NaCl purging solution

Potentiostatic tests " have been used and Wilde and Williams in potentiokinetic studies of the critical breakdown potential of stainless steels (Types 430 and 304) in 1 -0 mol dm" NaCl, showed that the nature of the gas used to purge the solution has a pronounced effect on the value of... 

Spectra were obtained using a Digilab FTS-15E Fourier Transform Spectrophotometer. A NaCl crystal mounted in a heated cell (Model 018-5322 Foxboro/Analabs, N. Haven, Ct.) was placed in the infrared beam and the chamber allowed to purge for several minutes while the cell was brought to the desired temperature. The temperature of the cell was controlled using a DuPont 900 Differential Thermal Analyzer interfaced to the spectrometer cell. A chlorobenzene solution (ca. 10 by wt.) of the sample was then applied to the crystal using cotton tipped wood splint. 

Dissolve a sulfhydryl-containing peptide hapten at a concentration of 25 pmol/ml in degassed, nitrogen-purged lOmM HEPES, 0.15M NaCl, pH 7.0. Add the peptide solution to the liposome suspension at a molar ratio necessary to obtain at least a 5 1 excess of thiol groups to the amount of maleimide groups present (as MPB-DPPE). 

The test specimens were suspended in five different test tanks. One tank had 1.0 N NaOH, two had 0.25N NaOH and two had 3.5% (by wt.) NaCl solution. One 0.25N NaOH and one 3.5% NaCl solution tank were purged of oxygen with a nitrogen atmosphere (oxygen concentration of less than 3%), the complimentary pair of tanks had natural air exposure (oxygen concentration 20%). A summary of the initial status of each tank is given in Table I. 

Fig. 3 Time profiles of the transient absorption of PTZ + monitored at 520 nm during the 355-nm laser flash photolysis of (a) DNA aO, a2 and a5 (X = Z), and (b) bO, b2, and b5 (X = D). The smoothed red curves superimposed on the experimental data are the single exponential fit from which the charge transfer rate through DNA (1/t) was determined. The sample aqueous solution contained 80 pM DNA and 100 mM NaCl in 10 mM Na phosphate buffer (pH 7.0) purged with Ar...

Many investigations, chiefly electrokinetic have been published on pH dependent surface charging of metal sulfides, and the redox conditions have been considered as a major variable in many papers. Dekkers and Schoonen [250] estimated dissolved oxygen concentration in water (nitrogen purged for 30 min) to be 0.25 mg dm. This water was used to prepare 10 -10 mol dm NaCl solutions in which synthetic greigite Fc3S4 and pyrrhotite Fei.xS were dispersed, and their lEP... 

The improvement in the CEC value for Cu after regeneration with NaCl solution is likely d e to the purging of deleterious ions from the natural zeolite by Na. Accordingly, the pressure pretreatment method described in the experimental methods section was used to place... 

The ability to model can be seen in Fig. 6.6.1 where comparisons are given between finite element calculations and experimental results for the electro-osmotic purging of a 100 mol m acetic acid solution initially saturating a kaolin clay sample. The distributions shown are after 0.12 of a pore volume of liquid is removed. The purge is a 100 mol m NaCl solution and the sample is compacted in an acrylic cylinder 0.5 m in length and 0.1 m in diameter with... 

Preparation of L3-Bisrdimethylhydrogensilylmethylene benzene. To a N2 purged round bottom flask in a cold bath at -40°C was added 100 mL of THF. To the THF was added 9.0 mL of chlorodimethylsilane (81 mmol). The dianion of m-xylene (20 mmol) was taken and the hexane layer was removed. To each centrifuge tube was added 20 mL of THF with shaking. After the anions were suspended in the THF, the contents of each one was slowly added to the round bottom flask. The reaction was allowed to proceed for 5 h after the final addition of the anion. After 5 h, the solution was washed with a saturated NaCl solution. To the organic layer which separated was added hexane or diethyl ether which forced out a second aqueous layer. The organic phase was dried over magnesium sulfate and... 

The sidestream of first effect, or flash effect, slurry that goes to sulfate removal is centrifuged and washed if necessary for the recovery of mother liquor. The liquor and wash solution drop to the slurry tank. The collected salt, which is 15-20% Na2S04, is purged. The amount of NaCl lost, in one particular design, was about 1 % of the quantity purchased. Section 9.4.2.1 describes more elaborate systems that remove sulfate more selectively. 

Freshly cut sodium (5-mm-edge cubic pieces, 3.31 g, 0.144 mmol), and anhydrous diethyl ether or THF (30 mL) are placed in a 100-mL round-bottom flask. The flask is cooled to 0°C, and purged with Ar. Then are added TMSCl (22.8 mL, 19.5 g, 180 mmol) and a solution of diethyl succinate 1 (5.22 g, 30 mmol) in 10 mL of the same solvent. The ultrasonic bath is cooled to 0-5°C, a temperature at which the reaction rate is optimal and the exothermicity best controlled. The reaction flask under Ar is immersed and the apparatus is switched on. Progress is monitored by GC or TLC. When diethyl succinate is totally consumed (ca. 2 h), the mixture is filtered through Celite . The solid (NaCl) is washed with anhydrous diethyl ether (3 x 30 mL). From the ethereal phases transferred to a distilling flask, the solvent is evaporated. The residue is distilled through a 25-cm vacuum-jacketed Vigreux column at 30-32°C under 0.02 torr to yield pure l,2-bis(trimethylsilyloxy)cyclobutene 2 (5.65 g, 82%) as a colorless liquid. 

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