An Inexpensive Detector for Gas Chromatography
| Autor: | Wolfgang Nadler, Edward J. Thorne, Allan L. Smith |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Journal of Chemical Education. 75:1129 |
| ISSN: | 1938-1328 0021-9584 |
| DOI: | 10.1021/ed075p1129 |
| Popis: | We have developed a low-cost (parts cost approximately $70) detector that can be used in a freshman level class to demonstrate the fundamental principles of gas chromatography (GC). The detector box can be used in a modification of experiments available in the literature which do not enable a quantitative method of analysis. We have used it with success in a freshman class of approximately 450 students in an experiment to separate chlorinated hydrocarbons via GC. Natural gas is used as the carrier gas, a commercial GC column packing is the separating medium, and a Beilstein detector generates a green flame when the halocarbon is burned as it exits the column. The detector box is equipped with a CdS detector selective for the green light emitted and gives a signal that is quantitatively measured by an appropriate means such as a strip chart recorder or computer interfaced terminal panel.The detector box has a limit of detection on the order of 0.5 to 5 mg and shows a linear response over a sixfold change i... |
| Databáze: | OpenAIRE |
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