Analysis calcium

Carr, M.H. and Frank, H.A. "Calcium Analysis In Patients Being Treated With EDTA". Clin. Chem. (1957), 3, 20-21. 

Calcium aluminate chloride, phase in Portland cement clinker, 5 472t Calcium aluminate fluoride, phase in Portland cement clinker, 5 472t Calcium aluminoferrite, phase in Portland cement clinker, 5 472t Calcium aluminoferrite hydrate, 5 477t Calcium—aluminum alloys, 4 530 Calcium amalgam, 22 773 Calcium ammonium nitrate, 2 724 Calcium analysis, of water, 26 37 Calcium A zeolite, separation of hydrocarbons by, 16 823 Calcium—barium—silicon alloy, 22 519 Calcium-bearing manganese silicon,... 

Atomic Absorption Spectroscopy. A titanium punch was used to cut 2.8-mm-diameter samples from the papers for calcium analysis. A Perkin-Elmer Model AD-2 Electronic Ultramicrobalance was used for the accurate weighing of the paper samples. Calcium content in the Dl-Ca waters and the papers was determined using a Varian Techtron AA-6 Spectrophotometer, with a Model 90 Carbon Rod Atomizer and Potentiometer A-25 Recorder (3). The solid samples (paper samples) were introduced into the graphite cup atomizer with tweezers. The standard solutions and Dl-Ca waters were inserted into the cup atomizer by means of 5-/xL Oxford pipet. 

The total zinc content was determined by atomic absorption spectrophotometry (Perkin Elmer Model 360), after dry-ashing at 500°C. The calcium analysis was also done by atomic absorption spectrophotometry, but after wet-ashing in sulphuric acid and hydrogen peroxide. 

Thermal ionization has been used to determine isotopic abundance of virtually all the elements We have recently extnded our own capability in this direction by adapting the silica gel/phosphoric acid filament coating technique (5) to our system Five 1 of a fine silica gel suspension is placed on a filament Five l of the analyte ion solution is coated, dried then coated with 2 pi of a 0 7N phosphoric acid solution and heated until dry again The analysis is performed in a similar manner as before, except that the signal is more transient and somewhat less intense than the calcium analysis With this approach, however, we have made natural abundance isotope ratio measurements on zinc, copper, and magnesium Table II shows our measurements compared to the accepted values, shown in parenthesis, for these elements The isotope used as reference... 

ElOl Analysis of Urine Calcium. Supplement to the Test Methodology for Calcium Analysis (1983). 

Boukaii, L Shier, N.W. Fernandez R.X.E. Frisch, J. Watkins, B.A. Pawloski, L. Fly, A.D. Calcium analysis of selected western African foods. Journal of Food Composition and Analysis. 2001, 14, 37-42. 

A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data meq Ca/L = 3.15, 3.25, 3.26. What is the 95% confidence limit for the mean of the data, assuming... 

The system associates a quality variable q x with each parameter, x, of the analysis. Each quality variable is assigned an initial value of zero. When there is evidence to support or contradict the reliability of the parameter value, the quality variable is incremented or decremented. Consider the calcium concentration in an analysis. Initially its quality variable, q calcium, is set to zero. Assume that the carbonate species concentrations have been shown to be reliable but that the geochemical model shows calcite to be oversaturated by several tenths of a unit. The sample is of a limestone ground water, and so should be calcite saturated. Assuming that the program and thermochemical data used are correct, the calcite oversaturation can be interpreted as indicating an erroneous calcium analysis. q calcium is therefore decremented because of this evidence that the calcium value is incorrect. The overall quality... 

Calcium Analysis. Materials for calcium analysis were ashed in an electric muffle furnace at 600°C. for 2 hours. The ash after weighing was dissolved in 4N nitric acid and the calcium content of the solution was determined by atomic absorption spectroscopy using standard methods. 

Dolomite is a carbonate of magnesium and calcium. Analysis shows that 7.81 g of dolomite contains 1.70 g of Ca. Calculate the mass percent of Ca in dolomite. On the basis of the mass percent of Ca, and neglecting all other factors, which is the richer source of Ca, dolomite or fluorite (see Problem 2.11) ... 

Calcium analysis via ion-selective electrode has now become an inexpensive and dependable method for determining the free, ionized form of this element in blood and sera. A substantial portion of this technology has been due to an electrode which analyzes ionic calcium in blood (500 /iL sample) in 3 minutes with a standard deviation of 2%. ... 

Problems of pH in gastric juice may be overcome by bringing the samples to pH 6.2—7.2 with sodium hydroxide prior to ionised calcium analysis. In this way, calcium ion-selective electrode studies [248] have shown that the appearance of calcium in gastric juice involves both secretory and non-parietal components. A four-component model was developed to account for the observed calcium... 

An interesting kinetic study deals with the solution-mediated phase transformation of COT and COD into the thermodynamically stable COM [50]. The experimental conditions were adjusted so that either COT or mixtures of COD and COM crystallized initially as confirmed by X-ray diffraction powder patterns. The systems were then aged in contact with the mother liquid, and the transformation of COT or COD into COM was followed by monitoring the total crystal volume as a function of time (by Coulter counter) and determining (by thermo-gravimetric analysis) the relative proportion of the crystal hydrates at fixed time intervals. In addition, supersaturation profiles (i.e., activity products) were determined by solution calcium analysis. In all cases the transformation was completed within approximately 80-100 h. 

The effect of calcium ions is dramatic, the intensity of the resting photoprotein being increased by 6 orders of magnitude. Thus microanalysis of calcium ions is possible with aequorin down to intracellular calcium ion concentrations. Antagonists are ions, and to a lesser extent and ions. Lanthanide ions were found to be still more efficient than calcium ions [65]. Although in vitro calcium analysis can be achieved with highly sensitive - selective microelec-... 

---