Trennzahl

An alternative measure of column performance is the separation number (SN), also known as the Trennzahl (TZ). It is defined as the number of coa nent peaks that can be placed between the peaks of two consecutive homologous standards with z and z+l Carlson atoms and separated with a resolution of R, 1.177 (almost baseline resolved, see section 1.6). 

A similar concept was suggested by Kaiser,23 who calls his parameter a separation number (SN), or Trennzahl (TZ) in German. It is the number of analytes that can be resolved between two consecutive members of the paraffin homologous series x and x + 1. It can be calculated by Eq. (27). 

Thermodynamics of zone migration, 54 Time constant (detector), 94 Trennzahl number, 18 Trouton s rule, 78, 148 Tswett, 1... 

The chromatogram that gives the Kovats relationship for a given stationary phase, can also serve to evaluate the performances of a column. For this, the separation number also known as the trennzahl number (TZ) is calculated from expressions 2.5 or 2.6. The two retention times occurring in these relationships relate to two successive alkanes differing by one carbon number (n and n + I atoms) or to two compounds of a similar type. The separation number indicates how many compounds could be baseline separated reasonably well by the column in the interval of retention time of these two reference compounds. The alkanes... 

Net retention time Replaced by Retention time Corrected retention time Temperature Trennzahl number (SN)... 

Mobile phase linear velocity. Table 3 Trennzahl Number (TZ) Comparison for Fast Pressure Ramps ... 

In gas chromatography a common measure for characterizing the quality of a capillary is the separation number, SN (also called Trennzahl, TZ). This gives the number of peaks that can be placed with resolution R = 1.18 between two members n and - -1 of a series of homologs ... 

The N calculation above cannot be used for temperature programmed conditions. It is only relevant to isothermal operation. For temperature program analysis, it is more relevant to describe the quality of the chromatography column by resolution or Trennzahl (Tz). The latter is related to the separation number SN, which is calculated for the separation of successive pairs of a homologous series, such as... 

Separation is also characterized by separation number (S/y) or Trennzahl (TZ). The latter is defined as the maximum number of peaks of equal heights one can place between the peaks of two reference compounds assuming a resolution of 1.0 between each of these peaks [77]. 

Trennzahl Number Tz. This term is comparable with separation number and is calculated from the resolution between two consecutive members of a homologous hydrocarbon series. It is usually considered as the number of peaks that could be placed between those two members of the series. It is used predominantly in capillary colunm work and is expressed as... 

We also can calculate a separation number SN or Trennzahl abbreviated as TZ as another way of describing column efficiency (41). By separation number we mean the number of possible peaks that appear between two n-paraffin peaks with consecutive carbon numbers. It may be calculated by... 

These mathematical models enable prediction of isothermal or temperature-programmed retention times with very good accuracy, and so chromatographers can estimate the effects of changing conditions on peak elution sufficiently well to provide a good basis for optimization. These models do not take into account any of the band-broadening processes that determine peak shapes, and therefore alone they cannot predict peak resolution, Trennzahl or separation number, or any other measurement of chromatographic quality. 

The Trennzahl number is, like the resolution, a means of assessing the efficiency of a column and is also used for temperature-programmed work. TZ gives the number of components which can be resolved between two homologous w-alkanes. 

Separation number or Trennzahl (TZ). A measurement of the number of peaks that could be placed with baseline resolution between two sequential peaks, z and z+ 1, in a homologous series such as two hydrocarbons ... 

Trennzahl separation number (TZ) Estimates how many paeks (of similar width) wUl fit between two other peaks of an homologous series ... 

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