| OELCHECK test instrument: | Gaschromatograph Clarus 600 by PerkinElmer Anton Paar density meter DMA 4501 and sample changer |
| Sample quantity: | 18 ml |
| Unit: | - |
| Test result: | cetane index |
| Analysis for: | diesel fuels |
| Brief description: | Chromatographic procedures are used to break complex mixtures of substances down into their components. In gas chromatography, the mixture for investigation is injected into a narrow capillary column using an injector. The column is placed in a thermally adjustable oven. Hydrogen, as a carrier gas, is flowed through it continously. If the sample enters the column, it evaporates and the individual components are flushed through the column in gaseous form by the carrier gas. Depending on their structure and the temperature in the oven chamber, the individual components remain on the surface of the column for different lengths of time. They are therefore broken down based on their boiling temperature. As the individual components leave the column, a detector identifies them. It records them in a chromatogram. The later a component is detected at the column outlet, the higher its boiling point. The area under a peak in the chromatogram is proportionate to the amount of the component in the mixture. |
| Statement: | The cetane index describes the ignitability of diesel fuels.The index is calculated from the density and the boiling curve using the so-called 4-parameter equation. |
| Underlying test standard: | DIN EN ISO 3924, DIN 51435, ASTM D2887, DIN EN ISO 4264, DIN EN ISO 12185 |
