Detection of oxygenated compounds in automotive gasoline
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Our unit analyzes the oxygenated compounds in gasoline using the SH/T0663 method, and we find that the concentrations of various components are always higher than expected (compared to the theoretical values). Has anyone who has worked on this type of analysis encountered this issue? Could you help us figure out why this happens?
What instruments do you use for analysis?
Dual-path gas chromatograph, with split-backflow
The original poster had better verify the data carefully. If the heavier components are all somewhat larger, it may be due to the loss of light components during sampling, sample storage, and transfer. If it is only the oxide component that is high, then what is the basis for this increase? So how are the sample composition data that are not too skewed determined? Do you mean it’s on the larger side based on your own feeling, or is there evidence of changes in the data? Since gasoline is a mixture of lighter hydrocarbons, the relative lightness of these components directly affects the analysis results; moreover, careless handling during sample collection, storage, transfer, and even sampling can also impact the composition analysis. Low-boiling components are prone to volatilization and loss under the aforementioned conditions, which is a point that needs to be taken into account when analyzing gasoline.