U.S. PHARMACOPEIA

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GLOSSARY OF SYMBOLS
To promote uniformity of interpretation, the following symbols and definitions are employed where applicable in presenting formulas in the individual monographs. [NOTE—Where the terms W and t both appear in the same equation they must be expressed in the same units.]
relative retention,
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cR, cI, cU concentrations of Reference Standard, internal standard, and analyte in a particular solution.
CA concentration ratio of analyte and internal standard in test solution or Assay preparation,
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CS concentration ratio of Reference Standard and internal standard in Standard solution,
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f distance from the peak maximum to the leading edge of the peak, the distance being measured at a point 5% of the peak height from the baseline.
k¢ capacity factor,
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N number of theoretical plates in a chromatographic column,
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qR, qI, qU total quantities (weights) of Reference
Standard, internal standard, and analyte in
a particular solution.
QA quantity ratio of analyte and internal standard in test solution or Assay preparation,
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QS quantity ratio of Reference Standard and
internal standard in Standard solution,
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rS peak response of the Reference Standard obtained from a chromatogram.
rU peak response of the analyte obtained from a chromatogram.
R resolution between two chromatographic peaks,
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RF chromatographic retardation factor equal to the ratio of the distance from the origin to the center of a zone divided by the distance from the origin to the solvent front.
RR relative retention
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RR relative retention time
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RS peak response ratio for Standard preparation containing Reference Standard and internal standard,
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RU peak response ratio for Assay preparation containing the analyte and internal standard,
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SR (%) relative standard deviation in percentage,
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where Xi is an individual measurement in a set of N measurements and X is the arithmetic mean of the set.
T tailing factor,
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t retention time measured from time of injection to time of elution of peak maximum.
ta retention time of nonretarded component, air with thermal conductivity detection.
W width of peak measured by extrapolating the relatively straight sides to the baseline.
Wh/2 width of peak at half height.
W0.05 width of peak at 5% height.