Reduced specific retention volume

Data Treatment. Reduced specific retention volumes (Vg) were calculated from the expression (13)... 

Linear velocity of mobile phase Optimum linear velocity of mobile phase Practical linear velocity of mobile phase Reduced velocity of the mobile phase Specific retention volume... 

These net retention volumes are reduced to specific retention volumes, by division of equation (2) with the mass of the liquid (here the Uquid is the molten polymer). They are corrected for the pressure difference between column inlet and outlet pressure, and reduced to a temperature To = 273.15 K. 

The first method [92] consists of measxiring specific retention volumes of solute at two temperatures, the stationary phase being chosen so that it forms an athermal solution — 0). Eqn (4.29) particularized for enthalpies then reduces to ... 

Having chosen the test mixture and mobile diase composition, the chromatogram is run, usually at a fairly fast chart speed to reduce errors associated with the measurement of peak widths, etc.. Figure 4.10. The parameters calculated from the chromatogram are the retention volume and capacity factor of each component, the plate count for the unretained peak and at least one of the retained peaks, the peak asymmetry factor for each component, and the separation factor for at least one pair of solutes. The pressure drop for the column at the optimum test flow rate should also be noted. This data is then used to determine two types of performance criteria. These are kinetic parameters, which indicate how well the column is physically packed, and thermodynamic parameters, which indicate whether the column packing material meets the manufacturer s specifications. Examples of such thermodynamic parameters are whether the percentage oi bonded... 

Reduced parameters, 66-69 Refractive index (RI) detector, 206-207 Regular solution, 49 Relative retention, 20-21, 22, 77 Repeatability, see Precision Reproducibility, see Precision Resolution, 17-19, 55 Response factors (detector), 104, 125 Response time, 94 Retardation factor, Rf, 71 Retention index of Kovats, 78 Retention ratio, 11, 12, 71 Retention time, 6, 9 Retention volume, 9, 75 adjusted, 10, 75 corrected, 62-63, 75 net, 63, 75 specific, 110 Reverse phase LC, 158 Rohrschneider/McReynolds constants, 137-140... 

OTHER WATER-RETAINING STATES In patients with congestive heart failure, cirrhosis, or nephrotic syndrome, ejfective blood volume often is reduced, and hypovolemia frequently is exacerbated by the liberal use of diuretics. Since hypovolemia stimulates vasopressin release, patients may become hyponatremic owing to vasopressin-mediated retention of water. The development of potent orally active receptor antagonists and specific inhibitors of water chaimels in the collecting duct would provide an effective therapeutic strategy not only in patients with SIADH but also in the much more common setting of hyponatremia in patients with heart faftme, cirrhosis, or nephrotic syndrome. 

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