NaNOa solutions, concentrated

Activity coefficients for Bk(iii) in aqueous NaNOa solutions have been calculated from distribution data for the ion between the aqueous phase and a tertiary alkylamine organic phase [189]. The activity coefficient values were reported as a function of the NaNOa concentration. 

H4] for an aqueous solution of the feed of concentration 3.5 Afin NaNOa and 3.0 in HNO3, in contact with 60 percent TBP in kerosene. Distribution coefficients will be higher at the bottom of the cascade, where the aqueous zirconium concentration is lower this will be neglected in the present treatment, but will be taken into account in Sec. 6.6. 

The method fails with heteropoly salts whose aqueous solutions exhibit a strong acid reaction. Additional complications arise if salt impurities (NaCl, NaNOa, etc.) are present in the solution, since these salts produce HCl, HNOa, etc., during passage through the column. A too strongly acid medium hinders the formation of free, crystalline heteropolyacids during concentration of the eluate. 

Electrolyte can normally be classified into three categories based on its pH value such as acidic, neutral, and alkaline. pH is the negative logarithm of hydrogen ions concentration in the solution. If the electrolyte solution has a pH value less than 7 then the solution is acidic. If the electrolyte solution has pH value equal to 7 then it is neutral solution. If the pH value exceeds 7 then the electrolyte solution is alkaline. Neutral electrolytes such as NaCl, NaNOa are commonly used in EMM. However, for microhole drilling acidic electrolytes are preferred. 

Figure 3. Sorption of Co(II) by Y-AI2O3 Percent uptake from aqueous solution as a function of pH, zCo, NaNOs background electrolyte concentration (38). Notice the lack of NaNOa concentration dependence.

Miscible displacement experiments were conducted on repacked sediments to determine relevant transport parameters (retardation coefficients) for U(VI) and SrEDTA in the absence of the effects of sedimentary stmcture and unsaturated flow. The erq)eriments were conducted in a glass column 1 cm in diameter and 4.5 cm in lengtii (U(VI)) or 10 cm in length (SrEDTA ). The influent solutions consisted of NaNOa or NaCl matrix, nomeactive Br tracer (2x 10 M), and the highest concentration of U and Sr utilized in the equilibrium batch e qteriments. A medical punq> was used to deliver solution to the bottom of the column at an average pore water velocity of 2.1 cm hr for... 

The flrst series of experiments utilized a square pitch lattice immersed in a sodium nitrate solution (NaNOa + HjO). The parametric variations in this series virere lattice pitch, NaNO concentration, md the total number of rods in... 

Fig. 7. Melting behavior of DNA in the absence (A) and in the presence (B) of zinc(II). ( ) first heating, (A), cooling, and (O) second heating. Solutions contained 5 x 10" M DNA (measured as phosphate concentration) and 5 x 10" M NaNOa. (From Ref. 25.)...

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