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 Wand t both appear in the same equation they must be expressed in the same units.]
| a | 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. |
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| 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 Xiis an individual measurement in a set of Nmeasurements and Xis 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. |