Rubidium concentrations in seawater from various locations and depths to 3,900 m have been determined using two independent techniques--direct flame photometry and mass spectrometry. Results of these two techniques agree within estimated errors and indicate that the rubidium content in the oceans is uniform within H$% with values varying about 120 pg/liter. Sediment from the sea floor below a d...

Hypokalemia has been associated with the taking of gossypol, a potential oral antifertility drug for men. Because the frequency of this response differed in different parts of the world, this study was done to learn if "normal" serum [K+] also differed. [K+] was measured by flame photometry in serum from apparently normal men from Austria (n = 30), China (53), Brazil (100), the Dominican Republ...

PROCEDURE for the determination of calcium in biologic material, one which would be adaptable to the rapid and accurate analysis of the many specimens encountered daily in the laboratory of a large general hospital, has been the objective of many recent studies. Our interest in this problem has led us to investigate the currently proposed methodology. The critera that we have set for the ideal ...

Potassium and sodium ion concentrations were estimated by the flame photometry and potentiometry in the vitreous fluid of isolated porcine eyeballs at time of death and of eyeballs, stored at temperature of 6-8 degrees C during post-mortem intervals: 4, 28, 52, 75, 100, 124 and 148 hours. The increase of K+ concentration and decrease of Na+ concentration were proportional to the increasing post...

EVER SINCE THE CLASSIC OXALATE METHOD of Kramer and Tisdall (1), for the determination of serum calcium, simpler methods have been sought to determine calcium. Among the more important methods suggested have been flame photometry, colorimetry, and titrimetry. Flame photometry of calcium in serum and urine has not as yet been satisfactorily developed. Serious and rather unpredictable interferenc...

This is a kinetic assay for measuring serum Na+ concentration based on determination of Na+-dependent beta-galactosidase (EC 3.2.1.23) activity. The method, sufficiently sensitive to measure sub-millimolar concentrations of Na+, was modified by including a Na+-binding agent (cryptand) to provide a linear assay for serum Na+ concentrations between 110 and 160 mmol/L. The assay was developed with...

a number of researches have been performed in the field of elemental analysis of fruitsfrom different areas of iran and there is a vast unstudied area in this field. in this study, seven mineral elements such as na, k, ca, mg, fe, zn and cu in the tree soil, citrus limunum juice of gorgan and iranshahr gardens and citrus limetta juice of gorgan and bandarabas gardens were determined by flame ph...

The involvement of elements in the pathological process of primary hypertension has been established. The serum levels of copper, iron, zinc, sodium, potassium and calcium were studied by atomic absorption spectrophotometery and flame photometry in hypertensive and normal subjects. Serum copper and zinc levels were increased in hypertensive patients (25.5% and 14.7% respectively) as compar...