Sodium solution

The first stage is to prepare the naphthyl sodium solution in the following way ... 

Pentanesulfonate sodium solution Add about 961 mg of sodium-1-pentanesul-fonate and 1 mL of glacial acetic acid to 400 mL of water, and mix. 

Mobile phase Prepare a filtered and degassed mixture of methanol and 1-penta-nesulfonate sodium solution (60 40). Make adjustments if necessary (see system suitability under Chromatography <621 >). 

A second type of interference is ionization interference. Certain elements, particularly the alkali metals in high temperature flames, become partially ionized in the flame. This event causes a decrease in the number of neutral atoms and hence, a decrease in the sensitivity. For example, an appreciable fraction of sodium atoms will be ionized. Now if another easily ionized element such as potassium is added to the sodium solution, it will contribute free electrons to the flame and cause the equilibrium for the sodium ionization to shift toward the formation of a larger fraction of neutral atoms. This is, therefore, a positive interference. It can be overcome by adding the same amount of interfering element to the standard solution. Or, more simply, a large amount of an ionizable element such as potassium (200 to 1000 ppm) can be added to both sample and standard solutions this will effectively suppress ionization to a small and constant value and at the same time increase the sensitivity. 

Prepare 100 mL of a 100 ppm sodium solution from the available 1000 ppm. Obtain soda pop samples and degas approximately 5 to 10 mL of each. 

Reizer, J., Reizer, A. and Saier Jr., M. (1994) A functional superfamily of sodium / solute symporters. Blochim BiophysActa 1197, 133-166. 

Accidental exposure Accidental skin and eye contact with foscarnet sodium solution may cause local irritation and burning sensation. Flush the exposed area with water. Other CMV infections Safety and efficacy have not been established for the treatment of other CMV infections (eg, pneumonitis, gastroenteritis) congenital or neonatal CMV disease nonimmunocompromised individuals. 

Fluorescein Sodium Solution for Injeotion Ophthalmological diagnostic agent... 

Bemiparin Sodium Solution For deep vein thrombosis... 

The oxidation of living polymers by oxygen was first reported by SZWARCS- who observed that the viscosity of the living mixture increased when the oxygen was passed through a polystyryl-sodium solution. 

Asker, A. F., and Larose, M. (1987), Influence of uric acid on photostability of sulfathia-zole sodium solutions, Drug Dev. Ind. Pharm., 13,2239. 

Mast cell stabilizers Intal (Aventis) Cromolyn sodium Solution for inhalation 20 mg/2 mL None... 

Equilibrium Vaporization. The cesium release results presented in this chapter may also be used to demonstrate our earlier conclusion that equilbirium vaporization represents the upper limit for the fractional fission-product release as a function of sodium vaporization. Figure 6 shows three cesium release curves. Curve A was calculated from the Rayleigh Equation in conjunction with the partial molar excess free energy of mixing of infinitely dilute cesium—sodium solutions reported... 

Bismuth-Sodium Solutions. G.P.Smith et al (Ref 4) detd the compn limits of reactions of air with solns of Na and Bi or Hg in the temp range 600-800°. For Na-Bi, the reaction was accompanied by flame or a weak expln at high temp and high Na concn. No reaction occurred at mole fraction of Na<0.45 Refs l)Kirk Othmer 2(1948),p 531 2)Partington(1950),p 873 3)Anon, Common Defense Bulletin No l43(Sept 1952),Washington,DC 4)G.P.Smith et al.JACS 77,4533 (1955 CA 49,15393(1955) 5)Cond Chem-Dict( 1961), 152-3... 

With decreasing concentration the atomic conductance of the sodium solution decreases to a minimum of 540 at 0.04iV. Beyond the minimum, the conductance increases with increasing dilution and approaches a limiting value of 1022. It is obvious that between the minimum and infinite dilution, phenomena are occurring which are very similar to what one finds in all electrolyte solutions. In short, the conductance varies much like that of an ordinary electrolyte in liquid ammonia and similar solvents. 

