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1.For the samples£¬ the whole of the ²»»Ó·¢ÑÎ was retained by aSample Textlocated between the injector and the chromatographic column. In this way, the result of the analysis was not affected by the presence of ÑÎ, as we were able to verify experimentally.The trap was periodically cleaned to prevent the IL from coming into the column.
2.The amount of ÑÎ could not be analyzed via gas chromatography, because of the negligible vapor pressure of ÑÎ; The ÑÎ was collected in a precolumn (cup linear), to avoid contamination of the analytical column.

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