Of sodium tetraphenylboron

The capabihty of the developed theoretical model is illustrated in Fig. 3, where the comparison of experimental data [39] with theoretical prediction for ET rates in trans-l-(4-biphenylyl)-4-(2-naphthyl)cyclohexane (C-1,4) in tetrahydrofuran (THF) (e = 7.58) as function of sodium tetraphenylboron (TPB) concentration is presented. The calculations are performed with ion size Ri = 7.6 A which, according to the Ebeling expression for association constant, reproduced the experimental value of the dissociation constant of the considered electrolyte, L = 11.8 A. The sizes of donor and acceptor, according to [40] are / > = Ra = 5.9 A. As we can see from Fig. 3, the theory quite accurately reproduces the dramatic reduction of ET rates in the... 

STANDARD PARTIAL MOLAL HEAT CAPACITIES OF SODIUM TETRAPHENYLBORON AQUEOUS SOLUTION FROM 0 TO 90 DEGREES. EFFECT OF WATER STRUCTURE AND HYDROPHOBIC HYDRATION. 

Scheme 7.17 Rhodium-catalyzed addition of sodium tetraphenylboronate to ketones, as described by Satoh, Miura, and coworkers [29],...

O OIM Sodium tetraphenylboron Dissolve 3 42 g of sodium tetraphenylboron in 50 ml of water, add 0 5 g of aluminium hydroxide gel, B.P. and shake for twenty minutes. Dilute to 300 ml with water, add and dissolve 16 6 g of analytical reagent grade sodium chloride and allow to stand for thirty minutes. Filter clear (re-filter the first 20 to 30 ml of filtrate if cloudy), using suction, through two thicknesses of Whatman No. 42 filter paper, wash the filter with water and dilute the filtrate to 1 litre with water. Adjust the pH to between 8-0 and 9 0 with 0 1 N sodium hydroxide, using narrow range Universal pH papers. Store in an amber-coloured flask. 

Cesium isotopes can be recovered from fission products by digestion in nitric acid, and after filtration of waste the radioactive cesium phosphotungstate is precipitated using phosphotungstic acid. This technique can be used to prepare radioactive cesium metal or compounds. Various processes for removal of Cs isotopes from radioactive waste have been developed including solvent extraction using macrocycHc polyethers (62) or crown ethers (63) and coprecipitation with sodium tetraphenylboron (64). 

A manual titrimetric method using methyl orange as indicator and sodium tetraphenylboron as titrant has been described [273]. Dodecyl sulfate at concentrations of approximately 10"5 M have been analyzed by a visual two-phase titration in the presence of dichloroethane and tetrabromophenolphthalein ethyl ester [274]. 

With all batch techniques, there is the common problem of not removing the desorbed species. This can cause an inhibition of further adsorbate release (Sparks, 1985, 1987a), promote hysteretic reactions, and create secondary precipitation during dissolution of soil minerals (Chou and Wollast, 1984). However, one can use either exchange resins or sodium tetraphenylboron, which is quite specific for precipitating released potassium, as sinks for desorbed species and still employ a batch technique (Sparks, 1986). Also, since in most batch methods the reverse reactions are not controlled, problems are created in calculating rate coefficients. This is particularly true for heterogeneous systems such as soils. 

Reed, M. G., and Scott, A. D. (1962). Kinetics of potassium release from biotite and muscovite in sodium tetraphenylboron solution. Soil Sci. Soc. Am. Proc. 26, 437-440. 

Perchloric acid Dipicrylamine Sodium tetraphenylboron + acetic acid White precipitate of potassium perchlorate Orange-red complex precipitate (NH4+ interferes) sensitivity, 3 pg of K White precipitate of the potassium salt... 

Sodium tetraphenylboron test Potassium forms a white precipitate in neutral solutions or in the presence of acetic acid ... 

A few experiments were carried out with living polystyrene solutions containing sodium perchlorate or sodium tetraphenylboron (6). These salts had no effect on the rate of polymerization, although their concentration exceeded by... 

