Multiple-choice question--The indicators for measuring the column efficiency of a chromatography column are ( )

3. The parameter used to measure the column efficiency of a chromatography column is (AC). A. Plate height B. Resolution C. Number of plates D. Distribution coefficient

Different substances in AC have different distribution coefficients on the same chromatography column; the effective number of theoretical plates and the effective plate height are used as indicators to measure column efficiency

A. Plate height and C. Number of plates

I chose AbCd; it should be more comprehensive

3. The parameter used to measure the column efficiency of a chromatography column is (A C). A. Plate height B. Resolution C. Number of plates D. Distribution coefficient

3. The parameter used to measure the column efficiency of a chromatography column is (AC). A. Plate height B. Resolution C. Number of plates D. Distribution coefficient

3. The parameter used to measure the column efficiency of a chromatography column is (AC). A. Plate height B. Resolution C. Number of plates D. Distribution coefficient. B represents the selectivity of the chromatography column; D refers to the ratio of the concentrations of the solute in the two phases when equilibrium is reached in that solid-liquid system. The distribution coefficient reflects the migration ability of the solute between the two phases as well as the separation efficiency, and it is an important physicochemical parameter for describing the behavior of a substance in two phases. 　　The distribution coefficient is related to the thermodynamic properties of the components, the mobile phase, and the stationary phase, as well as to temperature and pressure. In different chromatographic separation mechanisms, K has different meanings: in adsorption chromatography it refers to the adsorption coefficient, in ion exchange chromatography it is the selectivity coefficient (or exchange coefficient), and in gel chromatography it is the penetration parameter. But in general, it can be expressed by the distribution coefficient. 　　When the conditions (mobile phase, stationary phase, temperature, pressure, etc.) are constant and the sample concentration is very low (Cs and Cm are small), K depends only on the properties of the components and is independent of concentration. These are only the chromatographic conditions under ideal circumstances; under such conditions, the resulting chromatographic peaks are normal peaks ； In many cases, as the concentration increases, K decreases, and the chromatographic peak becomes a tailing peak ； And sometimes, as the solute concentration increases, K also increases, in which case the chromatographic peak becomes forward-shifted. Therefore, only by minimizing the injection volume to reduce the concentration of the components in the column can normal peaks be obtained when K remains constant. 　　Under the same chromatographic conditions, the components with a high K value in the sample remain in the stationary phase for a longer time and emerge from the chromatography column later ； Components with a low K value have a shorter retention time and flow out of the chromatographic column first. The greater the difference in distribution coefficients among the components in a mixture, the easier it is to separate them; therefore, different distribution coefficients for the various components in a mixture is a prerequisite for chromatographic separation. 　　In HPLC, once the stationary phase is determined, K is primarily influenced by the properties of the mobile phase. In practice, the composition of the mobile phase and its pH value are adjusted primarily in order to achieve differences in the distribution coefficients among the components as well as appropriate retention times, thereby achieving separation.

That’s what it says in the a+c textbook

3. The parameter used to measure the column efficiency of a chromatography column is (A C). A. Plate height B. Resolution C. Number of plates D. Distribution coefficient

The parameters used to measure the column efficiency of a chromatography column are (A, C). A. Plate height B. Resolution C. Number of plates D. Distribution coefficient

Agreed. The separation efficiency of a chromatography column during chromatographic separation is primarily determined by the kinetic factors (operational parameters). It is usually determined by the number of theoretical plates, the height of a theoretical plate, or the effective number of plates

A. Plate height and C. Number of plates

3. The parameter used to measure the column efficiency of a chromatography column is (AC). A. Plate height C. Number of plates

3. The parameter used to measure the column efficiency of a chromatography column is (ac). A. Plate height B. Resolution C. Number of plates D. Distribution coefficient. BD are clearly incorrect