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| CHROMDIS is a chromatographic data processing program for simulated distillation. This intuitive and easy to use software operates in a Windows 95/98 or NT environment. | |||||||||||||||
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INTRODUCTION
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| Simulated Distillation analysis is based on the fact that hydrocarbons are eluted from a non-polar or low-polar column in a specific boiling point order. The column is temperature programmed until all the hydrocarbons have been eluted. This is done by following any of the developed ASTM methods, such as ASTM D2887, D3710, D5307, and D6352. In addition IFP methods, or your own developed method can be used. Samples analyzed by a Simulated distillation method are integrated in fixed slices rather than the traditional individual peak identification. The time axis is converted to temperature by running a calibration standard under the same conditions as the sample. This calibration mixture usually consist of a range of normal paraffins whose boiling points are accurately known. A blank baseline signal is also established to determine the net signal of the sample. Using data from these three results(sample, calibration standard, and a blank) it is possible to calculate the percentage recovered at any temperature. CHROMDIS gives your lab the tools to easily master the simulated distillation process. | |||||||||||||||
| This table relates the retention times of the hydrocarbons to their respected boiling points. Abbreviated names or IUPAC names can be given to referenced hydrocarbons. To the right of the table a calibration curve is generated, this gives a visual perspective on the entered calibration data. Innumerable calibration curves can be created, saved, and edited at any time in C° or F°. CHROMDIS gives you the ability to use several different methods and columns on the same GC or multiple Gc’s. |
The header and footer can be edited to include any desired text at the beginning or end of the report. In the main statements screen the user selects the elements to be printed in the report, a parameter can be added in the value column if needed. Section and subsection numbers can be added before the titles you entered in the Main part. |
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| Boundaries: Two ways exist to determine the start and end of sample elution: User selected or by a defined ASTM algorithm. Validation test: Are performed on a) the first slices stability, b) negative slices that are annulled, up to a defined threshold, c) the offset between the blank and the sample. d) Moreover the drift of the blank is also tested and should not overcome a defined value. Cut Points: The cut points in this table specify the temperatures which correspond to sample elution percentages you want calculated. | |||||||||||||||
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Dernière mise à jour le Mardi 26 Décembre 2000 Copyright © 2001Gecil Process, All Rights Reserved
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