In one respect, the current passing through a solution of sodium in liquid ammonia is metallic in nature. The current passes from solution to metal and vice versa without any evidence of material effects at the electrodes. The process on electrolysis of a dilute sodium solution may be followed readily if the solutions used are sufficiently dilute so that the electrodes may be observed visually and the potential is sufficiently high to bring about concentration changes in a reasonable period of time. 

The fluidity of ammonia increases about 1.5% per degree, and in the dilute range the temperature coefficient of metal solutions is of this order of magnitude but from a concentration of approximately 0.9AT onward the temperature coefficient of sodium and potassium begins to increase, reaching a maximum of about 3.6% for sodium and 4.6% for potassium. The conductance increase owing to temperature increase can only be caused by an increased dissociation of sodium spinide. It follows that the conductance increase with increasing concentration of sodium solutions is to be expected and conforms with the assumptions of a micro Wien effect. 

All reactions were found to be first-order in the absorbance, and all reactions except that of sodium solutions with water seem to be first-order in water. In considering the apparent 3/2 order in water for the latter, it must be recalled that sodium solutions show only a single absorption band with a maximum at 660 m/z. The nature of this reaction is... 

Orberholtzer, E. R., Brenner, G. S. Cefoxitin sodium solution and solid-state chemical stability studies. J Pharm Sci 68 863-866 (1979). 

Morimoto, K., et al. 1991. Effects of viscous hyaluronate-sodium solutions on the nasal absorption of vasopressin and an analogue. Pharm Res 8 471. 

Cavatur and Suryanarayanan [1.164] have developed a low-temperature X-ray powder diffractometer (XRD) technique to study the solid states of solutes in frozen aqueous solutions. In frozen naftillin sodium solution (22% w/w), no eutectic crystallization was observed. Annealing at -4°C caused solute crystallization, which increased with annealing time. Two other products studied showed that XRD provides information about the degree of crystallinity without the interference of other events. 

A mixture of furfurylbenzyl ketone and of N-ethyl-a-benzylamine in methanol was hydrogenated over Raney nickel at 150°C and at a pressure of 1500 p.s.i. The catalyst was removed by filtration and the solvent removed by vacuum distillation. The oily residue was taken up in ether, the ether solution washed with dilute hydrochloric acid and the aqueous layer separated. Addition of 35% sodium solution caused the separation of an oil which was taken up in ether. Removal of the ether by evaporation followed by distillation of the residue gave N-ethyl-a-benzyltetrahydrofurfurylamine, boillin point 101°C/0.07 mm. 

Calcium crystallizes from sodium solution in flat platelets that have a beautiful, although irregular, dendritic structure. The particle size depends on the rate of cooling, but under ordinary circumstances varies between about 0.01 and 2.0 mm. The apparent density of the isolated powder is about 0.5. Its finely divided nature enhances its reactivity in most of the reactions wherein it is used. 

Finely divided calcium for laboratory purposes can also be prepared by recrystallizing bulk calcium from a sodium solution. The bulk calcium dissolves in sodium at elevated temperatures and, upon cooling, crystallizes out in small dendritic platelets that become trapped in a sodium matrix when the sodium solidifies. As in the previous synthesis, the sodium matrix may be removed by preferential reaction with a hydrous lower alcohol. 

Calcium, finely divided metal from a sodium solution, 6 24 metal powder from a sodium solution, 6 18... 

Sulfadiazine Sodium Solutions of sulfadiazine sodium are alkaline, and incompatibility may reasonably be expected with acidic drugs or preparations unstable at high pH. Sulfadiazine interacts with paraaminobenzoic acid derivatives. 

We obtained a measure of the degree of ionization as a function of the total sodium density in the flame by plotting the ratio of the ionization signal to sodium solution concentration versus the latter concentration on double logarithmic scales as shown in Fig. 3. For concentrations in excess of... 

Figure 3. Ratio of ionization signal to sodium solution concentration plotted...

---