriel, in a very detailed study of animal bone, included two representative samples from an unstated number of specimens of humerus of man (2). Klement, in 1936, also conducted a comprehensive investigation of mineral content, but his material was limited to three samples of skull, and two each of pelvis and femur (3). In recent years, further reports of human bone composition have appeared (4-12). However, these latter observations have not been wholly satisfactory, in that the number of samples analyzed were few and the determinations were limited to two or three minerals. Furthermore, a majority of the subjects in these reports from whom bone specimens were obtained either died with disease, or specific statements concerning the condition of the subjects prior to death were not given. The largest study currently reported is that given in abstract form by Pellegrino and Farber (13). These workers analyzed tibial bone of 15 normal subjects for Ca, P, Na and K.The present study is concerned with the composition of bone obtained at autopsy from 16 normal adults who died suddenly. A comparative analysis of skull, rib and ilium, for water, calcium, phosphorus, carbonate, nitrogen, chloride, potassium and sodium is given.

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Section: Methodsmentioning

confidence: 92%

The Mineral Content of Normal Human Bone1

Agna¹,

Knowles²,

Alverson³

1958

J. Clin. Invest.

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“…It is a matter of common knowledge that the spectral emission of an element may be affected by the presence of other clements in the solution, as also by acidity, viscosity, etc. [4,10]. Thus a spectrographi c interference with the measured intensity of th e lines of sodium and potassium may be caused by calcium, which has a strong line (5857.46 A) close to the double sodium line (5895.92-5889.95 A) and a weaker line (7610.0 A) close to the potassium lines (7698.98 and 7664 .91 A ).…”

Section: Development Of the Methods 1 Standard Solutionsmentioning

confidence: 99%

“…In a study with this instrument, Parks, Johnson, and Lykken [10] noted a number of sources of error du e both to characteristics of the apparatus and to the presence of interfering elem ents. Berry, Chappell, and Barnes [4] furth er improved the Dame photometer by employing a dual optical sys tem that allowed both t]l e direct-intensity m ethod, and the internal- Flame Photometry for Portland Cement standard principle, often used in spectrographic determinations, to be used .…”

Section: Introductionmentioning

confidence: 99%

Studies on the flame photometer for the determination of Na2O and K2O in portland cement

Eubank¹,

Bogue²

1949

J. RES. NATL. BUR. STAN.

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A study has been made on the P erkin-Elmer model 52-A flame photometer to establish its suitability for t he determination of Na20 and K 20 in portland cements and cement raw materials, such as argillaceous limestones and clays. An essential factor in the successful appli cation of the method is t he use of suitable standard solutions for each type of material analyzed. Such so lutions were de veloped and excellent res ul ts obtained. This paper gives the photometric res ul ts due to numerous variables and presents a recommended procedure. On cements, t he averages of t he differences betwee n the direct-intensity photometric and the grav imetric values obtained wer e 0.012 p er cent for Na20 and 0.024 percent for K , O. Sligh t ly closer agreement was obtain ed with the internal-standard method, but un certa in t ies due to the possible presence of Li20 give greater re li abili ty to t he direct-in te nsity me thod. The advantages of flam e photometr y , both in time and accuracy, are such as to warrant its recommendation for t he purpose examined.

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“…To measure small variations in concentration by means of this phenomenon it is necessary to measure the radiant energy intensity wdth a photometer or spectrophotometer (6).…”

Section: Literature Citedmentioning

confidence: 99%