specific retention volume

specific retention volume

[spə′sif·ik ri′ten·chən ‚väl·yəm]
(analytical chemistry)
The relationship among retention volume, void volume, and adsorbent weight, used to standardize gas chromatography adsorbents by the elution of a standard solute by a standard eluent from the adsorbent under test.
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The specific retention volume, Vg0, glass transition temperature, Tg; adsorption enthalpy, IHa; the sorption enthalpy, IH1S; sorption free energy, IG1S; sorption entropy, IS1S; the weight fraction activity coefficients of solute probes at infinite dilution, a|1a, partial molar enthalpy of solute probes at infinite dilution, IH1a; and Flory-Huggins interaction parameters, I12a; between polymer and solvents were determined in the temperature range of 493-343 K for poly(ABM) and 473-343 K for poly(ABM%41-coAN)-poly(ABM%71-coAN).
where Vg0 is the specific retention volume of the probe, T is the column temperature (K), M1 is the molecular weight of the probe and R is the gas constant.
Specific retention volume data are essential in the determining the physicochemical or thermodynamic properties of a polymer by IGC.
On one hand, the specific retention volume, [V.sup.[omicron].sub.g,1], (corrected to the reference temperature of 273.15 K) can be calculated according to Eq.
The mass mass-based infinite dilution activity coefficient of the solvent can be expressed in terms of the retention volume ([V.sub.g,1]) or the specific retention volume ([V.sup.[omicron].sub.g,1]).
A number of the original terms were found to he misleading or superfluous, including such terms as corrected retention time, net retention time, total retention volume (time), specific retention volume at 0[degrees]C, relative pressure; and their usage is strongly discouraged.
Specific retention volume, (V0 ), is the key term for calculating thermodynamic parameters in IGC and these values are obtained directly from chromatographic parameters.
Depending on specific retention volumes, V 0, of probes the w ht activity coefficients of solute probes at infinite dilution, 1[?], and Flory-Huggins interaction parameters, , between PCPhDMA-co-St and PCPhDMA-co-AN-solvents were investigated in the range of 413-453 K and 403-453 K, respectively.
The specific retention volume ([V.sub.g]) is defined as the volume of carrier gas required to elute the probe molecules adsorbed by 1 g of packing material under normalized pressure and temperature conditions (13, 14):
Distinguishing these mechanisms involves an analysis of the dependency of the specific retention volume ([V.sub.g]) on the carrier gas flow rate ([Q.sup.*]) and temperature.
Depending on specific retention volumes, Vg0, of probes the weight activity coefficients of solute probes at infinite dilution, O1[?], and Flory-Huggins interaction parameters, , between PCPhDMA-co-St and PCPhDMA-co-AN-solvents were investigated in the range of 413-453 K and 403-453 K, respectively.
The specific retention volumes, V 0 were calculated according to Equation (1) and the values of PCPhDMA-co-St and PCPhDMA-co-AN-probes are given in Table 2 and 3, respectively.