Preferred Label : plate number;
Detailed label : plate number in chromatography, N;
IUPAC definition : A number indicative of column performance, calculated from the following equations
which depend on the selection of the peak width expression: \[N (\frac{V_{{R}}}{σ
}) {2} (\frac{t_{{R}}}{σ }) {2}\] \[N 16\ (\frac{V_{{R}}}{w_{{b}}}) {2} 16\ (\frac{t_{{R}}}{w_{{b}}})
{2}\] \[N 5.545\ (\frac{V_{{R}}}{w_{{h}}}) {2} 5.545\ (\frac{t_{{R}}}{w_{{h}}}) {2}\]
The value of 5.545 stands for 8ln2. These expressions assume a Gaussian (symmetrical)
peak. In these expressions the units for the quantities inside the brackets must be
consistent so that their ratio is dimensionless: i.e. if the numerator is a volume,
then peak width must also be expressed in terms of volume. In former nomenclature
the expressions 'number of theoretical plates' or 'theoretical plate number' were
used for the same term. For simplification, the present name is suggested.;
Origin ID : P04694;
See also
A number indicative of column performance, calculated from the following equations
which depend on the selection of the peak width expression: \[N (\frac{V_{{R}}}{σ
}) {2} (\frac{t_{{R}}}{σ }) {2}\] \[N 16\ (\frac{V_{{R}}}{w_{{b}}}) {2} 16\ (\frac{t_{{R}}}{w_{{b}}})
{2}\] \[N 5.545\ (\frac{V_{{R}}}{w_{{h}}}) {2} 5.545\ (\frac{t_{{R}}}{w_{{h}}}) {2}\]
The value of 5.545 stands for 8ln2. These expressions assume a Gaussian (symmetrical)
peak. In these expressions the units for the quantities inside the brackets must be
consistent so that their ratio is dimensionless: i.e. if the numerator is a volume,
then peak width must also be expressed in terms of volume. In former nomenclature
the expressions 'number of theoretical plates' or 'theoretical plate number' were
used for the same term. For simplification, the present name is suggested.
