Evaluation for Four Reagent Kits and Two Flame Photometers Used to Determine Sodium and Potassium in Serum

1972 ◽  
Vol 18 (2) ◽  
pp. 124-128 ◽  
Author(s):  
Edward K Kim ◽  
Leslie D Waddell ◽  
James E Logan
Keyword(s):  
Comparative Studies ◽  
Good Precision ◽  
Flame Photometer ◽  
Precision And Accuracy ◽  
Sodium And Potassium

Abstract The Stanbio and Medi-Chem sodium and potassium kits were evaluated and the results compared with those obtained with the Coleman Jr. Model 21, NIL 4-7000, and Technicon flame photometers. Day-to-day reproducibility studies and data based on comparative studies with sera from patients revealed that the Stanbio and Medi-Chem sodium kits and the Medi-Chem potassium kit give diagnostically unsatisfactory results. Results with the Stanbio potassium kit were reproducible, but further improvement is required, as indicated by nonspecificity in the analyses of patient sera. Instability of the Coleman Jr. flame photometer made it difficult to obtain acceptable data in these tests, particularly for sodium, while the NIL flame photometer had good precision and accuracy.

Sodium and Potassium in Foods and Waters. Determination by the Flame Photometer

1949 ◽  
Vol 25 (4) ◽  
pp. 304-314
Author(s):  
Charles E. Bills ◽  
Francis G. McDonald ◽  
William Niedermeier ◽  
Melvin C. Schwartz
Keyword(s):  
Flame Photometer ◽  
Sodium And Potassium

Comparison of Infra-Dry and AOAC Methods for Moisture in Food Products

1984 ◽  
Vol 47 (8) ◽  
pp. 611-614
Author(s):  
B. A. MINOR ◽  
K. A. SIMS ◽  
R. BASSETTE ◽  
D. Y. C. FUNG
Keyword(s):  
Wheat Flour ◽  
Food Products ◽  
Practical Significance ◽  
Good Precision ◽  
Average Percentage ◽  
Fresh Milk ◽  
Cooling Chamber ◽  
Precision And Accuracy ◽  
Potato Flakes ◽  
The Times

The Infra-Dry (IR) method was accurate, precise and faster than conventional (AOAC) procedures for moisture determinations in ten selected food products. The average percentage moisture by the IR method for 10 common food products and those by AOAC in parentheses are as follows: oatmeal 9.88 (9.87), cornmeal 10.86 (10.91), wheat flour 10.80 (10.80), grape nuts 4.73 (4.78), rice 12.39 (12.41), potato flakes 8.40 (8.36), bread crumbs 9.93 (9.99), noodles 9.58 (9.54), NFD milk 4.23 (4.24), and fresh milk 88.60 (88.71). The temperatures used for the IR method (135 to 155°C) were higher than those for the AOAC procedures (130°C for all products except NFD and fresh milk [100°C]); however, the times were considerably less (10 to 30 min) than for AOAC procedures (1 to 5 h). Standard deviations were generally <0.06%, except for cornmeal and noodles which were approximately 0.1%. Precisions were generally >97%. Upon removing the samples from the IR oven, results of good precision and accuracy were obtained by cooling the samples in a desiccator for 5 min or the built-in IR cooling chamber for 45 s. The recommended IR method uses a cooling chamber, is faster, and does not require a desiccator. Slightly lower precision and accuracy resulted when the entire IR oven was used. The best results were obtained using the back third of the oven. However, the slight difference in precision and accuracy is of little practical significance.

Collaborative Study of the Gas-Liquid Chromatographic Method for Determination of Stereochemical Composition of Amphetamine

1972 ◽  
Vol 55 (1) ◽  
pp. 146-148
Author(s):  
Clyde E Wells
Keyword(s):  
Column Chromatography ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Good Precision ◽  
Liquid Chromatographic Method ◽  
Precision And Accuracy ◽  
Standard Deviations ◽  
Liquid Chromatographic ◽  
Amphetamine Sulfate

Abstract Eight laboratories collaboratively studied a method for the quantitative GLC determination of d- and l-amphetamine in tablets. The drugs are separated from tablet excipients by column chromatography and reacted with Ntrifluoroacetyl-( 0-prolyl chloride, and the resulting derivatives are analyzed by GLC. The samples consisted of commercial d-amphetamine sulfate tablets (with and without butabarbital), dl-amphetamine sulfate tablets, and a mixed d- and l-amphetamine sulfate standard. Recoveries were acceptable, and the standard deviations never exceeded 0.64%. The results demonstrate that the method gives good precision and accuracy, and the method is recommended for adoption as official first action.

A Method for Measurement of Sodium and Potassium in Erythrocytes and Whole Blood

1969 ◽  
Vol 15 (8) ◽  
pp. 712-719 ◽  
Author(s):  
Helen I Bugyi ◽  
Eugene Magnier ◽  
William Joseph ◽  
Gordon Frank
Keyword(s):  
Clinical Significance ◽  
Whole Blood ◽  
Peripheral Blood ◽  
Red Cells ◽  
Disease States ◽  
Precision And Accuracy ◽  
Sodium And Potassium

Abstract The analysis of concentration of cations in erythrocytes and plasma, in theory, offers a means of identifying disease states in peripheral blood. Technical difficulties associated with cation analysis in erythrocytes and whole blood have resulted in a lack of precision and accuracy. This lack has increased the difficulties of using the analysis of blood in the diagnosis of disease. It is felt that the technic discussed in this paper with its increased precision, in combination with previously mentioned research in the diagnosis of disease, will increase the clinical significance of the analysis of red cells and whole blood for the diagnosis of disease states.

Electrical Modifications of the Baird Flame Photometer Which Simplify Calibration and Improve Accuracy of Low Potassium Readings

1959 ◽  
Vol 5 (5) ◽  
pp. 492-495
Author(s):  
Robert C MacDuffee
Keyword(s):  
Serum Sodium ◽  
Simple Circuit ◽  
Flame Photometer ◽  
Improve Accuracy ◽  
Low Potassium ◽  
Sodium And Potassium ◽  
Sample Dilution

Abstract Simple circuit modifications to the Baird flame photometer are described which increase ease of calibration and which enable serum sodium and potassium to be determined on the same sample dilution with no loss of precision.

Further Modification of Flame Photometer

1960 ◽  
Vol 6 (6) ◽  
pp. 598-606 ◽  
Author(s):  
Samuel Raymond
Keyword(s):  
Flame Photometer ◽  
Sodium And Potassium

Abstract Mechanical and electrical modifications of the Baird flame photometer are described that increase ease of setting, improve the precision of response, and permit both sodium and potassium to be determined without resetting zero or sensitivity controls.

Modified Flame Photometer for Microdetermination of Sodium and Potassium

1955 ◽  
Vol 27 (11) ◽  
pp. 1849-1850 ◽  
Author(s):  
A. K. Solomon ◽  
D. C. Caton
Keyword(s):  
Flame Photometer ◽  
Sodium And Potassium
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