We are strictly content with studying quantitative determinations with tetraphenyl-boron ion (TPB) ( 6115)46 . Its sodium and lithium salts are soluble in water. Its rubidium, cesium, potassium, and ammonium salts are very poorly soluble. The solubility product of potassium tetraphenylboron is Als(K(C6H5)4B) = 2.25 x 10 . Likewise, numerous quaternary ammoniums and protonated amines form slightly soluble salts with tetraphenylboron ion according to the reaction... 

Dissolve an amount of powdered tablets equivalent to about one-quarter of a tablet in a mixture of equal volumes of acetate buffer solution, pH 3 7 (see p. 116) and water and dilute to 200 ml with the mixture in a graduated flask. Transfer a 10-ml aliquot of this solution to a dry beaker, add, with swirling, 15 ml of 0 01 M sodium tetraphenylboron, allow to stand for five minutes and filter through a dry, sintered-glass crucible. Pipette 20 ml of the filtrate into a flask, add 0 50 ml of bromo-phenol blue indicator and titrate the excess sodium tetraphenylboron with 0 005M cetylpyridinium chloride to the blue end-point. Repeat the operation omitting the sample. 1 ml O OIM sodium tetraphenylboron = 0 0003910 g potassium. 

Pipette 10 ml of a sample solution (prepared as described under the individual preparation) into a clean, dry beaker and continue as described above beginning with the words add 15 ml of 0 01 M sodium tetraphenylboron,. . and ending with the words. to a blue end-point. Let the ml required be Ta . Each ml of the difference (J5 - 5/4 Te) is equivalent to g of the substance being determined, where y is the equivalent weight for 1 ml of O OIM cetylpyridinium chloride. 

As indicated above the tetraphenylboron method is applicable to this preparation, provided the excess of reagent is controlled. If to 3 ml of sample exactly 7 ml of buffer solution, pH 3 7, is added, followed by 15 ml of 0 01 M sodium tetraphenylboron and the method given under Atropine, p. 116, is continued, good results will be obtained. Each ml of cetylpyridinium chloride is equivalent to 0 001504 g. 

Weigh 5 g of sample into a separator, add 5 ml of ether and extract, first with 5 ml of 2N acetic acid and then with three 5-ml quantities of buffer solution, pH 3 7. Filter each extract through the same cottonwool plug into a 20-ml graduated flask, warm to remove traces of ether, cool, and dilute to volume with buffer solution. Transfer a 10-ml aliquot to a clean, dry beaker and proceed as described on p. 116 beginning with the words add 15 ml of O OIM sodium tetraphenylboron. . ... 

Dissolve 0-3 g in about 75 ml of water in a separator and add 0-4 ml of bromophenol blue test solution (0-1 g of bromophenol blue dissolved in 3 ml of 0 05N sodium hydroxide and diluted to 200 ml with water), 10 ml of chloroform and 1 ml of N sodium hydroxide. Titrate with 0-02M sodium tetraphenylboron to the disappearance of the blue colour from the chloroform layer, adding the titrant dropwise towards the end of the titration and shaking vigorously after each addition. 1 ml 0 02M = 0-008962 g C27H42O2NCI. 

J. B. Xiao, J.W Chen, R L. Ren, Y. Y. Chen, and M. Xu, Highly sensitive detection of trace potassium ion in serum using resonance light scattering technique with sodium tetraphenylboron, to appear in Microchimica Acta. 

Cross, J. T., Identification and determination of cationic surface-active agents with sodium tetraphenylboron, 4na/y.v/, 1965,90, 315—324. 

The release of K and NH4 from a contracted lattice has been studied. Allison et al. [1953] have shown that NH4 is not released from a macroscopic NH4-vermiculite by treatment with K, but is slowly released by Na or Ca ions, i.e., ions that expand the lattice. DeMumbrum [1959, 1963] has studied the release of K from micas by sodium tetraphenylboron with the production of Na-vermiculite. 

De Mumbrum [1959] has produced a mica-vermiculite conversion by removal of potassium using sodium tetraphenylboron or sodium cobaltinitrite. In the process of conversion, the substance passes through an interstratified stage giving a 12 A reflection. De Mumbrum has also succeeded in partially removing Mg(OH)2 from chlorites by the use of sodium versenate. 

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